BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS

A Ampere ACCUM Accumulator

A Amber ACCY Accessory
A Area ACDB Airport Characteristics Data Bank
A Alternate ACDO Air Carrier District Office
A Altitude ACE Altimeter Control Equipment
A Air ACE Air Cargo Equipment
A Angstrom ACE Actuator Control Electronics
A A Check (MD) ACEM Aircraft Equipment Modification
AA Arithmetical Average ACESS Advanced Cabin Entertainment Service System
AA Autopilot Annunciator ACFI Advisory Committee on Flight Information (FAA)
AAAS Alternative Audio Alert Select ACFT Aircraft
AAC Airline Administration Communications (787) ACIA Asynchronous Communications Interface Adaptor
AACD Aging Airplane Corrosion Document ACIC Aeronautical Chart and Information Center
AACP Aging Airplane Corrosion Program AC-ID Aircraft Identifier (787)
AACU Antiskid/Autobrake Control Unit ACK Acknowledge, Acknowledgment
AADF Angle of Attack Averaging Defeat ACLOR Aileron Command Limit Override
AADS Analog Air Data System ACLS Altitude Capture Level Switch
AAI Air-to-Air Identification ACM Air Cycle Machine
AAIB Air Accidents Investigation Branch ACM Aileron Centering Mechanism
AAIP Analog Autopilot Improvement Program ACMF Airplane Condition Monitoring Function
AAL Above Aerodrome Level ACMP Alternating Current Motor Pump
AALS Altitude Acquire Level Switch ACMS Aircraft Condition Monitoring System
AAM Autopilot Actuator Monitor ACMS Airplane Condition Monitoring System
AAS Airport Advisory Service ACN Aircraft Classification Number
A-ATCK Angle of Attack ACO Aircraft Certification Office (FAA)
AATF Airworthiness Assurance Task Force ACOB Automatic Call Out Box
AAU Audio Accessory Unit ACOC Air Cooled Oil Cooler
AAWG Airworthiness Assurance Working Group ACP Audio Control Panel
AB All Base ACP Altimeter Check Point
A/B Autobrake ACQ Acquire, Acquisition
ABBR Abbreviation ACQN Acquisition
ABM Abeam ACRU Avionics Cooling Refrigeration Unit
ABN Airborne ACS Air Conditioning System
ABNORM Abnormal ACS Access
ABS Autobrake System ACS Active Control System
ABS Absolute ACS Airplane Configuration System
ABSCU Auto Brake System Control Unit ACS ACESS Configuration System
ABSORB Absorber ACS AFDX Cabinet Switch
ABSV Alternate Brake Selector Valve ACSU Advanced Central Switching Unit
ABS VAL Absolute Value ACT Active
ABU Audio Balancing Unit ACT Activity
ABU Auto Break Unit (MD) ACT Actual
ABV Above ACT Actuator
AC Alternating Current ACTD Actuated
AC Aircraft ACTG Actuating
AC Altitude Capture ACTN Action
AC Automated Customized ACTR Actuator
AC Advisory Circular (FAA) ACTVT Activate
A/C Aircraft ACU Antenna Coupler Unit
A/C Air Conditioning ACU Acceleration Control Unit
A*C Aircraft ACU Annunciator Control Unit
ACARS Arinc Communications, Addressing & ACU Auxiliary Control Unit
Reporting System ACU Antenna Control Unit (787)
ACARS Aircraft Communications, Addressing & ACV Altitude Capture Validity
Reporting System (MD) ACVR Alternating Current Voltage Ratio
ACAS Airborne Collision Avoidance System (787) AD Airworthiness Directive (FAA)
ACAU Air Conditioning Accessory Unit AD Aerodrome
ACB Airplane Configuration Bulletin AD Airplane Datum
ACC Accessory A/D Analog-to-Digital
ACC Accelerometer A/D Analog to Digital Converter (MD)
ACC Area Control Center ADAMS Airborne Data Analysis and Monitor System
ACC Active Clearance Control ADAS Auxiliary Data Acquisition System
ACC Air Conditioning Controller (MD) ADAU Auxiliary Data Acquisition Unit
ACCEL Accelerate, Acceleration ADB Audio Distribution Box (787)
ACCEL Accelerometer ADB Area Distribution Box (787)
ACCESS Accessory ADC Air Data Computer
ACCLRM Accelerometer A/DC Analog to Digital Converter
ACCU Accumulator ADCN Advanced Drawing Change Notice

1 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
A/D CONV Analog to Digital Converter Information
ADD Addition AFOLTS Automatic Fire Overheat Logic Test System
ADF Automatic Direction Finder AFP Advanced Fiber Placement (787)
ADG Air Driven Generator AFQGS Advanced Fuel Quantity Gauging System
ADI Attitude Director Indicator AFR Airframe
ADIF ADI Flag Inhibit AFS Autoflight System
ADIRS Air Data Inertial Reference System AFS Aging Fleet Survey
ADIRU Air Data Inertial Reference Unit AFSC Ancillary Fuel System Controller
ADIS Automatic Data Interchange System AFT Aftward
ADJ Adjust, Adjustable, Adjustment AFT After
ADJMT Adjustment AFTN Aeronautical Fixed Telecommunication Netword
ADL Airborne Data Loader AFTR After
ADL Allowable Damage Limit (787) AG Approach Gate
ADM Air Data Module A/G Air/Ground
ADMS Airborne Data Monitoring System AGB Accessory Gearbox
ADP Air Driven Pump AGC Automatic Gain Control
ADP Automatic Data Processing AGCA Automatic Ground Controlled Approach (MD)
ADPTN Adaptation AGCL Automatic Ground Controoled Landing (MD)
ADPTR Adapter AGCU Auxiliary Generator Control Unit
ADR Advisory Route AGIS Air/Ground Indication System
ADRS Address AGL Air to Ground Level
ADS Air Data System AGL Above Ground Level
ADS Audio Distribution System AGMT Augment
ADS Automatic Dependent Surveillance (787) AGR Auxiliary Generator Relay
ADU Align Display Unit AGS Automatic Ground Spoilers
ADU Air Drive Unit AGS Air/Ground System
ADU Antenna Drive Unit (787) AGSB Auto Ground Speed Brake
ADV Advisory AGSS Air/Ground Safety Sensor
AEA Association of European Airlines AGT Agent
AEB Airline Engineering Bulletin AGU Audio Gateway Unit (787)
AEEA Aft Electronics Equipment Area AGW Actual Gross Weight
AEEC Airlines Electronic Engineering Committee AH Alert Height
AEG Aircraft Evaluation Group (FAA) AH Ampere Hour
AEIV Alternate Extension Isolation Valve (787) AHE Altitude Hold Engaged
AEM Audio Entertainment Multiplexer AHG Altitude Hold Good
AEP Audio Entertainment Player AHM Airplane Health Manager (787)
AERNO Aeronautical Equipment Reference Number AHP Anti Hijacking Panel
AERO Aerodynamic AHRS Attitude Heading Reference System
AERODYN Aerodynamic AHRU Attitude and Heading Reference Unit
AES Aircraft Earth Station AHS Altitude Hold Selected
AESC Aft Electronic Service Center AHV Add Heat Valve (787)
AEW Airborne Early Warning AI Anti-Icing
AEX Access Authorized AI Accuracy Index
AF Audio Frequency AI Analog Input
AF All Freighter A/I Anti-Ice
AF DME Arc to Fixed Waypoint AIA Aerospace Industry Association
AF Align Fader Switch Logic AIA American Institute of Aeronautics
AF Air Force Standards AIAA American Institute of Astronautics and
A/F Auto Flight Aeronautics
A/F Autofeather AICC Aviation Industry CBT Committee
AFB Antifriction Bearing AID Aircraft Installation Delay
AFC Automatic Frequency Control AIDS Aircraft Integrated Data System
AFC Automatic Flight Control AIG Accident Investigation
AFCR Air Flow Control Regulation AIL Aileron
AFCS Automatic Flight Control System AILAS Automatic Instrument Landing Approach System (MD)
AFCS Avionic Flight Control System AILS Automatic Instrument Landing System (MD)
AFD Automatic Flight Director AIM Action Item-Miscellaneous
AFD Adaptive Flight Display Unit (787) AIM Acknowledgement, ISO alphabet numbers and
AFDC Autopilot Flight Director Computer Maintenance
AFDS Autopilot/Flight Director System AIMS Airplane Information Management System
AFDX Avionics Full Duplex Ethernet Switch (787) AIP Aeronautical Information Publication
AFF Autoflight Function (787) AIR Airplane Airborne
AFL Air Flow AIR COND Air Conditioning
AFL Aileron Force Limiter AIRGND Air/Ground
AFM Airplane Flight Manual AIR/GRD Air/Ground
AFM Approved Flight Manual AIRS Airline Inventory Redistribution System
AFMC Advanced Flight Management Computer AIRSPD Airspeed
AFM-DPI Airplane Flight Manual-Digital Performance AIS Aeronautical Information Service

2 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
AISI American Iron and Steel Institute AMS Aeronautical Material Specifications
AITI Area Inspection Task Items AMS Aerospace Material Specification
AIV Accumulator Isolation Valve AMS American Material Specifications
AJ Assembly Jig AMT Amount
AL Alumel AMTI Airborne Moving Target Indicator
AL Autoland AMTOSS Aircraft Maintenance Task Oriented Support
Al Aluminum System
A/L Approach/Land AMU Audio Management Unit
A/L Autoland AMUX Audio Multiplexer
ALC Automatic Load Control AN Air Navigation
ALCMD Autoland Command AN Normal Acceleration
ALCS Autopilot Lateral Control Servo AN Army-Navy Standard
ALDB Airline Database AN Air Force-Navy Aeronautical Standards
ALERFA Alert Phase A/N Autonetics
ALI Airworthiness Limitation Instructions (MD) ANAL Analysis
ALICS Airline Inventory Control System ANAV Automated Navigation
ALIGN Alignment ANCDU Alternate Navigation Control Display Unit
ALIM Align Mode ANCPT Anticipate
ALM Alarm ANCPTR Anticipator
ALN Align AND Aircraft Nose Down
ALPHA Angle of Attack ANG Angle
ALPHA Minimum Speed Control Mode ANLG Analogic
ALPHANUM Alphanumerical ANN Annunciator
ALR Alert ANNCT Announcement
ALS Aft Limit Switch ANN LT Annunciator Light
ALS Approach Light System ANNUN Annunciator
ALS Aircraft Landing Systems ANNUNC Annunciator
ALT Altitude ANPT Aeronautical National Taper Pipe Threads
ALT Altimeter ANPT American National Pipe Thread
ALT Alternate ANS Alternate Navigation System
ALT ACQ Altitude Acquire ANS Ambient Noise Sensors
ALT A/P Alternate Autopilot ANSI American National Standards Institute
ALT CAP Altitude Capture ANT Antenna
ALT CAPT Altitude Capture ANTI-COLL Anti-Collision
ALT HOLD Altitude Hold ANU Aircraft Nose Up
ALTM Altimeter AO Access Opening
ALTN Alternate AOA Angle Of Attack
ALTNT Alternate AOA Angle Of Airflow
ALTNR Alternator (MD) AOAS Angle Of Attack Sensor
ALTNTR Alternator (MD) AOB All Overseas Base
ALTRK Approach Land Track AOC Approach On Course
ALT SEL Altitude Select AOC Air Oil Cooling
ALT-T Altitude Trip (Takeoff, GA) AOC Airline Operational Control (787)
ALT TO Alternate To AOE Automatic Overwing Exit
ALU Arithmetic and Logic Unit AOG Aircraft On Ground
ALV Autoland Validity AOL All Operators Letters
AM Amplitude Modulation AOM Aircraft Operating Manual
Am Amercium AOVP Aft Overhead Panel (MD)
AMB Ambient AOX Air/Oil Cooler
AMB Amber AP Autopilot
AMB Aircraft Maintenance Base AP Airborne Printer
AMC Acceptable Means of Compliance AP Airport
AMETS Airplane Maintenance Engineered Time AP Auxiliary Power
Standards A/P Autopilot
AMI Airplane Modifiable Information A/P Airplane
AMLCD Active Matrix Liquid Crystal Display A&P Airframe and Powerplant
AMM Ammeter APB Auxiliary Power Breaker
AMM Aircraft Maintenance Manual APB APU Breaker
AMOC Alternate Means of Compliance (FAA) APB Aft Pressure Bulkhead (MD)
AMP Amperes, Amperage APC Auxiliary Power Unit (MD)
AMP Amplifier APC Automatic Phase Control (MD)
AMP Area Microphone & Preamplifier (787) APCH Approach
AMP HR Ampere-Hour APCMD Autopilot Command
AMPL Amplifier APCS Autopilot Pitch Control Servo
AMPL Amplitude APCU Auxiliary Power Control Unit
AMPU Aircraft Modular Power Unit APD Approach Progress Display
AMRE Airplane Maintenance and Repair Engineering APE Autopilot Engaged
AMRN Advance Modification Revision Notice AP/FD Autopilot/Flight Director

3 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
APFDS Autopilot Flight Director System ARU Altitude Rate Unit
APFE Autopilot First Engaged AS Altitude Select
API Angle Position Indicator AS Airspeed
API Air Position Indicator AS Airscoop
API Application Program Interface (787) AS Aerospace Standards
APID Airplane Identification A/S Airspeed
APL Airplane A/S Antiskid
APL Assembly Parts Lists A/S Auto Stabilization
APM Airplane Performance Monitoring ASA Autoland Status Annunciator
APM Aircraft Personality Module (787) ASA All Speed Aileron
APNFF Autopilot No First Failure ASAE Altitude Select Arm Engaged
APP Approach ASAERST Altitude Select Arm Engaged Reset
APP Appearance ASAP As Soon As Possible
APPC Approach Control ASAS Airborne Separation Assurance System
APPD Approach Disconnect ASAS Altitude Select Arm Selected
APPD Approved ASAS Abnormal Start Advisory System
APPE Approach Engage ASAT Automated Spar Assembly Tool
APPLE Approach Land Engaged ASC Automatic Sensitivity Control
APPR Approach ASC Aural Synthesizer Card
APPROX Approximately ASCD Ascend
APR Approach ASCII American Standard Code for Information
APR Automatic Performance Reserve Interchange
APR Auxiliary Power Relay ASCP Air System Control Panel (MD)
APRCH Approach ASCPC Air Supply and Cabin Pressure Controller
APRT Airport ASCS Air Supply Control System
APS Aircraft Prepared for Service ASCTU Air Supply Control and Test Unit
APS Auxiliary Power Supply ASCU Anti Skid Control Unit
APS APU Power Switch ASD Accelerate Stop Distance
APS Air Purification System (787) ASE Airborne Support Equipment
APS Auxiliary Power System (787) ASE Airspeed Error
APSE Autopilot Servo Engaged ASE Airline Support Engineer
APT Airport ASE Auto Slat Extend
APU Auxiliary Power Unit ASF Amperes per Square Foot
APUC Auxiliary Power Unit Controller ASG ARINC Signal Gateway
APUC APU Cnange (MD) ASG APU Starter Generator
APUCU APU Control Unit ASG Auxiliary Starter Generator (787)
APUCP APU Control Panel (MD) ASI Airspeed Indicator
APUHR APU Operationg Hours (MD) ASI Air Safety Investigation
APUIC APU Interface Card ASIT Airplane and Services Integration Team
AQS Advanced Quality System A/SKID Anti Skid
AR As Required ASM American Society for Metals
AR Approved Repairs ASM Airspeed Mode
A/R Altitude Rate ASM Autothrottle Servo Motor
A&R Assembly and Repair ASM Air Separation Module (787)
ARAC Aviation Rule-making Advisory Committee ASM Application Specific Module (787)
ARB Air Registration Board AS/M Airspeed/Mach
ARC Automatic Rollout Control ASME American Society of Mechanical Engineers
ARGS Autopilot Rollout Guidance Servo ASN Assigned System Number
ARINC Aeronautical Radio Incorporated ASN Airplane Serial Number
ARINC STP ARINC I/O UART data Strip ASP Audio Selector Panel
ARMD Armed ASP Altitude Select Panel
ARMG Arming ASP Aspirated (tat probe)
ARND Around ASP Attendant Switch Panel (787)
ARO After Receipt Order ASP Area Switch Panel (787)
ARP Aerodrome Reference Point ASPD Airspeed
ARP Airport Reference Point ASR Airport Surveillance Radar
ARP Aeronautical Recommended Practices ASS Auxiliary Spar Station
ARPT Airport ASSEM Assemble
ARR Arrival, Arriving ASSY Assembly
ARRA Arizona Radiation Regulatory Agency AST Automatic Stabilizer Trim
ARS AFDX Remote Switch A/STAB Auto Stabilizer
ARSR Arrestor ASTM American Society for Testing and Materials
ART Active Repair Time ASTP Automatic Stabilizer Trim Potentiometer
ART Auto Reserve Thrust ASTU Automatic Stabilizer Trim Unit
ARTCC Air Route Traffic Control Center ASU Attendant Service Unit
ARTCLD Articulated ASU APU Starter Generator
ARTF Artificial ASWC Advanced Stall Warning Card
ARTS Aircraft Recovery Transportation System ASYM Asymmetry

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 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
ASYM Asymmetric, Asymmetrical AUT Automatic
AT Autothrottle AUTH Authorize, Authority
A/T Autothrottle AUTO Automatic
A/T Adjustment/Test AUTOCAL Autocalibration
A&T Assembly and Test AUTODADS Automatic Digital Air Data Computer Selection
ATA Air Transport Association AUTOLAND Automatic Landing
ATA Actual Time of Arrival AUW All-Up Weight
ATB Air Turn Back AUX Auxiliary
ATC Air Traffic Control AV Average
ATC Accelerometer Test Complete AV Altitude Hold Validity
ATCH Attach, Attachment AVAIL Available
ATCK Attack AVC Automatic Volume Control
ATCN Advance Tool Change Notice AVC Audio Video Controller (787)
ATCRB Air Traffic Control Radar Beacon AVG Average
ATCRBS Air Traffic Control Radar Beacon System AVIONICS Aviation Electronics
ATCSS Air Traffic Control Data Link Signaling System AVM Airborne Vibration Monitor
ATCT Air Traffic Control Tower AVN Aviation
ATE Automatic Test Equipment AVNCS Avionics
ATE Automated Test Equipment AVPAC Aviation VHF Packet Communications
ATE Auto Throttle Engaged AVRS Audio/Video Recording System
ATEC Automatic Test Equipment Complex AVS Audio Visual System
AT ENG Auto Throttle Engaged AVS Alternate Ventilation System (787)
A/THR Automatic Thrust AVSAT Aviation Satellite
ATI Advanced Technology Interior AVT Audio Visual Training
ATI Auto Throttle Inhibit AVT Audio Visual Tutorial
ATIS Air Terminal Information Service AWACS Airborne Warning And Control System
ATIS Automatic Terminal Information Service AWB Air Way Bill
ATLAS Abbreviated Test Language for Avionics Systems AWG American Wire Gauge
ATM Air Turbine Motor AWG Audible Warning Generator
ATM Available Ton-Mile AWLS All Weather Landing System
ATM Atmosphere AWN Airworthiness Notice
ATM Air Traffic Management (787) AWOS Automatic Weather Observing System
ATMS Advanced Text Management System AWS American Welding Society
ATN Aeronautical Telecommunications Network (787) AWU Aural Warning Unit
ATOR Auto Throttle Override AWY Airway
ATP Alert Transponder Panel (787) AX Access Authorized
ATR Austin-Trumbull-Radioracking AX Longitudinal Acceleration
ATR Automatic Thrust Restoration A/XFMR Autotransformer
ATR Auto Tune Radio AY Lateral Acceleration
ATR Auto Transformer Rectifier (787) AY Assembly
ATRU Auto Transformer Rectifier Unit (787) AZ Azimuth
ATRUC Auto Transformer Rectifier Unit Contactor (787) AZ Vertical Acceleration
ATS Auto-Throttle System AZFW Actual Zero Fuel Weight
ATS Auto Throttle Servo
ATS Automatic Test Station
ATS ACESS Test System
ATS Air Traffic Services (787)
ATSCV Air Turbine Starter Control Valve
ATSD Auto Throttle Servo Disconnect
ATSEL Altitude Select
ATT Attitude
ATT Flight Attendant
ATTC Automatic Takeoff Thrust Control
ATTD Attitude
ATTEN Attenuation, Attenuator
ATTEND Attendant
ATTF Attitude Flag
ATTN Flight Attendant
ATTN Attention
ATTND Flight Attendant
ATT REF Attitude Reference
ATU Auto Transformer Unit (787)
ATUC Auto Transformer Unit Contactor (787)
ATV Auto Trim Valid
ATZ Aerodrome Traffic Zone
AUD Audio
AUD Audible
AUG Augment, Augmentation

5 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
B Blue BET Boeing Equivalent Thrust (787)
B Both BETA Sideslip Suppression System
BA Bundle Assembly BETA Angle of Sideslip
BA Balance Arms BETW Between
B/A Bank Angle BEV Bevel
BAC Boeing Standards BEW Basic Empty Weight
BAC Boeing Airplane Company BFDAS Basic Flight Data Acquisition System
BACD Boeing Design Detail BFE Buyer Furnished Equipment
BACS Bleed Air Control System BFO Beat Frequency Oscillator
BAF Baffle BFR Buffer
BAL Balance BFR Before
BAL Basic Assembly Language BFS Boeing Field Service
BALTI Inertial Barometric Altitude BG Body Gear
BAP Bank Angle Protection BG Build Group
BAR Barometric, Barometer BGC Build Group Component
BAR Barometric Altitude Rate BGM Boarding Music
BAR Bleed Air Regulator BGS Build Group Stack-up
BARC Barometric Altitude Rate Computer BGW Basic Gross Weight
BARF Barometric Altitude Rate Flag BH Brinell Hardness
BARO Barometric BHD Bulkhead
BAT Battery BHE Bank Hold Mode Engaged
BATT Battery BHN Brinell Hardness Number
BAV Bleed Air Valve BHP Brake Horsepower
BB Bar Bias BHP-HR Brake Horsepower Hour
BB Broad Band BIFI Bifurcation
BB Ball Bearing BIFUR Bifurcation
B/B Back Beam BIST Built in Self Test
BBL Body Buttock Line BIT Built-In-Test
BBRG Ball Bearing BITE Built-In-Test-Equipment
BC Back Course BK Brake
BC Baggage Container BK Black
BC Battery Charger (787) BK Book
BCA Boeing Commercial Airplanes BKGD Background
BCAA British Civil Aviation Authority BKGRD Background
BCAG Boeing Commercial Airplane Group BKR Breaker
BCAR British Civil Airworthiness Requirements BL Buttock Line
BCAS Beacon Collision Avoidance BL Bleed
BCD Binary Coded Decimal BL Brake Lever
BCD` Bulk Cargo Door (787) B/L Blue Line
BCF Bromochlorodifluoromethane BLC Boundary Layer Control
BCK Back BLD Bleed
BCLM Baggage/Cargo Loading Manual BLDG Building
BCN Beacon BLG Body Landing Gear
BCR BOECOM Change Report BLK Black
BCRS Backcourse BLKHD Bulkhead
B/CRS Backcourse BLKT Blanket
BCS Block Check Sequence BL-L Buttock Line Left
BCS Boeing Computer Services BL-R Buttock Line Right
BCSM Boeing Customer Services Manager BLO Buttock Line Zero
BCSR Boeing Customer Services Representative BLO Below
BCU Bus Control Unit BLO Blower
BCU Battery Control Unit BLS Bezel Light Sensor
BCU Brake Control Unit BLSA Beam Level Switch A
BCV Bore Cooling Valves BLSB Beam Level Switch B
BD Beginning of Descent BLST Ballast
BD Board BLT Bolt
B/D Bottom of Descent BLU Blue
B/D Bearing/Distance BLV Bleed Valve
BDA Backdrive Actuator (787) BLW Below
BDE Buyer Designated Equipment (MD) BM Beam
BDL Bundle BM Back Course Marker
BDS Boeing Design Standard BM Bulk Material
BDY BLK Burndy Block BMEP Brake Mean Effective Pressure
Be Baume BMI Bismaleimide (787)
BED Beam Error Detector (glideslope) BMS Boeing Material Specification
BEL CRK Bellcrank BMS Boeing Material Standard
BEM Basic Empty Weight (MD) BMT Boeing Materials Technology
BER Beyond Economical Repair BMV Brake Metering Valve

6 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
BND Bonded BTMS Brake Temperature Monitor System (787)
BNDG Bonding BTMU Brake Temperature Monitor Unit
BNDRY Boundary BTN Button
BNR Binary BTN Boeing Telecommunications Network
BNR Binary Numerical Reference BTR Bus Tie Relay
BNY Binary BTRY Battery
BO Blocking Oscillator BTS Boeing Technology Services
BOD Bottom Of Descent BTS Brake Temperature Sensor (MD)
BOECOM Boeing Communications BTU British Thermal Unit
BOH Break-Off Weight BTU Ball Transfer Unit (787)
BOLD Boeing On Line Data BU Battery Unit
BOSS Broadband Offboard Satellite System (787) BU Back Up
BOT Bottom
BOT Beginning Of Tape BUCCS Boeing Uniform Classification and Coding
B/OUT Breakout System
BOV Bar Out of View BUG Reference Marker (A/S or EPR)
BOV Biased Out of View BUT Button
BP Bandpass BUTE Bent Up Trailing Edge (MD)
BP Bottom Plug BVA Bleed Valve Actuator
BP Blueprint BVA Bleed Valve Angle
BP Baseline Program BVCU Bleed Valve Control Unit
BPCU Bus Power Control Unit BWL Body Water Line
BPI Brake Pressure Indicator BYP Bypass
BPI Boeing Process Instruction BZO Benzyl PeroxideC Common
BPP Bus Protection Panel
BPS Boeing Part Specifications
BR Buildup Relay
BR Brown
BRC Brace
BRD Braid
BRD Boarding
BRDG Bridge
BRG Bearing
BRIL Brilliance
BRK Brake
BRKR Breaker
BRKRS Breakers
BRKS Brakes
BRKT Bracket
BRN Brown
BR&O Build Requirements & Operations (787)
BRP Body Reference Plane
BRT Bright, Brightness
BRZ Bronze
BS Body Station
BSB Buss Source Breaker (787)
BSC Basic
BSCU Brake System Control Unit
B/SEC Bits per Second
BSHG Bushing
BSOPM Boeing Standard Overhaul Practices Manual
BSS Boeing Support Standard
BSSI Boeing Support Services International
BST Boost
BSTA Body Station
B STA Body Station
BSU Beam Steering Unit
BSV Burner Staging Valve
BSWPM Boeing Standard Wiring Practices Manual
BSY Busy
BT Bus Tie
BT Bogie (truck) Tilt
BTB Bus Tie Breaker
BTBS Bus Tie Breakers
BTC Bus Transfer Contactor
BTL Bottle
BTLCS Brake Torque Limiting Control System
BTM Brake Temperature Monitor (MD)

7 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
C Centigrade, Celsius (degrees) CAS Computed Air Speed
C Center CAS Calibrated Air Speed
C Cold CAS Calculated Air Speed
C Clear CAS Collision Avoidance System
C Close CAS Customer Assembled Spare
C Captain CASS Casserole
C Convertible CASV Computed Airspeed Validity
C Cyan CAT Category
C Comparator CAT Clear Air Turbulence
C Capacitor CATS Computer Aided Training System
C C Check (MD) CATIA Computer-Aided Three-dimensional Interactive
CA Cable Applications
CAA Civil Aviation Authority CAU Circular Area Units
CAA Civil Airworthiness Administration CAUT Caution
CAB Cabin CAWC Central Aural Warning Computer
CAB Civil Aeronautics Board CAWP Caution And Warning Panel
CAB PRESS Cabin Pressurization CAWS Central Aural Warning System (MD)
CAC Caution Advisory Computer CAWU Central Aural Warning Unit
CAC Center Accessory Compartment CAY Comparator Lateral Accelerometer
CAC Cabin Air Compressor (787) CB Circuit Breaker
CAC Controller Air Cooler (787) C/B Circuit Breaker
CACC Cargo Air Conditioning Card CBAL Counterbalance
CACP Cabin Area Control Panel CBIC Circuit Breaker Indication and Control (787)
CACTCS Cabin Air Conditioning and Temperature CBIT Continuous Built-In-Test
Control System CBM Check Balance Moment
CACV Condition Air Check Valve CBMS Circuit Breaker Monitoring System
CAD Computer Aided Design CBO Cycles Between Overhaul
CAD Central Air Data CBORE Counterbore
CAD Cadmium CBP Compressor Bleed Pressure
CADC Central Air Data Computer CBP Circuit Breaker Panel (MD)
CADS Central Air Data System CBR California Bearing Ratio
CAE Computer Aided Engineering CBS Circuit Breakers
CAF Coarse Alpha Fail CBS Cutback Stator
CAGE Commercial And Government Entity CBSV Cycles Between Scheduled Visits
CAH Cabin Attendant Handset CBT Computer Based Training
CAI Combustion Area Inspection CBT Circuit Breaker Panel
CAI Cabin Altitude Indicator CC Compass Coupler
CAL Calibrate, Calibration CC Combustion Case
CAL Comparator Autoland CC Cubic Centimeter
CAL Comparator Aileron CC Color Code (MD)
CALC Calculate CCA Central Control Actuator
CALC Cargo Acceptance and Load Control CCA Circuit Card Assembly
CALIB Calibrator CCB Converter Circuit Breaker
CALSEL Call Select CCC Crash Crew Cart
CAM Camera CCC Compressor Clearance Control
CAM Computer Aided Manufacturing CCC Core Compartment Cooling (787)
CAM Crew Alertness Monitor CCCV Core Compartment Cooling Valve
CAN Canopy CCD Comparator Course Data
CAN Comparator Accelerometer CCD Cursor Control Device
CAN Controller Area Network (787) CCDL Cross Channel Data Link
CANC Cancel, Cancelled CCG Customer Configuration Guide
Cant Canted (MD) CCIO Central Customer Information Organization
CANTIL Cantilever CCL Cargo Control Logic
CAO Cargo Aircraft Only CCM Cargo Control Module
CAP Capture CCQ Crew Cross Qualification
CAP Capacitor CCR Credit Card Reader
CAP Capacity CCR Common Computing Resource (787)
CAP Cap and Stow CCRC Common Computing Resource Cabinet (787)
CAP Cabin Attendant Panel (787) CCRM Cabin Crew Rest Module (MD)
CAPLTY Capability CCS Cabin Configuration System
CAPRI Controlled Atmospheric Pressure Resin Infusion (787) CCS Common Core System (787)
CAPT Captain CCSD Configuration Change Support Data
CAR Cargo CCTM Cabin Configuration Test Module
CAR Computer Aided Recertification CCU Cargo Control Unit
CAR Civil Air Regulation CCU Cabin Control Unit
CARB Carburetor (MD) CCV Customized Chapters Volume
CARP Carpet CCW Counter Clockwise
CARR Carrier CCW Curtailment Check Weight

8 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
CCWS Comparator Control Wheel Steering CG Centigram
CD Control Display CGF Color Guard Fabric
CD Case Drain CGG Cool Gas Generator
CD Cold Drawn CGM Computer Graphics Metafile
CD Count Drag CGO Cargo
C/D Case Drain CGS Centimeter-Gram-Second
CDB Configuration Database CH Channel
CDC Cyclic Redundancy Code CH Chromel
CDE Consumption Data Exchange Card CH Center Hatrack
CDG Configuration Database Generator CH Charge
CDI Course Deviation Indicator CH* Comparator Vertical Rate
CDL Configuration Deviation List CH-A Channel A
CDL Configuration Data Loader CHAM Chamfer
CD MON Course Datum Monitor CHAN Channel
CDN Common Data Network (787) CHAP Chapter (MD)
CDP Compressor Discharge Pressure CHAR Character
CDP Control and Dim Panel (EFIS) CHAS Chassis
CDR Customer Data Requirement CHAV Compressor Heating Air Valve
CDS Cold Drawn Steel CH-B Channel B
CDS Common Display System CHEM Chemical
CDT Cabin Data Terminal CHG Charge
CDTI Cockpit Display of Traffic Information (787) CHG Change
CDU Control Display Unit CHGR Charger
CDU Center Drive Unit CHK Check
CDU Cockpit Display Unit CHK GWT Check Gross Weight
C/DU Control/Display Unit CHKPT Checkpoint
CDX Control Differential Transformer CHM Chime
CDX Controlled Differential Transformer CHMBR Chamber
C&EA Configuration & Engineering Analysis (787) CHNG Changer, Changeover
CEB Customer Engineering Bulletin CHNGS Changes
CEC Combi Exhaust Controller CHNL Channel
CEC Cabin Equipment Center (787) CHR Chronograph
CED Crew Escape Door (787) CHRGR Charger
CEGT Corrected EGT CHRO Chronometer
CEL Celestial CHRONO Chronometer
CENT Centrifugal CHS Cargo Handling System (787)
CERT Certify CI Cast Iron
CESM Commercial Engine Service Memorandum CI Course to an Intercept
CEU Converter Electronics Unit CI Cost Index
CEU Cargo Electronics Unit CI Cabin Interphone
CEV Clutch Electro Valve CIC Cabin Interphone Controller
CF Course to a Fixed Waypoint CIC Corrosion Inhibiting Compound
CF Control Wheel Force CIH Cabin Interphone Handset
CF Centrifugal Force CIM Continuous Image Microfilm
CF Checking Fixture (tool) CIP Cost Improvement Program
CF Cost Factor CIP Cartridge In Place
CFAIL Critical Failure CIP Cabin Interphone
CFD Comparator Flight Director CIPR Cubic Inches Per Revolution (787)
CFD Continuous Fire Detection CIPS CAC Inlet Ice Protection System (787)
CFD Comparator Faded Decrab CIR Circular
CFDS Centralized Fault Display System (MD) CIRC Circulate
CFDIU Central Fault Display Interface Unit CIRC Circumference
CFDU Continuous Fire Detection Unit CIS Cabin Interphone System
CFE Customer Furnished Equipment CIS Cycles In Service
CFH Cubic Feet per Hour CIS Crew Information Systems (787)
CFIT Controlled Flight Into Terrain (787) CIS-MS FSM Crew Information Systems - Maintenance
CFM Cubic Feet per Minute System File Server Module (787)
CFMI CFM International CISS Configurable Integrated Surveillance System (787)
CFP Cargo Fire Panel (MD) CIT Compressor Inlet Temperature
CFPT Computer Flight Plan Time CIT Captain Instrument Transfer (787)
CFR Code of Federal Regulations CIWS Central Instrument Warning System
CFRP Carbon Fiber Reinforced Plastic CK Check
CFRTP Carbon Fiber Reinforced Thermal Plastic (787) CKD Checked
CFS Cold Finished Steel CKPT Cockpit
CFS Cubic Feet per Second CKS Countersink
CFSS Cargo Fire Suppression System (787) CKT Circuit
CG Center of Gravity CKTS Circuits
C.G. Center of Gravity CL Climb

9 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
CL Center Line CMPS Computerized Maintenance Planning System
CL Close CMPS CPLRCompass Coupler
CL Center of Lift CMPTG Computing
CL Clip CMPTR Computer
CL Clutch CMR Certification Maintenance Requirement
CL Centiliter CMRB Condition Monitoring Review Board
C/L Check List CMRLR Cam Roller
C/L Center Line CMS Central Maintenance System
C/L Cumulative Line (position) CMS Cabin Management System
CLA Condition Lever Angle CMS Code Material Society
CLASS Classification CMSC Common Motor Start Controller (787)
CLB Climb CMT Cabin Management Terminal
CLCP Central Lateral Control Package CMU Central Management Unit
CLD Closed CMU Communication Management Unit (MD)
CLG Ceiling CN1 Corrected N1
CLG Cooling CN2 Corrected N2
CLG Center Landing Gear (MD) CNA Common Nozzle Assembly
CLK Clock CNC Computer Numerically Controlled (787)
CLN Colon CNCL Cancel (787)
CLNG Cooling CNCT Connect
CLNR Cleaner CNCTD Connected
CLOG Clogging CNCTN Connection
CLP Clamp CNCTR Connector
CLPR Clapper CNCTRC Concentric
CLQ Closed Loop Torque function CNCV Concave
CLR Clear CND Conduit
CLR Clearance (altitude) CNI Communications, Navigation, and
CLR ALT Clearance Altitude Identification
CLRD Cleared CNTL Control
CLS Cabin Lighting System CNTNR Container
CLS Cargo Loading System CNTOR Contactor
CLS Continuous Level Sensor CNTR Counter
CLSD Closed CNTRL Control
CLSG Closing CNX Cancelled
CLTM Component Location Training Manual CO Company
CLV Clevis CO Cut-Off
CM Centimeter CO Change Order
CM Crew Member C/O Change Over
CM Call Maintenance CO2 Carbon Dioxide
CM Collective Modification COAX Coaxial
CM Condition Monitoring COC Customer Originated Change
CM Continuous Monitor COCC Combustion Chamber Outer Case (JT8D)
CMA Comma COD Cash On Delivery
CMC Central Maintenance Computer COEF Coefficient
CMCF Central Maintenance Computing Function COF MKR Coffee Maker
CMCS Central Maintenance Computer System COHO Coherent Oscillator
CMD Command COL Column
CMDD Command Drive (solenoid hold) COLL Collision
CMDHS Command Hold Solenoid COM Common
CMDS Command Switch COM Camout Monitor
CMDU Cargo Maintenance Display Unit (787) COM Communication
CMEU Cabin Management Expansion Unit COMB Combined
CMF Communication Management Function (787) COMD Command
CMFLR Cam Follower COMM Communications
C-MIST Carbon-Machined Integral Shear Tie (787) COMM Common
CMM Component Maintenance Manual COMM Commutator
CMM Common Mode Monitor COMND Command
CMO Certification Management Office (FAA) COMND SP Command Speed
C-MOS Complementary Metal Oxide Semiconductor COMP Compass
CMP Customized Maintenance Program COMP Compartment
CMP Configuration, Maintenance, Procedures COMP Compressor
(document) COMP Computer
CMP Condition-Monitoring Program COMP Compare, Comparator
CMPLRY Complementary COMP Compensator
CMPNT Compartment COMPL Complete, Completed
CMPNT Component COMPR Compressor
CMPS Compass COMPT Compartment
CMPS Centimeters Per Second COMPTR Computer

10 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
COMSAT Communications Satellite CPM Crash Protected Memory (787)
COMPSN Compensation CPMU Cabin Passenger Management Unit
COMPT Compartment CPO Crew Performance Objectives
COMPTR Comparator CPRSR Compressor
COMTN Commutation CPS Cycles Per Second
CON Continuous CPSH Control Panel Solenoid High Side
CON Maximum Continuous Thrust CPT Capture
CON Control, Control Panel CPTC Corrosion Prevention Task Cards
CON Conversation CPU Central Processing Unit
COND Condition, Conditioning CQS Customer Quality Support
CONDTN Condition CR Cruise
CONDTR Conditioner CR Change Request
CONF Confidence, Confidential CR Crew
CONFG Configuration CR Cold Rolled
CONFIG Configuration CR Complete Revision
CONN Connect, Connection, Connector CRA Crew Rest Area
CONST Constant CRC Continuous Repetitive Chime
CONT Contour CRC Cyclic Redundancy Check
CONT Continue, Continued, Continuous CRDS Customer Requirements Distribution System
CONT Control CRE Corrosion-Resistant
CONT Contactor CRES Corrosion Resistant Steel
CONT Controller CRF Compressor Rear Frame
CONT PNL Control Panel CRG Carriage
CONTR Controller CRG Cargo
CONT WHL Control Wheel CRG RTN Carriage Return
CONV Converter, Conversion CRI Certification Review Item (JAA)
CONVERG Convergence CRIT Critical
COOL Cooling, Cooler CRK Crank
COOL Coolant CRKG Cranking
COORD Coordinate, Coordination CRL Collar
COPI Copilot CR MOLY Chrome Molybdenum
COR Corrector CRN Current Return Network (787)
CORCTD Corrected CRNGRPH Chronograph
CORR Correct, Correction CRO Comparator Rollout
CORR Corrugate, Corrugation CRPOS Crew Position
CORR Corrosion CRS Course
CO RTE Company Route CRS Cold Rolled Steel
COS Cosine CRSN Corrosion
COT Cotter CRSVR Crossover
COT Cotangent CRT Cathode Ray Tube
COV Cover CRT Complete Revision Telex
COWL Cowling CRT Critical
CP Control Panel CRTL Critical
CP Clock Pulse CRU Card Reader Unit
CP Comparator CRU Cargo Refrigeration Unit (787)
CP Center of Pressure CRZ Cruise
CP Candle Power CS Call Switch
CP Corrosion Prevention CS Centistokes
CP Core Partition CS Control Switch
C/P Cleaning/Painting CS Comparator Servo Monitor
CPA Closest Point of Approach CS Cabin Cleaner Steps
CPAM Cabin Pressure Acquisition Module (MD) CS Control Ship code (Sonic)
CPBE Crew Protective Breathing Equipment CS Carbon Steel (MD)
CPC Cabin Pressure Controller C/S Center Section
CPCP Corrosion Prevention and Control Program CSB Component Service Bulletin
CPCPS Corrosion Prevention and Control Programs CSC Cosecant
CPCS Cabin Pressure Control System CSCP Cabin System Control Panel
CPCU Cabin Pressure Control Unit CSD Constant Speed Drive
CPF Corrosion Prevention Fluid CSE Course Set Error
CPI Crash Position Indicator CSE Customer Support Engineering
CPL Couple CSEU Control Systems Electronic Unit
CPL Continuous Parameter Logging (787) CSI Cycles Since Installation
CPLD Coupled CSI Computer Software Index
CPLG Coupling CSK Countersink
CPLR Coupler CSKH Countersunk Head
CPM Corrosion Prevention Manual CSL Console
CPM Cycles Per Minute CSM Cabin System Module
CPM Core Processing Module CSM Cabin Service Module

11 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
CSM Command and Service Module CW Caution and Warning
CSM Computer Software Manual C/W Caution and Warning
CSMS Customer Services and Material Support C&W Caution and Warning
CSMU Cabin System Management Unit CWD Control Wheel Disconnect
CSN Catalog Sequence Number CWE Control Wheel Engaged
CSO Cycles Since Overhaul CWF Control Wheel Force
CSQ Quiet Climb System (FMC) CWG Cockpit Working Group
CSR Customer Service Representative CWLU Cabin Wireless LAN Unit
CSRM Computing Security Requirements Manual CWS Control Wheel Steering
CSS Channel Select Switch CWSD Control Wheel Steering Solenoid Drive
CSS Cabin Service System CWSHS Control Wheel Steering Hold Solenoid
CSSC Cabin Services System Controller (787) CWSS Control Wheel Steering Switch
CSTG Casting CWT Center Wing Tank
CSTR Constraint CWY Clearway
CSV Cycles Since Last Shop Visit CX Control Transmitter
CSU Central Switching Unit CXN Cancellation
CSU Cassette Storage Unit (MD) CY Calendar Year, Current Year
CT Control Transformer CYC Flight Regime Takeoff Through Landing (MD)
CT Current Transformer CYL Cylinder
CT Confidence Test CZU Cabin Zone Unit (787)
CT Center Tap
CT Center Tape
CT Cost
CT Comparator Throttles
C/T Common To
CTA Current Transformer Assembly
CTA Control Area
CTAI Cowl Thermal Anti-Ice
CTAS Comparator True Airspeed
CTC Cabin Temperature Controller
CTD Column Timer Decoder
CTD Cross Track Deviation
CTF Central Test Facilities
CTFOS Customer Training and Flight Operations Support
CTG Comparator Takeoff and Go Around
CTK Capacity Tonne Kilometre
CTL Control
CTLM Contoured Tape Laminating Machine (787)
CTL Central
CTM Cycle Time Monitor
CTM/POR Cycle Time Monitor/Power On Reset
CTN Caution
CTR Center
CTR Contour
CTR Control Zone
CTRD Centered
CTRL Control
CTS Contrast
CTS Clear To Send
CTSK Countersunk
CTU Cabin Telecommunications Unit
CTW Center Wing Tank
CTWT Counterweight
CU Computer Unit
CU Control Unit
CU Cubic
Cu Copper
CU FT Cubic Foot
CU IN Cubic Inch
CUM Cumulative
CUR Current
CUST Customer
CV Control Valve
CV Check Valve
CVR Cockpit Voice Recorder
CW Clockwise
CW Continuous Wave
CW Control Wheel

12 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
D Derated DDB Data Disconnect Bracket (787)
D Delayed DDG Dispatch Deviation Guide
D Diameter DDI Design Drawing Instruction
DA Drift Angle DDI Documentary Data Insert
DA Direct Access DDM Digital Data Module
DA Double Amplitude DDM Difference in Depth of Modulation
D/A Digital-to-Analog DDPG Dispatch Deviations Procedures Guide
D/A Digital to Analog Converter (MD) DDRMI Digital Distance and Radio Magnetic Indicator
DAA Digital Analog Adapter D/DT Differential of D-Mux Demultiplexer
DABS Discrete Address Beacon System DDU Deceleration Detector Unit
DAC D/A Converter D/E Decoder/Encoder
DAC Digital Audio Control DEC Decrease
DAC Double Annular Combustor DEC Declination
DAC Douglas Aircraft Company (MD) DEC Decimal
DADC Digital Air Data Computer DEC Decrement
DADS Digital Air Data System DECAL Decalcomania (MD)
DAES Digital Audio Entertainment System DECEL Deceleration, Decelerate
DANA Dual Autoland Not Available DECIS Decision
D APSE Delayed Autopilot Servo Engaged DECR Decrease
DAR Digital Aids Recorder DED Dedicated
DAR Designated Airworthiness Representative DED Dead Ended (shield)
DAS Directional Autopilot Servo DEDP Data Entry and Display Panel
DAS/STC Designated Alteration Station/ Supplemental DEF Definite, Definition
Type Certificate DEFDARS Digital Expandable Flight Data Acquisition and
DATR Digital Audio Tape Reproducer Recording System
DAV Drift Angle Valid DEFL Deflect, Deflection
DB Decibel DEG Degrees
DB Data Base DEG Degrade
DBL Data Base Loader DEG C Degree Celsius
DBL Double (MD) DEG F Degree Fahrenheit
DBLR Doubler DEL Delete, Deleted
DBM Decibels (referenced to a milliwatt) DEL Delay Message
DBT Design Build Team DEL Diagram Equipment List
DC Direct Current DEL BY Deleted By
DC Disposition Code DELE Delete
DC Descent DELTA P Differential Pressure
DC Diffuser Combustor DEM Demand
DCAF Display & Crew Alerting Function (787) DEMOD Demodulator
DCAS Digital Controlled Audio System DEMUX Demultiplexer
DCCS DC Current Sensors DE-MUX Demultiplexer
DCD Double Channel Duplex DEP Departure
DCD Decode, Decoder DEP Data Entry Panel
DCDC Delayed Comparator DC DEP Data Entry Plug
DCDR Decoder DEP Depressurize
DCGF Data Conversion Gateway Function DEP Damage Evaluation Process (787)
DCIR DC Isolation Relay DEP ARR Departure/Arrival
DCMF Data Communication Management Function DEP/ARR Departure/Arrival
DCMS Data Communication Management System DEPLD Deployed
DCN Drawing Change Notice DEPR Depressurize
DCNT Descent DEPRESS Depressurization
DCP Display Control Panel (787) DEPT Departure
DCPC Digital Cabin Pressure Controller DEPT Department
DCPCS Digital Cabin Pressure Control System DER Derating
DCPIU Direct Current Power Isolation Unit DER Designated Engineering Representative (FAA)
DCR Drawing Change Request DER I Derate 1
DCS Double Channel Simplex DER II Derate 2
DCS Designated Certification Specialist DES Descent
DCTU DC Tie Control Unit DEST Destination
DCU Digital Computer Unit DESTN Destination
DCU Dimmer Control Unit DET Detent
DCU Data Control Unit DET Detect, Detector, Detection
DCU Data Concentrator Unit (MD) DET Detached
DCV Directional Control Valve DET Detailed
DCVR Direct Current Voltage Ratio DETN Detection
DD Drift Down DETNT Detent
DD DME-DME DEU Display Electronics Unit
D/D Engine Out Drift Down Point DEU Densitometer Electronics Unit
DDA Digital Differential Accumulation DEV Deviation

13 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
DEVN Deviation DIU Digital Interface Unit
DEX Access Demanded DIV Division
DF Direction Finder DIV Diversion
DF Default DJ Drill Jig
DFA Delayed Flaps Approach DK Deck
DFCS Digital Flight Control System DL Data Link
DFDAC Digital Flight Data Acquisition Card D&L Down and Locked
DFDAF Digital Flight Data Acquisition Function DLA Delay
DFDAMU Digital Flight Data Acquisition/ Management DLC Direct Lift Control
Unit DLC ENG Direct Lift Control Engaged
DFDAS Digital Flight Data Acquisition System (MD) DLCNFF Direct Lift Control No First Fail
DFDAU Digital Flight Data Acquisition Unit DLCS Direct Lift Control Servo
DFDR Digital Flight Data Recorder DLCV Direct Lift Control Validity
DFFN Dribble Flow Fuel Nozzles DLD Dynamic Load Damper
DFGC Digital Flight Guidance Computer DLDB Data Link Data Block (787)
DFGCP Digital Flight Guidance Control Panel DLDR Data Loader
DFGS Digital Flight Guidance System (MD) DLE Drooped Leading Edge (MD)
DFR Digital Flight Recorder DLGF Data Load Gateway Function
DFR Defrosting DLNA Diplexer Low Noise Amplifier (787)
DFRS Digital Flight Recorder System DLODS Duct Leak and Overheat Detection System
DFT Drift DLR Datalink Recorder (787)
DFT Design Facility Tool DLS Data Load System
DG Directional Gyro DLU Data Loader Unit
DG Dedicated Generator DLW Design Landing Weight
DGA Data Gathering Application (787) DLY Delay
DGAC Direction Generale de L'Aviation Civile DMA Direct Memory Access
DGCU Dedicated Generator Control Unit DMA Detection Mechanism Assembly (787)
DGTL Digital DMB Dead Main Bus
DH Decision Height DMC Design Modification Committee
DI Data Input DMC Direct Maintenance Costs
DI De-icing DME Distance Measuring Equipment
DI Detailed Inspection (MD) DMEP Data Management Entry Panel
DIA Diameter DMM Data Memory Module
DIAG Diagonal DMP Display Management Processor
DIAG Diagram DMPR Damper
DIAPH Diaphragm DMR Dimmer
DIB Diiodobutane DMRS Direct Mode Rate Sensor (787)
DID Design and Implementation Drawing DMS Debris Monitoring System
DIFF Differential, Difference DMU Data Management Unit
DIG Digital DN Down
DIGT Digital DNA Does Not Apply
DIM Dimension DN/RT Down Right
DIM Dimming, Dimmer DNTK Downtrack
DIP Dual Inline Package DNTKFX Down Track Fix
DIPLXR Diplexer DO Data Output
DIR Direct, Director D&O Description and Operation
DIR Direction, Directional DOC Direct Operating Cost
DIR INTC Direct Intercept DOC Document
DIR TO Direct To DOC.DATA Documentary Data
DIS Display DOT Differential Oil Temperature
DIS Distance DOT Department of Transport
DIS Disagreement DOW Dry Operating Weight
DIS Discard DOZ Dozen
DISAG Disagree DP Differential Protection
DISC Disconnect, Disconnected DP Departure
DISCH Discharge, Discharged DP Differential Pressure
DISCONT Discontinued DP Display Partition
DISCR Discrete DPBC Double Pole Back Connected (MD)
DISCTN Disconnection DPCT Differential Protection Current Transformer
DISENG Disengage DPCU Digital Passenger Control Unit
DIS-IN Discrete Inputs DPDT Double Pole Double Throw
DISP Dispatch DPFC Double Pole Front Connected (MD)
DISPL Display DPI Differential Pressure Indicator
DISPL Displacement DPI Delta Pressure Indicator
DISRMD Disarmed DPI Digital Performance Information
DIST Distance DPL Detailed Parts List
DISTR Distribution DPR Differential Protection Relay
DITS Digital Information Transfer System DPR Dual Pressure Rated

14 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
DPRR Discretionary PRR DWL Diagram Wire List
DPSK Differential Phase Shift Keying (MD) DX Access Demanded
DPST Double Pole Single Throw DYB Dynamic Braking
DPV Directional Pilot Valve DYN Dynamic
DPV Dual Purpose Valve DYNM Dynamotor
DR Door DYNMTC Dynamometric
DR Dead Reckoning
DR Drive
DR Drain
D/R Dead Reckoning
DRAM Dynamic Random Access Memory
DRATE Derate
DRMI Distance Radio Magnetic Indicator
DRS Doors
DRT Derate
DRVG Driving
DRVN Driven
DRVR Driver
DRWY Doorway
DS Destination
DS Directionally Solified
DS Discard
DSA Detailing Sensor Assembly
DSAP Disappearance
DSB Double Sideband
DSBL Disable
DSCD Descend
DSCRM Discriminator
DSCRT Discrete
DSCRT IO Discrete Input/Output
DSDU Data Signal Display Unit
DSENG Disengage
DSENGD Disengaged
DSF Display System Function
DSMS Design Success Measurement System
DSNT Descent
DSP Display Select Panel
DSP Display
DSP Digital Signal Processing
DSPL Display
DSPLY Display
DSR Desired (altitude)
DSRTK Desired Track Angle
DSS Detailed System Specification
DST Diffracto-Sight (MD)
DSU Digital Server Unit (787)
DSWC Digital Stall Warning Computer
DT Double Throw (MD)
DTB Dead Tie Bus
DTD Dated
DTD Document Type Definition
DTF Design Facility Tool
DTG Distance To Go
DTK Desired Track (angle)
DTM Display Transfer Module
D-TO Derated Takeoff Limit
DTR Damage Tolerance Rating
DTR Data Transmit/Receiver
DTS Dual Temperature Sensor
DT SHIP Date Shipped (Sonic)
DTU Digital Tapping Unit (787)
DU Display Unit
DUDB Display Unit Database
DUM Dummy
DUP Duplicate
DV VOR/DME
DVI Detail Visual Inspection
DWG Drawing

15 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
E East EDIU Engine Data Interface Unit
EA Each EDM Engine Data Multiplexer
EACS Electronic Automatic Chart System EDM Electric Discharge Machine
EAD Engine and Alert Display EDM Electro-Discharge Machining
EADB Enhanced Area Distribution Box EDMC Engineering Drawing Microfilm Card
EADI Electronic Attitude Director Indicator EDP Engine Driven Pump
EAF Expanded Aluminum Foil (787) EDP Electronic Data Processing
EAFR Enhanced Airborne Flight Recorder (787) EDP Engine Display Panel
EAI Engine Anti-Ice, Engine Anti-Icing EDPE Electronic Data Processing Equipment
EAMR Engineering Advanced Material Release EDSD Electrostatic Discharge Sensitive Device
EAROM Electrically Alterable Read Only Memory EDTA Ethylenediamine Tetraacetate
EAS Equivalent Airspeed EDW Electronically Dimmable Window (787)
EAS Elevator Autopilot Servo E/E Electrical/Electronics
EAT Expected Approach Time E/E Electronic Equipment
EAU Engine Accessory Unit E&E Electronic Equipment
EB Electron Beam EEBD Emergency Escape Breathing Device
EBA Electric Brake Actuator (787) EEC Electronic Engine Control
EBAC Electric Brake Actuator Controller (787) EEC Electronic Engine Controller
EBCC ECS Bleed Configuration Card EEC Electronic Equipment Compartment
EBCU Electric Brake Control Unit (787) EECM Electronic Engine Control Monitor
EBG Engine Build Group EECS Electronic Engine Control System
EBL Engine Buttock Line EEPROM Electrically Erasable Programmable Read-Only
EBPM Electric Brake Power Module (787) Memory
EBPSU Electric Brake Power Supply Unit (787) EEROM Electrical Erasable Read Only Memory
EBS Engine Bleed System EF Existing Faults (CMC)
EBS Engine Build Specification EFAS Enroute Flight Advisory System
EBU Engine Build Up EFB Electronic Flight Bag
EC Engine Control EFBEU Electronic Flight Bag Electronic Unit (787)
E/C Economy Class EFC Elevator Feel Computer
E/C Engine Change (MD) EFC Expected Further Clearance (time)
ECAC Electric Cabin Air Compressor (787) EFCC Electronic Flight Control Computer
ECAM Electronic Centralized Aircraft Monitoring EFCS Electronic Flight Control System
ECB Electronic Control Box (APU) EFCU Electronic Flight Control Unit
ECB Electronic Circuit Breaker (787) EFCU Elevator Feel and Centering Unit
ECC Equipment Cooling Card EFCU Engine Fuel Control Unit (MD)
ECC Eccentric EFDARS Expandable Flight Data Acquisition and
ECCS Equipment Cooling Control System Recording System
ECD Electrocardiogram EFDS Engine Fault Display System
ECD Estimated Completion Date EFDU Engine Fault Display Unit
ECM Engine Condition Monitoring EFF Effective, Effectivity
ECM Electro-Chemical Machining EFF Efficiency
ECM Electronic Countermeasures EFI Electronic Flight Instrument
ECM Engineering Change Memo EFIS Electronic Flight Instrument System
ECON Economy EFIS CP EFIS Control Panel
ECON Economic EFIS/DSP Electronic Flight Instrument System/Display Select
ECP ECAM Control Panel Panel (787)
ECP Engineering Change Proposal EFISSG EFIS Symbol Generator
ECP Entertainment Control Panel (787) EFIS SGU EFIS Symbol Generator Unit
ECR Engineering Change Request EFOB Estimated Fuel On Board (MD)
ECS Environmental Control System EFSG EFIS Symbol Generator
ECS Electronic Cooling System EG For Example
ECS Engine Control System EGA Extra Ground Attenuation
ECSF Engine Control System Fault EGM Ethernet Gateway Module (787)
ECSL Left Environmental Control System card EGT Exhaust Gas Temperature
ECSMC Environmental Control Systems Miscellaneous EGT Engine Gas Temperature
Card EHF Extremely High Frequency
ECSR Right Environmental Control System card EHM Engine Health Monitoring
ECU Electronic Control Unit (APU) EHS Extra High Shear
ECU Engine Control Unit (G.E. engine) EHSI Electronic Horizontal Situation Indicator
ECU Environmental Control Unit (MD) EHSV Electro-Hydraulic Servo Valve
ECV Economy Cooling Valve EHV Electro-Hydraulic Valve
ED End of Descent EICAS Engine Indication & Crew Alerting System
ED Edge Distance EICAS/CP EICAS Control Panel
ED End of Display EIS Electronic Instrument System
E/D End of Descent EIS Engine Instrument System
E*D End of Descent EIS Engine Indicating System
EDHP Engine-Driven Hydraulic Pump EISCP Electronic Instrument Control Panel
EDI Engine Data Interface EIU Engine Interface Unit

16 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
EIU EFIS/EICAS Interface Unit ENG LIM Engine Limit
EJCTR Ejector (MD) ENG OUT Engine Out
EL Elevation ENGR Engineer
EL Equipment List ENGRG Engineering
EL Electroluminescent ENGS Engines
ELAPS Elapsed Time ENG VIB Engine Vibration
ELB Electronic Log Book ENP Estimated Normal Payload
ELC Engine Limiter Control ENRGZ Energize
ELCC Electrical Load Control Contactors (787) ENT Entertainment
ELCCR Electrical Liaison Commitment Center Record ENT Enter, Entry, Entrance
ELCF Electrical Load Control Function (787) ENTMT Entertainment
ELCU Electrical Load Control Unit ENTR Entrance
ELEC Electric, Electrical, Electricity ENT T/R Entertainment Tape Reproducer
ELEC Electronic ENV Envelope
ELECT Electric ENWY Entryway
ELECT Electronic EO Engine Out
ELEK Electronic EO Engineering Order
ELEKS Electronics E/O Engine Out
ELEV Elevation EOAP Electronic Overhead Annunciator Panel
ELEV Elevator EOEW Equivalent Operating Empty Weight
ELEX Electronic EOI Engineering Operating Instruction
ELF Elevator Load Feel (MD) EOP End Of Part
ELF Extremely High Frequency (MD) EOSID Engine Out Standard Instrument Departure
ELFA Elevator Load Feel Actuator EOT End Of Tape
ELI Equipment List EP Entry Panel
ELIM Eliminate EP External Power
ELMS Electrical Load Management System EPA Emergency Power Assist
ELR Engineering Liaison Request EPA Environmental Protection Agency
ELS Electronic Library System EPAS Emergency Power Door Assist System (787)
ELT Emergency Locator Transmitter EPC External Power Contactor
ELV Elevation EPC Electrical Power Center
ELV Elevator EPCU Electrical Power Control Unit
EMA Electro-Mechanical Actuator (787) EPCR External Power Control Relay
EMBS Electro Mechanical Braking System (787) EPCS Electronic Propulsion Control System
EMC Entertainment Multiplexer Controller EPESC Enhanced Passenger Entertainment System
EMC Executive Maintenance and Materiel Council Controller
EMCU Electromechanical Control Unit (787) EPFP External Power Fault Protection
EMCU Electronic Motor Control Unit (787) EPGS Electrical Power Generating System
EMDP Electric Motor Driven Pump EPP EEC Programming Plug
EME Electromagnetic Effect (787) EPR Engine Pressure Ratio
EMER Emergency EPR Exhaust Pressure Ratio
EMERG Emergency EPR Ethylene Propylene Rubber
EMF Electromotive Force EPR.D EPR Descent
EMHP Electric Motor-Driven Hydraulic Pump EPRL Engine Pressure Ratio Limit
EMI Electro-Magnetic Interference EPR.L EPR Latch
EMMU Engine Monitoring Multiplex Unit EPROM Electrically Programmable Read Only Memory
EMP Electric Motor Pump EPROM Erasable Programmable Read Only Memory
EMP Empennage EPU Emergency Power Unit
EMP Electromagnetic Pulse EQ Equipment
EMP Engine Management Program EQA Equipment Quality Analysis
EMR Electromagnetic Riveting EQA Engineering Quality Analysis
EMS Electronic Mail System EQL Equalizer
EMU Engine Maintenance Unit EQPMT Equipment
EMU Event Monitoring Unit EQPT Equipment
EMU Engine Module Unit EQUAL Equalization Signal
EMU Engine Monitoring Unit (787) EQUIP Equipment
EN Enable EQUIV Equivalent
ENBL Enable ER Extended Range
ENCD Encode ER Elevator Rib
ENCDR Encoder ER Enroute Cruise
ENCL Enclosure ERD Excessive Rate Detector
END Endurance ERECT Erection
ENDUR Endurance ERF Exceedance RAM Full
ENG Engine ERI Extended Repeat Interval
ENG Engage EROPS Extended Range Operations
ENGA Engage ERP Eye Reference Point
ENGD Engaged ERP Effective Radiated Power
ENG EXCD Engine Exceedance ERR Error

17 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
ERS Erase, Erased EX Exhaust
ERS Earth Reference System (787) EX Excitation
ERU Engine Relay Unit EX Example
ES Engine Start EXC Excite, Excitation
ESC Entertainment/Service Controller EXCD Exceedance, Exceedances
ESC Entertainment System Controller EXCD Excited
ESC Escape EXCESS Excessive
ESC Engine Supervisory Controller EXCG Exciting
ESC Environmental System Controller EXCH Exchange
ESC Escutcheon (MD) EXCIT Excitation
ESCC Electrical Supply and Control Center EXCN Excitation
ESCP Electrical System Control Panel (MD) EXCT Excitation
ESCV Eleventh Stage Cooling Valve EXCTR Exciter
ESD Electrostatic Discharge EXEC Execute
ESD Electronic System Display EXH Exhaust
ESDS Electrostatic Discharge Sensitive EXP Expand, Expanded, Expansion
ESFC Equivalent Specific Fuel Consumption Expl. Explosive
ESHP Equivalent Shaft Horsepower EXT External
ESI Engine Start Inhibit EXT Extend, Extended, Extension
ESIC Electrical power System Indication & Control (787) EXT Exterior, External
ESNTL Essential EXT Extinguish-Extinguisher (MD)
ESNP Engine Serial Number Plug EXTC Extract
ESP Emergency Spill Valve EXTCD Extracted
ESS Essential EXTCG Extracting
ESS Engine Start System EXTEN Extension
EST Estimated EXTG Extending
ESTA Engine Station EXTIG Extinguishing
ESTS Electronic System Test Set EXTIN Extinguish, Extinguished, Extinction
ESU Electronic Sequence Unit EXTING Extinguishing, Extinguish
ESU Electronic Switching Unit EXTIR Extinguisher
ET Elapsed Time EXTN Extension
ET Extended Trailing Edge EXTR Extrude, Extrusion
E/T Electrical Trim EXTRACT Extraction
ETA Estimated Time of Arrival EZ Electrical Zero
ETC Electronic Turbine Control
ETC Essential Tie Contactor
ETC Electrical Temperature Control
ETC Electronic Temperature Control
ETD Estimated Time of Departure
ETE Estimated Time Enroute
ETHF Eddy Current High Frequency (MD)
ETI Elapse Time Indicator
ETLF Eddy Current Low Frequency (MD)
ETM Elapsed Time Meter
ETO Estimated Time Over
ETO Estimated Time Overhead (MD)
ETOPS Extended (range) Twin-engine Operations
ETP Equal Time Point
ETPU Engine Transient Pressure Unit
ETPU Electrical Transient Pressure Unit
ETS Equipment Technical Specification
EU Excessive Update
EU Electronic Unit (787)
EV Electro Valve
EV East Velocity
EV Excessive Velocity
EVAC Evacuation
EVAL Evaluation
EVAP Evaporate, Evaporator
EVBC Engine Vane Bleed Control
EVM Engine Vibration Monitor
EVS Enhanced Vision Systems (787)
EVSC Engine Vibration Signal Conditioner
EVSCU Enhanced Video System Control Unit
EVT Event
EWA Engineering Work Authorization
EWL Engine Waterline
EWS Electronic Warning System

18 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
F Fahrenheit (degrees) FCM Flight Control Module
F Force FCNSE Flight Control Neutral Shift Enable
F Minimum Flap Retract Speed (EFIS) FCOC Fuel Cooled Oil Cooler
F Flare FCOM Flight Crew Operating Manual
F Fire FCP Flight Control Panel (MD)
F Fuel FCP Fuel Control Panel (787)
F Farad FCPI Flight Control Position Indicator
f Function (of) FCS Flight Control System
FA Final Approach FCS Flight Control Surface
F/A Flight Attendant FCS Fuel Compensation Sensor (787)
F/A Final Assembly FCSOV Flight Control Shut-Off Valve
FA Family (WDM) FCST Forecast
FAA Federal Aviation Administration FCT Functional
FAB Fabricate, Fabrication F/CTL Flight Control
FAC Flight Augmentation Computer FCTM Flight Crew Training Manual
FACIL Facility FCTN Function
FACS Flight Augmentation Computer System FCU Flight Control Unit
FAD Forward Access Door (787) FCU Fuel Control Unit
FADEC Full Authority Digital Electronic Control FCU Flap Control Unit
FADEC Full Authority Digital Engine Control (MD) FCU Fire Control Unit (MD)
FAEEC Full Authority Electronic Engine Control FCV Flow Control Valve
FAF Final Approach Fix FD Flight Director
FAFC Full Authority Fuel Control FD Fuselage Datum
FAIL Failed, Failure FD Course from a Fixed waypoint to DME Distance
FAIR Fairing FD Flaps Down
FAJ Floor Assembly Jig (787) F/D Flight Director
FAMV Fan Air Modulating Valve F/D Fan Discharge
FAOM Flight Attendant Operating Manual F/D Frequency to Digital
FAR Federal Airworthiness Regulation FDAF Flight Data Acquisition Function
FAR Federal Aviation Regulations FDAP Flight Deck Audio Panel
FAR/CS FAR Certification Specification FDAU Flight Data Acquisition Unit
FAS Flight Augmentation System FDAMS Flight Data Acquisition Management System (MD)
FASTNR Fastener FDBK Feedback
FAT Free Air Temperature FD CMD Flight Director Command
FATM Flight Attendant Training Manual FDAF Flight Data Acquisition Function (787)
FATS Fan Air Temperature Sensor FDAS Flight Deck Access System (787)
FAV Fan Air Valve FDB Floor Disconnect Bracket (787)
FAWP Final Approach Waypoint FDD Floppy Disk Drive
F/B Form Board FDD Flight Deck Door (787)
FBH Forward Bearing Housing FDDI Fiber Distributed Data Interface
FBM Feet Board Measure FDDVA Flow Divider and Drain Valve Assembly
FBS Fixed Base Simulator FDE Flight Deck Effect
FBW Fly By Wire FDE Flight Director Engaged
FC First Class FDEP Flight Data Entry Panel
FC Freight Container FDEVSS Flight Deck Entry Video Surveillance System (787)
FC Fully Closed FDH Flight Deck Handset
FC Footcandle FDM Fault Data Management
FC Functional Check FDMU Flow Divider Metering Valve
FC Course from a Fixed waypoint to a Changeover FDPS Flight Director Pitch Sync
Point FDR Flight Data Recorder
FC Flight Controls (787) FDR Feeder
F/C First Class FDRS Flight Data Recorder System
F/C Fully Closed FDS Flight Director System
F/C Functional Check FDS Flight Director Selected
FCA Fuel Condition Actuator FDS Fuel Density Sensor (787)
FCAC Forward Cargo Air Conditioning (787) FDSU Flight Data Storage Unit
FCC Flight Control Computer F/E Flight Engineer
FCCS Flight Control Computer System FE Flap Extend (MD)
FCCU Flight Control Computer Unit FED Federal
FCD55 Full Color Display 5x5 FED-STD Federal Standards
FCDC Flight Control Direct Current FESC Forward Electronic Service Center
FCDC Flight Critical DC FET Field Effect Transistor
FCE Flight Control Electronics FEW Fleet Empty Weight
FCEPS Flight Control Electronic Power Supply FEXT Fire Extinguisher
FCES Flight Control Electronic System FF Fuel Flow
FCES PM FCES Power Monitor FF Feeder Fault
FCEU Flight Control Electronics Unit FF Fast Forward
FCM Fuel Conservation Manual FF Final Fix

19 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
F/F Fuel Flow Fla.L Flammable Liquid
F/F Flip Flop Fla.S Flammable Solid
F-F Fuel Flow FLC Feel and Limitation Computer
FFCC Forward Facing Crew Cockpit Concept FLCH Flight Level Change
FFCC Forward Facing Crew Cockpit Configuration FL CH Flight Level Change
FFCCV Flight Guidance Control Panel FL CHG Flight Level Change
FFCCV Fan Frame Compressor Case Vertical FLD Field
FFEU Fuel Flow Electronics Unit FLDK Flight Deck
FFG Fuel Flow Governor FLDT Floodlight
FFL Flip Flop Latch FLE Fixed Leading Edge (787)
FFP Fixed Firm Price FLEX Flexible
FFR Fuel Flow Regulator FLG Flange
FFRATS Full Flight Regime Autothrottle System FLH Flat Head
FFS Fuel Flow System FLLT Flashing Light
FFS Full Flight Simulator FLMPRF Flameproof
FFWD Fast Forward FLMTR Flowmeter
FGI Flight-Ground Idle FLNG Fueling
FGN Foreign FLOE Flight Operations Engineering
FGS Flight Guidance System FLOT Flotation
FH Flight Hour(s) FLP Flap
FH-All Fault History - All (CMC) FLR Flare
FHP Friction Horsepower FLRS Flap Load Relief System
FHS Fuel Height Sensor (787) FL SB Flap Switch Box
FI Fault Isolation FLT Flight
FI Flight Idle FLT ATTD Flight Attendant
FIAU Flight Instrument Accessory Unit FLT CONT Flight Control
FIDDS Fault Isolation Data Display System FLT DIR Flight Director
FIDO Flight Information and Data Output (FMC) FLT DK Flight Deck
FIDS Fault Isolation and Detection System FLT/DK Flight Deck
FIFO First Input/First Output FLT INT Flight Interphone
FIG Figure FLT LDR Fleet Leader
FIL Filament FLTP Flight Path
FIL Fillet FLT PLN Flight Plan
FIL H Fillister Head FLTR Filter
FILT Filter FLT RCDR Flight Recorder
FIM Fault Isolation Manual FLT REC Flight Recorder
FIM Fault Indication Module FLUOR Fluorescent
FIM Fault Isolation Monitor FLWG Following
FIM Full Indicator Movement FLX Flexible
FIN Functional Item Number FLXTO Flexible Take-Off
FIN Vertical Stabilizer FM Frequency Modulation
FIN STA FIN (vertical stabilizer) Station FM Fan Marker
FIN WL FIN (vertical stabilizer) Waterline FM Course from a Fixed waypoint with a Manual
FIP Flight Interphone termination
FIR Full Indicator Reading FM Function Module
FIR Flight Information Region FMA Flight Mode Annunciator
FIREX Fire Extinguisher FMC Flight Management Computer
FIRM Fault Isolation Reporting Method FMCF Flight Management Computing Function
FIS Flight Information Service FMCS Flight Management Computer System
FIS Flight Instrument System FMC SPD FMC controlled Speed
FIS-B Flight Information Service - Broadcast (787) FMCU Flight Management Computer Unit
FISR Fleet Issues Summary Report FME Floor Mounted Equipment (tool)
FIT Final Integration Team (787) FMEA Failure Mock Effect Analysis
FIT First Officer Instrument Transfer (787) FMEA Failure Mode and Effect Analysis
FJCC Fuel Jettison Control Card FMF Flight Management Function (787)
FK Fork FMPI Fluorescent Magnetic Particle Inspection
FL Flight Level FMS Flight Management System
FL Flow FMSM Fuel Measuring Stick Manual
FL Flood FMU Fuel Metering Unit
FL Floor FMV Fuel Metering Valve
FL Fluid F/N Flag Note
FL Flap FNA Final Approach
FL Flight FNC Fuel Nozzle Controller (787)
FL Focal Length FNCP Flight Navigation Control Panel
FL Flight Limiter (MD) FNP Fusion Point
FLA Fin Load Alleviation (787) FNSG Flight Navigation Symbol Generator
FLACW Fault Action Word FO Fully Open
Fla.G Flammable Compressed Gas FO First Officer

20 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
F/O First Officer FS Flight Simulator
FOB Fuel On Board Fs Control Force
FOB Free On Board F/S Fast/Slow
F/OBS First Observer F/S Front Spar
FOC Fuel Oil Cooler, Fuel Oil Cooling F/S Full Size
FOC Free Of Charge FSASR Field Service Airline Status Report
FOC Flight Control Computer (MD) FSB Fasten Seat Belt
FOD Foreign Object Damage FSC Federal Supplier Code
FOD Fuel Over Destination FSC Fuel System Controller
FOEB Flight Operations Evaluation Board FSCM Federal Supply Code for Manufacturers
FOHE Fuel Oil Heat Exchanger (787) FS D Fast Slew, Date (clock)
FOOC Fuel Cooled Oil Cooler FSD Fast Slew and Day (MD)
FOPB Flight Operations Policy Board FSDO Flight Standards District Office
FOR Flight Operations Review FSE Field Service Engineering
FOR DET For Detail FSEIC Fuel System EICAS Interface Card
FORG Forging (MD) FSEU Flap/Slat Electronic Unit
FOX Fiber Optic Translator FSLG Fuselage
FP Fuel Pressure FSM Fuel System Management (MD)
FP Freezing Point FSM Fuel Shutoff Module (787)
FPA Flight Path Angle FSM File Server Module (787)
FPAC Flight Path Acceleration FSMC Fuel System Management Card
FPD Facility Planning Document FSN Federal Stock Number
FPD Freezing Point Depressant FSO Flight Standards Office (FAA)
FPI Fluorescent Penetrant Inspection FSOV Fuel Shutoff Valve
F-PLN Flight Plan FSPM Flap/Stabilizer Position Module
F/PLN Flight Plan FSR Field Service Report
FPM Feet Per Minute FSS Front Spar Station
FPP Forward Power Present FSS Flight Service Station
FPS Feet Per Second FSSI Front Spar Station Inboard
FPT Flight Path Target FSSO Front Spar Station Outboard
FPV Flight Path Vector FS STA Front Spar Station
FQ Fuel Quantity FSTN Fasten
FQDC Fuel Quantity Data Concentration (787) FSTNR Fastener
FQDU Fuel Quantity Display Unit FSU Fuel Summation Unit
FQI Fuel Quantity Indicator FSV Full Scale Value
FQI Fuel Quantity Indication F SYNC Fast Synchronization
FQIS Fuel Quantity Indicating System FT Feet, Foot
FQMS Fuel Quantity Management System (787) FT Fuel Temperature
FQPU Fuel Quantity Processor Unit FT Functional Test
FQS Fuel Quantity System FT Flight Test
FR Field Relay F/T Functional Test
FR Front FTC Flare Test Complete
FR From FTE Fixed Trailing Edge (787)
FR Frame FTG Fitting
FR Flap Retract (MD) FTK Freight Tonne Kilometre
FRAG Fragment FTK Fuel Tank
FRAT Full Rate Auto Trim FTL Foot-Lambert
FRCM Flight Recorder Control Module FT-LB Foot-Pound
FRCP Flight Recorder Control Panel FT/MN Feet per Minute
FREQ Frequency FTMS Federal Test Method Standard
FRES Fire Resistant FTR Fuel To Remain
FRICT Friction FTRNG Feathering
FRIV Fuel Return Isolation Valve (787) FTRP Fleet Team Resolution Process
FRM Fault Reporting Manual FTS Frame Time Select
FRM From FT/SEC Feet per Second
FRO Future Replacement Order FU Fuse
FRP Fiberglass Reinforced Plastics FU Fuel Used
FRQ Frequency FU Feedback Unit
FRT Front FU Flaps Up
FRTT Fuel Return To Tank (787) F/U Follow-Up
FRTTV Fuel Return To Tank Valve (787) FUNC Functional
FRTV Fuel Return To Tank Valve FUNCT Functional
FS Front Spar FURN Furnishings-Furniture (MD)
FS Fast Slew FUS Fuselage
FS Fuselage Station FUSLG Fuselage
FS Flap Switch FV Flux Valve
FS Fuel Savings FW Firewall
FS Federal Specification FW Failure Warning

21 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
F/W Firewall G Gravity
F/W Failure Warning G Gravitational Unit
FWC Flight Warning Computer G Gram
FWC Factory Work Code G Green
FWD Forward G Gyro
FWL Fin (vertical stabilizer) Waterline G Grid
FWS Flight Warning System G Generator
FWSD Flight Warning and System Display GA Go-Around
FWSOV Firewall Shutoff Valve GA General Application
FWT Folding Wing Tip GA Gauge
FWTEC Folding Wing Tip Electronic Card G/A Go Around
FXD Fixed G/A Ground-to-Air
FY Fiscal Year GAC Ground Air Connection
FYI For Your Information GAE Go Around Engaged
GAIR General Assembly Inspection Report
GAL Gallon, Gallons
GAL/HR Gallons per Hour
GAL/SEC Gallons per Second
GALV Galvanize
GALV Galvanometer
GALVI Galvanized Iron (MD)
GALY Galley
GAMMA-A Slope
GAMMA-T Potential Slope
GAS Go Around Selected
GATU Galley Auto Transformer Unit (787)
GB Generator Breaker
GBAS Ground Based Augmentation System (787)
GBS Generator Breakers
GBST Ground Based Software Tool
GCA Ground-Controlled Approach
G-CAL Gram-Calorie
GCB Generator Circuit Breaker
GCB Generator Control Breaker (787)
GCM Ground Checkout Module
GCP Glareshield Control Panel
GCR Generator Control Relay
GCR Generator Control Regulator
GCR Group Coded Recording
GCS Ground Clutter Suppression
GCU Generator Control Unit
GCU Galley Cooling Unit (787)
GD Gear Down
GDL Ground List
GDNC Guidance
GE General Electric
GE Gear Extend (MD)
GEN Generator
GEN General
GENL General
GENX General Electric engine designation (787)
GES Ground Earth Station
GF Generator Field
GFAE Government-Furnished Aircraft Equi
GFE Government Furnished Equipment
GFR Generator Field Relay
GFRP Fiberglass Fiber Reinforced Plastic (787)
GFTM General Familiarization Training Manual
GG Graphics Generator
G/G Ground Guidance
GHD Ground Handling Document
GHE Ground Handling Equipment
GHR Ground Handling Relay
GI Ground Idle
GIM General Introduction Manual
GLC Generator Line Contactor
GLR Galley Load Relay
GLR Generator Line Relay

22 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
GLS GPS Landing System (787) G/SF Glide Slope Flag
GLY Galley GSGP Glide Slope Gain Program
GM Gram GSI Glideslope Intercept
GMC General Modifications Committee GSKT Gasket
GMR Ground Movement Radar GSM General Structure Manual
GMT Greenwich Mean Time GSPD Groundspeed
GND Ground GSPR Gasper
GNDA Ground Acceleration GSR Ground Service Relay
GND RET Ground Return GSRV Glide Slope Receiver Validity
GNDV Ground Speed GSSR Ground Service Select Relay
GNR Generator Neutral Relay (787) GST Glide Slope Track
GNS Global Navigation System (MD) GST Gimbal Slew Test
GNSS Global Navigation Satellite System (787) GSTR Ground Service Transfer Relay
GNSSU Global Navigation Satellite System Unit (MD) GS TRK Glide Slope Track
GO ARND Go-Around GTA General Terms Agreement
GOV Governor GTHRG Gathering
GOVT Government GTV Gate Valve
GOX Gaseous Oxygen GU Gear Up
GP Gain Program GUID Guidance
GP Group GVI General Visual Inspection (MD)
GP Glide Path GVL Gravel
GP General Purpose GW Gross Weight
G/P Glidepath GWAD Galley Waste Disposal Sink (787)
GPA Glide Path Angle (MD) GWIV Grey Water Interface Valve (787)
GPCP Ground Proximity Control Panel GWT Gross Weight
GPCT Ground Power Current Transformer G-x Galley-x
GPCU Ground Power Control Unit GY Gray
GPH Gallons Per Hour GYRO Gyroscope
GPIRS Global Position Inertial Reference System (787)
GPM Gallons Per Minute
GPM General Processing Module (787)
GPROX Ground Proximity
GPS Global Positioning System
GPS Gallons Per Second
GPSSU Global Positioning System Sensing Unit
GPU Ground Power Unit
GPWC Ground Proximity Warning Computer
GPWM Ground Proximity Warning Module
GPWS Ground Proximity Warning System
GR Gear Retract
GR Graphic Recorder
GR Generator Relay (MD)
GR Graphite (787)
GRA Gray
GRA Geared Rotary Actuator
GRAD Gradation
GRC Ground Radio Communication
GRD Ground
GRD PWR Ground Power
GRN Green
GRO Ground Roll Out
GRP Group
GRP Geographic Reference Point
GRP Ground Reference Point
GRP Glass-Reinforced Plastic
GRS Gust Response Suppression
GRS Galley Refrigeration System (787)
GRU Galley Refrigeration Unit (787)
GRV Groove
GRVTY Gravity
GS Glide Slope
GS Ground Speed
G/S Glide Slope
G/S Ground Speed
GSB Ground Service Bus
GSC Glide Slope Capture
GS CAP Glide Slope Capture
GSE Ground Support Equipment

23 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
H Hot H/L High Low
H Hour HLAC High Level AC Voltage
H High, Height HLCL Helical
H Hot (electrical point) HLCS High Lift Control System
H Hydrogen HLD Hold
H Headwind HLDC High Level DC Voltage
H2O Water HLDG Holding
HA Holding Pattern to an Altitude Termination HLDR Holder
HA Hectare HLF High Lift Function (787)
HA Hose Assembly HLTY Healthy
HA Hosted Application (787) HM Holding pattern with a Manual termination
HAA Height Above Airport HMG Hydraulic Motor Generator
HAS Heading and Attitude System HMU Hydro-Mechanical Unit
HAT Height Above Touchdown H NAV Horizontal Navigation
HB Brinnell Hardness Test Value HNBK Handbook
HBAW Handbook Bulletin for Airworthiness (FAA) HND Hand
HBM Heart Beat Monitor HNDBK Handbook
HBOV Handling Bleed Off Valve HNG Hinge
HC Hose Component H/O Hard-Over
HCAU Heading Coupler Accessory Unit HOC High Oil Consumption
HCC High Pressure Case Cooling HOLD Holding
HCM Hydraulic Control Module (787) HOLD Y Hold-Year
HCS Hydromechanical Control System HOQ Hydraulic Oil Quantity
HCS High Carbon Steel (MD) HOR Horizontal
HCU HUD Combiner Unit (787) HORIZ Horizon
HCU Hydraulic Control Unit (787) HORIZ Horizontal
HD Head HORZ Horizon
HDD Head Down Display (787) HOT High Oil Temperature
HDF Hot Draped Formed (787) HP High Pressure
HDG Heading HP Horsepower
HDG HOLD Heading Hold HP High Pass
HDGR Heading Rate HPA Hectopascals (Millibars)
HDG HLD Heading Hold HPA High Power Amplifier
HDG/S Heading Select, Heading Selected HPC High Pressure Compressor
HDG SEL Heading Select HPE High Pressure Hook Engage
HDG/STS Heading Status HP FCOC High Pressure Fuel Cooled Oil Cooler
HDL Handle HPFAC High Pressure and Fan Air Controller
HDLG Handling HPHF High Pressure Hook Fault
HDS Horizontal Drive Shaft HP HR Horsepower-Hour
HDST Headset HP-HR Horsepower-Hour
HEPA High Efficiency Particulate Air HPI Hydraulic Pressure Indicator
HEPA High Efficiency Particle Accumulator (787) HPM High Pressure Hook Monitor
HEX Hexadecimal HPMV High Pressure Hook Monitor Valid
HEX Hexagon HPNGV High Pressure Nozzle Guide Vane
HF High Frequency HPR High Pressure Rotor
HF Holding Pattern to a Fixed waypoint HPSOV High Pressure Shut Off Valve
HF High Friction HPSOV High Pressure Fuel Shutoff Valve (MD)
HFEC High Frequency Eddy Current HPT High-Pressure Turbine
HFSOV High Flow Shutoff Valve (787) HPTACC High Pressure Turbine Active Clearance Control
Hg Mercury HPTC High Pressure Turbine Cooling
HGA High Gain Antenna (MD) HPU HUD Projector Unit (787)
HGR Hangar HPWS High Pressure Water Separator
HGT Height HQI Hydraulic Quantity Indicator
HGW High Gross Weight HQIU Hydraulic Quantity indication Unit
HHE Heading Hold Engaged HQTRS Headquarters
HI High HR Radio Height (altitude)
HIAD Handbook of Instruction for Aircraft Designers HR Hour
HID High Intensity Discharge (787) HR Hot Rolled
HIL Hold Item List HR Human Resources
HILDA High Lift Data Analyzer HR Heading Reference (787)
HILDA High Lift Databus Analyzer HR(x) Rockwell Hardness Test Value
HIRF High Intensity Radiated Fields HR(xxx) Rockwell Superficial Hardness Test Value
HIRL High Intensity Runway Lights HRD Hard
HIV Hydraulic Isolation Valve HRD Hardware Requirements Document
HI Z High Impedance HRD High-Rate Discharge (787)
HK Knoop Hardness Test Value HRF Hand Router Fixture (787)
HL High Level HRS Hours
H/L Hold Item List HRS Hot Rolled Steel (MD)

24 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
HRZN Horizon (MD) I Index
HS High Speed I Inertial
HS Horizontal Stabilizer I Implementation Age (MPD)
HS High Stage IACS International Annealed Copper Standard
H/S Horizontal Stabilizer IAE International Aero Engines (MD)
HSBL Horizontal Stabilizer Buttock Line IAF Initial Approach Fix
HSC Hydraulic Service Center IAN Integrated Approach Navigation (787)
HSC Hydraulic System Controller IAS Indicated Air Speed
HSCP Hydraulic System Control Panel (MD) IASE Indicated Air Speed Engaged
HSCT High Speed Civil Transport IASS Indicated Air Speed Selected
HSD Hours Slew-Day IAT Inhibit Auto Trim
HSE Heading Select Engaged IATA International Air Transport Association
HSG Housing IATP International Airline Technical Pool
HSI Horizontal Situation Indicator IAW In Accordance With
HSI Hot Section Inspection IAWLU Inertial Aural Warning Logic Unit
HSPRSOV High Stage Pressure Regulating and Shutoff IAWP Initial Approach Waypoint
Valve IB Inboard
HSRP Horizontal Stabilizer Reference Plane IBIT Initiated Built-In-Test
HSS High Speed Steel IBN Identification Beacon
HST Horizontal Stabilizer Tank IBVSU Instrument Bus Voltage Sense Unit
HSTA Horizontal Stabilizer Trim Control Actuator (787) IC Integrated Circuit
HSV High Stage Valve IC Interchangeability Code
HT Heat IC Initial Climb
HT Heat-Treat IC Invoice Control Card
HT Height I/C Inspection/Check
HT Hard Time I/C Intercom
H/T Heat-Treat I/C Interphone Communication
HTAS High True Airspeed ICAO International Civil Aviation Organization
HTD Heated ICD Interface Control Document
HTG Heating ICM Instrument Comparison Monitor
HTR Heater ICPI Integrated Cabin Pressure Indicator
HTS High Tensile Steel (MD) ICR Integrated Communication Resource (787)
HTSA Height Switch A (1500 ft) IC-RT Intercom-Radio Transmitter
HTSB Height Switch B (Flare) ICS Intercommunications System
HT TR Heat Treat ICS Integrated Cooling System (787)
HUD Heads Up Display ICU Instrument Comparator Unit
HUL Hook-Up List ICU Interface Control Unit
H/U Hook-Up ICY Interchangeability
HV High Voltage ID Identification, Identifier
HV Vickers Hardness Test Value ID Inside Diameter
HVDC High Voltage Direct Current (787) IDD Inertial/DME-DME
HVDF High and Very High Frequency Direction IDENT Identify, Identification
Finding Stations IDENT Identifier
HVPS High Voltage Power Supply IDG Integrated Drive Generator
HVY Heavy IDGS Integrated Drive Generator System
HWBPT Hardware Breakpoint IDN Isolated Data Network (787)
H/WIND Head Wind IDP Integrated Data Processing
HX Heat Exchanger ID PL Identification Plate
HYD Hydraulic IDS Integrated Display System
HYDIF Hydraulic Interface Function (787) IDS Ice Detection System (MD)
HYDIM Hydraulic Interface Module IDU Integrated Display Unit
HYDQUIM Hydraulic Digital Quantity Interface Module IDU Interactive Display Unit
HYDR Hydraulic IDV Inertial/VOR-DME
HYDRST Hydrostatic (MD) IE In Effect (that is)
HYQUIM Hydraulic Quantity Indicating Module IEC Integrated Electronic Control
Hz Hertz IEPR Integrated Engine Pressure Ratio
IF Intermediate Frequency
IF Initial Fix
IF In Flight
I/F Interface Fault
IFE In-Flight Entertainment
IFF Identification Friend or Foe
IFR Instrument Flight Rules
IFSAU Integrated Flight System Accessory Unit
IFSD In Flight Shut Down
IFSS Inboard Front Spar Station
IGB Inlet Gearbox
IGN Ignition

25 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
IGS Integrated Graphic System INIT Initial, Initialization
IGV Inlet Guide Vane INIT REF Initialization Reference
IGVA Inlet Guide Vane Actuator INL Inlet
IGW Increased Gross Weight IN-LBS Inch-Pounds
IHC Integrated Handset Controller INOP Inoperative
IHCB Industrial Hazards Control Bulletin INP Input
IHP Indicated Horsepower INPH Interphone
IHPH Indicated Horsepower Hour INR Inner
IHP-HR Indicated Horsepower Hour INR Integrated Navigation Radio (787)
IHS Industrial Hygiene and Safety Standards INRTL Inertial
IIPD Illustrated Initial Provisioning Document INS Inertial Navigation System
ILA Instrument Landing Approach (MD) INS Insulate
ILCB Indicator Light Control Box INS Insurance (Sonic)
ILES Inboard Leading Edge Station INSB INS Bus
ILL Illuminate, Illumination INSP Inspect, Inspection
ILLUM Illuminate, Illumination, Illuminated INSR Insert
ILLUMD Illuminated INST Instrument, Instruments
ILLUS Illustrate, Illustrator, Illustration INST Instrumentation
ILM Independent Landing Monitor INSTL Install, Installation
ILS Instrument Landing System INSTLLD Installed
ILSCP ILS Control Panel INSTM Instrumentation
IM Inner Marker (ILS) INSTR Instrument
IMBAL Imbalance INSTS Instruments
IMC Instrument Meteorological Conditions INST XFR Instrument Transfer
IML Inside Mold Line INSUL Insulate, Insulation, Insulator
IMM Immediate INT Interphone
IMMTE Integrated Mix Manifold Temperature Error INT Interior
IMP Impeller INT Internal
IMP Imperial INT Integral, Integrating
IMP Impact INT Intersection
IMP Impulse INT Interrupt
IMPATT Impact Avalanche and Transmit Time (diode) INT Intermittent
IMU Inertial Measurement Unit INT Intake
IN Inch, Inches INTC Interconnect
IN Inlet INTC Intercom
IN Inspection INTC Intercept
IN Input INTCHG Interchangeable
INA Initial Approach INTCM Intercom
INB Inbound INTERCOM Intercommunication (MD)
INBD Inboard INTCON Interconnection
INC Increase INTCP Intercept
INC Incorporated, Incorporation INTEG Integrator, Integration
INC Increment INTEN Intensity
INCL Including, Inclusive INTER Interrupt
INCLG Including INTERR Interrogation
INCLR Intercooler INTFC Interface
INCPT Intercept INTG Integral
INCR Increase INTGT Integrate
INCR Increment INTK Intake
IND Indicator INTL Internal
IND Indicate, Indicated INTL Initialize
INDEF Indefinite INTLC Interlock (MD)
INDEP Independent INTLK Interlock
INDG Indicating INTLKS Interlocks
INDUC Inductance INTMD Intermediate
INDUS Industrial INTMT Intermittent
INDX Index INTPH Interphone
INFC Interface INTR Interior
INFIS Inertial Navigation Flight Inspection System INTRG Interrogate, Interrogator
INFLT Inflight INTRO Introduction
INFO Information INTRP Interrupt
INH Inhibit INTRPT Interrupt
INHB Inhibit INTS Integrator Saturated
INHG Inches of Mercury INU Inertial Navigation Unit
IN HG Inches of Mercury INV Inverter
INHI Inhibit INV Invalid
INHIB Inhibit, Inhibition INWP Intermediate Waypoint
INIT Initialize, Initiate I/O Input/Output

26 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
I-OEU Inboard Overhead Electronics Unit IU Inertial Unit
IOM Inertial/Omega Mix IV Isolation Valve
IOM Input/Output Module IVASEB Integrated Video Audio Seat Electronics Box
IOP Input/Output Processor IVS Inertial Vertical Speed
IOR Immediate Operational Requirement IVS In-arm Video System
IP Intermediate Pressure IVSI Instantaneous Vertical Speed Indicator
IP Invoice Packing Card IVV Instantaneous Vertical Velocity
IP Impact Pressure I/W In Work
I/P Intercept Point I/W Interchangeable With (IPC)
I/P Intercept Profile IWWF Inter Woven Wire Fabric (787)
I/P Input
IPC Illustrated Parts Catalogue
IPCT Initial Provisioning Coordination Team
IPD Initial Provisioning Document
IPL Illustrated Parts List
IPS Inches Per Second
IPT Internal Pipe Thread (MD)
IPV Indicator Para Visual
IQI Image Quality Indicator
IR Infrared
I/R Interchange/ Replacement (787)
I&R Interchangeable and Replaceable (787)
IRD Interior Reconfiguration Document
IRMP Inertial Reference Mode Panel
IRMS Integrated Radio Management System
IRNG In Range
IRP Integrated Refueling Panel
IRQ Interrupt Request
IRREG Irregular
Irr.M Irritating Material
IRS Inertial Reference System
IRU Inertial Reference Unit
ISA International Standard Atmosphere
ISA ICAO Standard Atmosphere
ISA In Service Activities
ISAR In Service Activities Report
ISAT Integrated Shipping & Assembly Tooling (787)
ISB Inter System Bus
ISC Instrument Systems Corporation
ISC Industry Steering Committee
ISC Industry Subcommittee
ISDAS In-Service Data Acquisition System
ISDU Inertial System Display Unit
ISDU Inertial Sensor Display Unit
ISFD Integrated Standby Flight Display (787)
ISG Instrument Symbol Generator Unit
ISIS Integrated Standby Instrument System (MD)
ISLN Isolation
ISO Isolation
ISO International Standards Organization
ISO In-Service Occurrence Reports
ISOL Isolate, Isolated, Isolation
ISPA Inertial Smooth Pressure Altitude
ISR Integrated Surveillance Resource (787)
ISS Inboard Slat Station
ISS Inertial Sensor System
ISS Inertial Sensing System
ISS Issue
ISS Integrated Surveillance System (787)
ISSPU Integrated Surveillance System Processor Unit (787)
ISSS Instrument Source Select Switch
ISU Inertial Sensor Unit
ISV In-Seat Video (MD)
IT Interruption
ITAC Inertial Thrust Asymmetry Processor Unit (787)
ITEL Illustrated Tool and Equipment List
ITEM Illustrated Tool and Equipment Manual
ITT Interturbine Temperature

27 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
J Joule K Knot
JAA Joint Airworthiness Authorities K Kilo
JAM Jammed, Jamming K Thousand
JAMG Jamming K 1024
JAN Joint Air Force-Navy K Kelvin (degrees)
JAR Joint Airworthiness Requirements KAP Keep-Alive-Power
JAR Joint Airworthiness Regulatory KBAR Kilobar
JB Junction Box KC Kilocycle
J-BOX Junction Box KCAL Kilocalorie
JCT Junction KCAS Knots of Computed Airspeed
JETT Jettison KBD Keyboard
JFC Jet Fuel Control KE Kilocycle (MD)
JIT Just In Time KE Kinetic Energy (MD)
JK Jack KEAS Knots Equivalent Airspeed
JNL Journal KEV Kiloelectrovolt
JO Job Order Kg Kilogram
JOG Joggle KG Kilogram
JPR Jumper KG-CAL Kilogram-Calorie
JREMS Justified Removals KGH Kilograms per Hour
JS Jump Seat KG-M Kilogram-Meter
JT Joint KGPH Kilograms Per Hour
JTSN Jettison KGS Kilograms
KG-SEC Kilometers per Second
KHz Kilohertz
KIAS Knots Indicated Air Speed
KIP Kilopounds
KIP-FT Kilo Foot-pounds
KL Kiloliter
KM Kilometer
KM/SEC Kilometers per Second
KN Knot
KOHM Kilo Ohm
K PA Kilopascal
KRUG Kruger
KSI Kilopounds per Square Inch
KT Knot
KT Kiloton
KTS Knots
KV Kilo Volt
KVA Kilovolt-Amperes
KVAH Kilovolt Ampere Hour (MD)
KVAR Kilovolt-Amperes Reactive, Kilovar
KW Kilowatt
KWH Kilowatthour
KWHR Kilowatthour
KWR Kilowatts Reactive
KWS Kilowatts

28 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
L Left L/D Lift/Drag
L Length LDA Localizer-type-Directional Aid
L Liter LDG Landing
L Inductor LDG Landing Gear
L Low LDG Loading
L Lambert LDG GR Landing Gear
L Lumen LDI Landing Direction Indicator
LA Linear Accelerometer LDR Loader
LA Longitudinal Accelerometer unit LE Leading Edge
LA Lightning Arrestor LE Log Entry
LAB Laboratory L/E Leading Edge
LAC Local Area Controller LED Light Emitting Diode
LAG Lagging LED Leading Edge Devices
LAM Lateral Autopilot Module LED Leading Edge Down (MD)
LAM Laminate LEFDU Leading Edge Flap Drive Unit
LAM Landing Altitude Modifier (787) LE-FLP Leading Edge Flap
LAN Local Area Network LEMAC Leading Edge of Mean Aerodynamic Chord
LAS Lateral Autopilot Servo LEP List of Effected Pages
LAS Low Alloy Steel (MD) LES Leading Edge Station
LAT Latitude LE STA Leading Edge Station
LAT Lateral LEU Leading Edge Up (MD)
LATA Lateral Acceleration LEV Lever
LAT/ACC Lateral Accelerometer LF Left Front
LAT DEV Lateral Deviation LF Low Frequency
LATL Lateral LFEC Low Frequency Eddy Current
LAT REV Lateral Revise LFDS Large Format Display System
LAU Linear Accelerometer Unit LFFS Lower Front Spar Station
LAV Lavatory LFR Low Frequency Radio Range
LB Pound LFS Localizer Frequency Select
LB Left Body LFT Left
L-BAND .6 to 1.55 GigaHz frequency band LG Landing Gear
LBBL Left Body Buttock Line L/G Landing Gear
LB-FT Pound-Foot (Torque) LGA Landing Gear Cable "A"
LB-IN Pound-Inch LGA/NWS Landing Gear Actuation/Nose Wheel Steering (787)
LBL Left Buttock Line LGB Load Gearbox
LBLR Label Recognition LGBV Landing Gear By-pass Valve
LBP Left Bottom Plug LG CS Landing Gear Control Switch
LBS Lateral Beam Sensor LGE Lounge
LBS Pounds LGE Large
LBS/HR Pounds Per Hour LGND Legend
LBTR Left Bus Tie Relay LGT Light
LC Load Controller LGTS Lights
LC Labor Cost LGTV Landing Gear Transfer Valve
LC Lower Center LGW Landing Gross Weight
LCA Lateral Control Actuator LGWOW Left Gear Weight On Wheel
LCC Life Cycle Cost LH Left Hand
LCC Low pressure Case Cooling L-HR Lumin-Hour
LCCA Lateral Central Control Actuator LI Limit Indicator
LCD Liquid Crystal Display LI Left Inboard
LCD Large Cargo Door (787) LIB Left Inboard
LCDU Left Control Display Unit LIFO Last In First Out
LCF Low Cycle Fatigue LIM Limit, Limitation
LCF Large Cargo Freighter LIM Laser Intensity Monitor
LCH Latch LIMG Limiting
LCIT Load Compressor Inlet Temperature LIM SW Limit Switch
LCK Lock LIN Line
LCL Local LIN Linear
LCLU Landing Control Logic Unit L INBD Left Inboard
LCM Least Common Multiple LIN FT Linear Foot
LCM Logic Control Module LIQ Liquid
LCN Load Classification Number LIS Localizer Inertial Smoothing
LCPT Life Cycle Product Team LJ Locating Jig
LCR Left-Center-Right LK Lock
LCT Line Current Transformer LKD Locked
LCV Load Control Valve LKG Locking
LD Load LL Latitude & Longitude
LD Left Display LL Low Level
LD Loading Device (787) LL Lower Lobe

29 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
L/L Latitude & Longitude LPTACC Low Pressure Turbine Active Clearance Control
LLAC Low Level Alternating Current LPTC Low Pressure Turbine Cooling
LLAC Low Level AC voltage LP VALVE Low Pressure Valve
LLAR Lower Lobe Attendants Rest LPW Lumens Per Watt
LLDC Low Level Direct Current LR Left Rear
LLDC Low Level DC voltage LRC Long Range Cruise
LLG Lower Lobe Galley LRCU Landing Rollout Control Unit
LLS Left Line Select Key LRCS Long Range Communication System (787)
LLS Low-Level Solid Radioactive Material LRD Low Rate Discharge (787)
LLWAS Low Level Windshear Alerting System LRM Line Replaceable Module
LMC Least Material Condition LROPS Long Range Operations (787)
LMG Left Main Gear LRRA Low Range Radio Altimeter
LMM Localizer Middle Marker LRS Load Relief System
LMP Lamp LRU Line Replaceable Unit
LMP Left Middle Plug LS Line Select Key
LMT Local Mean Time LS Loudspeaker
LMTR Limiter LS Low Speed
LN Left Nose L/S Low Speed
LN Line Number LSA Low Specific Activity Radioactive Material
L/N Line Number LSA Low Speed Aileron
LNA Low Noise Amplifier LSAP Loadable Software Airplane Parts
LNAV Lateral Navigation LSAP Loadable Software Applications
L NAV Lateral Navigation LSB Lower Side Band
L-NAV Lateral Navigation LSB Least Significant Bit
LNG Long LSD Least Significant Digit
LNGW Long Word LSDA Low Speed Digital to Analog
LO Low LSDS Lavatory Smoke Detection System
LO Lock Out LSDU Load Selector Display Unit (MD)
LO Left Outboard LSI Large Scale Integration
LO Local Oscillator LSK Line Select Key
L/O Layout LSP Limit Select Panel
LO2 Liquid Oxygen LSP Low Speed
LOB Left Outboard LSP Loadable Software Part (787)
LOC Localizer LSPD Low Speed Digital to Analog
LOC Locate, Location LSR Load Shedding Relay
LOCI Loss of Conditioned Air Inflow (787) LSSW Left Strut Switch
LOCE Localizer Engaged LSU Lavatory Service Unit
LOCF Localizer Flag LT Light
LOD Load LT Left
LO FLO Low Flow LT Teleloading
LOG Logic LT Left Turn
LOG Logarithm LTD Limited
LOGO Logogram, Logographic LTG Lighting
LOM Localizer Outer Marker LTK Load Tonne Kilometre
LON Longitude LTL Loan Tool
LONG Longitude, Longitudinal LTP Left Top Plug
LONGN Longeron LTR Liter
LO PR Low Pressure LTR Letter
LOP Low Oil Pressure LTS Lights
LOP Log Of Pages LTSHLD Light Shield
LOPA Layout Of Passenger Accommodations LU Lubrication
LORAN Long Range Navigation LUB Lubricate
L OUTBD Left Outboard LUF Lower Usable Frequency
LO Z Low Impedance LV Low Voltage
LP Low Pressure LVDT Linear Variable Differential Transducer
LP Lightning Protector LVDT Linear Variable Differential Transformer
LP Loop LVDT Linear Velocity Differential Transducer
LP Low Pass LVDT Linear Voltage Displacement Transducer
L/P Low Pressure (787) LVL Level
LPA Loop A LVL/CH Level Change
LPB Loop B LVL CHG Level Change
LPC Low Pressure Compressor LVPS Low Voltage Power Supply
LPC Low Pressure Core LVR Lever
LP FCOC Low Pressure Fuel Cooled Oil Cooler LVR Louver
LPI Lateral Path Integrator LW Landing Weight
LPM Liters Per Minute LW Left Wing
LPO Landings Per Overhaul LW Locked Wheel (protection)
LPT Low Pressure Turbine L/W Lockwire

30 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
LWD Left Wing Down M Mach
LWM Lower Weather Minimums M Motor
LWR Lower M Maneuvering Speed (EFIS)
LWS Left Wing Station M Mode
L-x Lavatory-x M Magenta
M Meter
M Minus
M Magnetic
M Maintenance
M Milli
M Manifold
MA Milliamperes
MA Maintenance Annunciator
MA Master
MA Missed Approach
MAA Maximum Authorized IFR Altitude
MAC Mean Aerodynamic Chord
MAC Maximum Allowable Concentration
MADAR Malfunction Detection Analysis and Recording
Subsystem
MADU Multi-purpose Aids Display Unit
MAG Magnetic
MAG Magnetic Heading
MAG Magazine
MAG Magneto
MAG DEC Magnetic Declination
Mag.M Magnetized Material
MAGN Magnetron
MAG TRK Magnetic Track
MAG VAR Magnetic Variation
MAI Multiplexer Action Item
MAIDS Multipurpose Automatic Inspection and
Diagnostic System
MAIN Maintenance
MAIN MUX Main Multiplexer
MAINT Maintenance
MALF Malfunction
MALS Medium Intensity Approach Light System
MAN Manual
MANF Manifold
MAP Ground Mapping
MAP Master Annunciator Panel
MAP Multi-Acquisition Processor
MAP Missed Approach Point
MAP Manifold Absolute Pressure
MAP Mission Audio Panel
MAPSP Master Attendant Passenger Service Panel (MD)
MARS Maintenance Analysis and Reports Section
MAS Milli-Ampere/Seconds
MASI Mach and Airspeed Indicator
M/ASI Mach Airspeed Indicator
M-ASP Master Attendant Switch Panel (787)
MAT Maintenance Alert Time
MAT Maintenance Access Terminal
MA&T Master Auto and Test (787)
MATL Material
MATT Mobile Assembly Transport Tool (787)
MAWEA Modularized Avionics and Warning Electronics
Assembly
MAWP Missed Approach Waypoint
MAX Maximum
MAX< Maximum Angle (climb)
MAX CLB Maximum Climb
MaxD Maximum Damage Dimension (787)
MAX DES Maximum Descent
MAX END Maximum Endurance
MAX SPD Maximum Speed
MB Millibars

31 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
MB Marker Beacon MED Mode Engage Disable
M/B Metal Bond MED Medical
M/B Mother Board MEDB Model Engine Data Base
MBB Mode Bar Bias MEDC Main Engine Data Concentrator (787)
MBR Main Battery Relay MEK Methyl Ethyl Keytone
MBS Millibars MEKP Methyl Ethyl Keytone Peroxide
MC Master Change MEL Minimum Equipment List
MC Material Cost MEM Memory
MC Megacycle MEMS Micro Electro-Mechanical Sensor (787)
Mc Corrected Mach MENH Mechanical and Engine Handling
MCA Minimum Crossing Altitude MEP Mean Effective Pressure
MCA Minimum Control-Air (speed) MES Main Engine Strut
MCBF Mean Cycles Between Failures MES Main Engine Start
MCC Maintenance Control Center MESC Mid Electrical Service Center
MCD Magnetic Chip Detector MET Meteorological
MCD Master Control Drawing MEV Main Electro Valve
MCD Maintenance Control Display MEV Million Electron-Volts
MCDF Maintenance Control Display Function (787) MEW Manufacturers Empty Weight
MCDP Maintenance Control Display Panel MF Medium Frequencies
MCDU Multipurpose Control Display Unit MF Mach Feel
MCDU Multifunction Control Display Unit MFA Memorized Fault Annunciator
MCE Motor Control Enable MFC Mechanical Fuel Control
MCG Minimum Control-Ground (speed) MFD Multifunction Display
MCHENG Multi-Channel Engage MFD Manufactured
MCi Millicurie MFDS Manifold Failure Detection
MCL Maximum Climb (power) MFG Manufacturing
MCL Master Component List MFG/REC Manufacturers Recommendation (MD)
MCLM Microfilm MFK Multi Function Keypad (787)
MCP Mode Control Panel MF MOT Mach Feel Motor
MCP Maximum Continuous Power MFP Main Fuel Pump
MCP Modernization Commonality Program MFP Mixed Fission Products
MCP Main Control Panel (787) MFR Manufacturer
MCR Maximum Cruise MFR IDENT Manufacturer Identification
MCR Master Change Request MFST Manifest
MCR Maximum Cruise (power) MG Motor Generator
MCS Master Control Switch MG Milligram
MCT Maximum Continuous Thrust MGB Main Gear Box
MCU Modular Concept Unit MGCU Main (Landing) Gear Control Unit (787)
MCV Main Control Valve MGD Million Gallons per Day
MCW Modulated Continuous Wave MGMT Management
MD Minimum Descent Altitude MGOS Maintenance and Ground Operations Systems
M/D Main Deck MGR Manager
MDA Minimum Descent Altitude MGS Main Gear Switch
MDA Minimum Decision Altitude MGSCU Main Gear Steering Control Unit
MDAU Modular Data Acquisition Unit MGSS Main Gear Steering System
MDC McDonnell Douglas Corporation (MD) MGT Management
MDC Boeing Corporation (MD) MGTW Maximum Gross Taxi Weight
MDF Medium Frequency Direction Finding Station MH Millihenry
MDH Minimum Decision Height MHDG Magnetic Heading
MDI Master Dimensioning Index MHE Material Handling Equipment (787)
MDL Module MHR Magnetic Heading Reference
MDL Middle MHRS Magnetic Heading Reference System
MDLC Maneuvering Direct Lift Control MHSU Magnetic Heading Sensor Unit
MDM Medium (MD) MHTLM Multi-Head Contour Tape Laminating Machine (787)
MDR Maintenance Delay Report MHz Megahertz
MD&T Master Dim & Test MI Miles
MD/T Master Dim & Test MI Magnetic Indicator
MDU Multiplier Divider Unit MI Indicated Mach
ME Mechanical Equipment (tool) MIBK Methyl Isobutyl Keytone
MEA Minimum Enroute Altitude MIC Microphone
MEAS Measurement MICRO-P Microprocessor
MEC Main Equipment Center MID Middle
MEC Main Engine Control MIDO Manufacturing Inspection District Office
MEC Main Engine Controller MI/HR Miles per Hour
MECH Mechanic, Mechanical MIKE Microphone
MECH Mechanism MIL Military Specifications
MED Medium MIL-SPEC Military (part) Specifications
MED Main Entry Door MIL-STD Military Standards

32 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
MIN Minimum MONO Monaural
MIN Minute MOPS Minimum Operational Performance Standards
MIN ALT Minimum Altitude MOS Metal Oxide Semiconductor
MIN FUEL Minimum Fuel MOS Method of Shipment (Sonic)
MINS Minimums Mos Month(s) (MD)
MIN SPD Minimum Speed MOSFET Metallic Oxide Semiconductor Field Effect
MIN TIME Minimum Time Transistor
MIP Maintenance Information Printer MOSV Motor Operated Shutoff Valve
MIPO Manually Issued Purchase Order MOT Motor
MIPS Million Instructions Per Second (787) MOT Motion
MIS Maintenance Information System (787) MOU Memorandum Of Understanding
MISC Miscellaneous MP Maintenance Practices
MI/SEC Miles per Second MP Modification Proposal
MIST Machined Integral Shear Tie (787) MP Microprocessor
MIT Miscellaneous Tool MPA Maximum Power Assurance
MITP Metal In Tailpipe MPB Micro Processor Bipolar
MIX Mixed Present Position MPCB Main Power Circuit Breaker
MK Mark MPCS Minimum Pressure Control System
MKR Marker MPD Maintenance Planning Data
MKR BCN Marker Beacon MPD Maintenance Planning Document
ML Milli-Liter MPDTM Master Planning Document Task Masterfile
ML Milli-Lambert MPG Miles Per Gallon
M/L Material List MPH Miles Per Hour
MLA Maneuver Load Alleviation (787) MPL Maximum Permitted Life
MLD Molded MPLX Multiplexer
MLG Main Landing Gear MPR Multipurpose Register
MLGD Main Landing Gear Door (787) MPS Maximum Performance Specifications
MLGWW Main Landing Gear Wheel Well MPS Multiplex Power Supply
ML/O Metal Layout MPS Maintenance Programs Subcommittee (ATA)
MLS Microwave Landing System MPSOV Minimum Pressure and Shut-off Valve
MLU Monitor and Logic Unit MPU Magnetic Pickup
M&LU Monitor and Logic Unit MPU Magnetic Pickup Unit
MLW Maximum Landing Weight MPU Microprocessor Unit
MM Maintenance Manual MR Modification Revision
MM Maintenance Monitor MRA Minimum Reception Altitude
MM Middle Marker MRB Maintenance Review Board
MM Millimeter MRBPB Maintenance Review Board Policy Board (FAA)
MMAP Mission Maintenance Audio Panel MRC Maximum Range Cruise
MMC Maximum Material Condition MRR Mechanical Reliability Reports
MMEL Master Minimum Equipment List MRR Miscellaneous Retrofit Requirement
MMF Maintenance Module Fault (EIS Code) MRS Malfunction Reporting Systems
MMH/FH Maintenance Man Hours per Flight Hour MS Mid Spar
MMO Maximum Operating Mach MS Milliseconds
MMR Multimode Receiver MS Military Standard
M MUX Main Multiplexer M/S Mail Stop
MN Main M/S Modal Suppression
MN Minute M/S Mid Spar
MN Mach Number MSA Minimum Safe Altitude
MNFST Manifest MSAS Model Stability Augmentation System
MNL Manual MSB Most Significant Bit
MNPS Minimum Navigation Performance Specification MSC Multi Shield Connection
MNTD Mounted MSC Miscellaneous System Controller
MNVR Maneuver MSCM Miscellaneous Switching Control Module
MO Month MSD Most Significant Digit
MOA Make On Assembly MSD Multiple Site Damage
MOCA Minimum Obstruction Clearance Altitude MSDS Material Safety Data Sheet
MOD Module MSEC Milliseconds
MOD Modification, Modified M/SEC Meters per Second
MOD Modulator MSG Message
MOD Model MSG Maintenance Steering Group
MOH Measure Of Hardness MSG Maintenance Systems Guide
MOI Magneto Optic Imaging (MD) MSI Maintenance Significant Item
MOI Media of Inspection (787) MSI Medium Scale Integrated
MOL WT Molecular Weight MSL Microwave Landing System
MOM Momentary MSL Mean Sea Level
MOM Maximum Operating Mach (MD) MSL Maintenance Service Letter
MON Monitor, Monitored MSM Maintenance Schematic Manual
MONG Monitoring MS M Minutes Slew-Month

33 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
MSN Mission MV Multivibrator
MSP Mode Select Panel (EFIS) MV Metering Valve
M-SPD Manual Speed MV Mach Validity
MSS Mid Spar Station MVAR Magnetic Variation
MSS Mode Selector Switch MVP Moisture Vapor Proof
MST Master MVR Magnetic Variation
MSTCLR Master Clear MVT Movement
MSTR Master MW Milliwatt
MSU Mode Selector Unit M/W Mates With
MSU Magnetic Sensor Unit M/W Master Warning
MSW Microswitch MWARN Master Warning
MT Mach Trim MWC Master Warning Computer
MT Manual Trip MWC Main Wheel Circuit Card
MT Mount MWCC Master Warning Caution Controller
MT Maintenance Tip MWP Master Warning Panel
MT Magnetic Particle-Color Contrast (MD) MWS Master Warning System
MTA Mach Trim Actuator MX Multiplex
MTB Main Torque Box (787) MZFW Maximum Zero Fuel Weight
MTBCR Mean Time Between Confirmed Removal
MTBD Mean Time Between Defects
MTBF Mean Time Between Failure
MTBI Mean Time Between Inspection
MTBIFS Mean Time Between In Flight Shut-down
MTBPR Mean Time Between Premature Removals
MTBR Mean Time Between Removals
MTBT Mean Time Between Trouble
MTBUR Mean Time Between Unscheduled Removal
MTC Manual Trim Cancelling (787)
MTCHG Matching
MTD Manufacturing Technical Directive
MTE Manual Test Equipment
MTF Magnetic Particle-Fluorescent (MD)
MTF Maintenance Terminal Function (787)
MTG Miles To Go
MTG Muting
MTG Mounting
MTGC Mounting Center
MTGW Maximum Taxi Gross Weight
MTIP Maintenance Tip
MTL Minimum Triggering Level
MTL Minimum Threshold Level
MTN Motion
MTO Maximum Take Off (MD)
MTOGW Maximum Takeoff Gross Weight
MTOP Maintenance Task Operating Plan
MTOW Maximum Takeoff Weight
MTP Maintenance Test Panel
MTR Motor
MTR Meter
MTR Master Tool Record
MTRG Metering
MTRS Meters
MTS Mach Trim System
MTS Maintenance Training Simulator
MTTF Mean Time To Failure
MTTR Mean Time To Repair
MTTR Mean Time To Removal
MTW Maximum Taxi Weight
MTXW Maximum Taxi Weight
MU Management Unit
Mu Millimicron
MUF Maximum Usable Frequency
MUI Multiple Usage Item
MULT Multiple, Multiplication
MUS/VOL Music Volume
MUX Multiplex, Multiplexer
MV Magnetic Variation
MV Millivolt

34 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
N North NEUT Neutral, Neutralizing
N Normal NF National Fine/Thread (MD)
N Neon NFC Not Fully Closed
N Newton NFO Not Fully Open
N1 Engine Fan Speed NG Gas Generator RPM
N1 Low Pressure Compressor NGCU Nose (Landing) Gear Control Unit (787)
N1.D N1 Descent NGS Nitrogen Generation System (787)
N1.L N1 Latch NGT Night
N2 Engine Rotor Speed NGV Nozzle Guide Vanes
N2 Intermediate Pressure Compressor (RB211) NGWOW Nose Gear Weight On Wheel
N2 High Pressure Compressor (JT9D) Nh HP Compressor RPM
N2C Corrected N2 Speed NHA Next Higher Assembly
N3 High Pressure Compressor NI Not Interchangeable
NA Normal Accelerometer N/I Not Interchangeable
NA Not Applicable NICAD Nickel-Cadmium
NA Not Available NIL Engine Speed Limit
N/A Not Available NIM Network Interface Module (787)
N/A Not Applicable NITE Night
NAC Nacelle Nl LP Compressor RPM
NACA National Advisory Committee for Aeronautics NKL Nickel (MD)
NAC BL Nacelle Buttock Line NLG Nose Landing Gear
NAC STA Nacelle Station NLGIV Nose Landing Gear Isolation Valve (787)
NAC WL Nacelle Waterline NLGWW Nose Landing Gear Wheel Well
NAI Nacelle Anti-Ice NLT No Later Than
NAK No Acknowledgment NM Nautical Mile
NAM Nautical Air Miles Nm Moment (Newtonmeter)
NAM Normal Accelerometer Monitor NMI Nautical Mile
NAR No Action Required NMI Non Maskable Interrupt
NAS National Aerospace Standards N MI Nautical Mile
NAS National Aircraft Standards N MOS Negative Metal Oxide Semiconductor
NAS National Aeronautical Standards N MOS N-Channel Metal Oxide Semiconductor
NASA National Aeronautics and Space Administration NNC Non-Normal Checklist
NATL National NO Normally Open
NAUT Nautical NO Normal Operation
NAV Navigate, Navigation No. Number
NAV ADC Navigation Air Data Computer NOB Number One Bearing
NAVAID Navigation Aid NOM Nomenclature
NAV RAD Navigation Radio NOM Nominal
NBL Nacelle Buttock Line NOMEN Nomenclature
NBPT No Break Power Transfer (MD) NonflaG Non-Flammable Compressor Gas
NBR Number NON STD Non Standard
NBS National Bureau of Standards NOPT No Procedure Turn Required
NC Normally Closed NOR Normal
NC Not Connected, No Connection NOR Normal Operating Range
NC Numeric Control NORM Normal
NC Normal Checklist NOZ Nozzle
N/C Numerical Control NP Non Procurable
NCD No Computed Data NP New Part
NCFAL Non-Critical Fault Word Logic NP National Pipe (MD)
NCP Navigation Control Panel Np Propeller RPM
NCT Neutral Current Transformer N/P Next Page
NCU Navigation Control Unit N/P Nut Plate
NCU Navigation Computer Unit NPN Negative-Positive-Negative
NCV Navigation Computer Valid NPRM Notice of Proposed Rule Making
ND Navigation Display NPRV Negative Pressure Relief Valve (787)
ND Nose Down NPT National Taper Pipe (Thread)
ND Not Displayed (MD) Npt Power Turbine Speed
NDAR Newly Delivered Airplane Report NPV Net Present Value
NDB Non-Directional Beacon NR Nose Restraint
NDB Non-Directional Radio Beacon NRC Non-Routine Card
NDB Navigation Data Base NRM Normal
NDI Non-Destructive Inspection NRMP Non-Reversible Motor Pump
NDT Non-Destructive Test NRP Navigation Reference Point
NEA Nitrogen Enriched Air (787) NRW Net Recoverable Weight
NEC National Electrical Code NRZ Non-Return-to-Zero
NECS National Electrical Code Standards (MD) NRZM Non Return to Zero Modified
NEF National Extra Fine/Thread (MD) NS No Smoking
NEG Negative NS Network Switch (787)

35 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
NS Nickel Steel (MD) O Open
N/S New Subject O Orange
NSC Notice of Status Change O Operations
NSEC Nanoseconds O2 Oxygen
NSS Neutral Shift Sensor OAD Output Analog Discrete
NSTA Nacelle Station OAP Output Audio Processor
NSV Negative Sequence Voltage OAS Outer Air Seal
NTS Not To Scale OAT Outside Air Temperature
NTSB National Transportation Safety Board OB Outboard
NU Navigation Unit OBD Outboard (MD)
NU Not Used OBEDS Onboard Boeing Electronic Distribution of Software
NUM Numerical (787)
NV North Velocity OBJ Object
NVM Non-Volatile Memory OBJT Object
NVMEM Non-Volatile Memory OBS Observer
NVMEM RD Non-Volatile Memory Read Error OBS Omni Bearing Selector
NVMEM WR Non-Volatile Memory Write Error OBS Obsolete
NVRM Non-Volatile RAM OBSVR Observer
NW Nose Wheel OC Over Current
N/W Nose Wheel OC On Condition
NWG National Wire Gauge (MD) OC On Course
NWL Nacelle Waterline OC Order Card
NWS Nose Wheel Steering O/C On Course
NWSS Nose Wheel Steering System (787) O/C Open Circuit
NWW Nose Wheel Well (787) OCC Occupied
OCCPD Occupied
OCCPNT Occupant
OCL Obstacle Clearance Limit
OCS Obstacle Clearance Surface
OCT Octane
OD Outside Diameter
OD Out of Detent
O/D Out of Detent
ODAR Organizational Designated Airworthiness
Representative
ODLF Onboard Data Load Function (787)
ODMS Oil Debris Monitoring System (787)
ODN Open Data Network (787)
ODS Overheat Detection System (787)
OEA Oxygen Enriched Air (787)
OEM Original Equipment Manufacturer
OEU Overhead Electronics Unit
OEV Overboard Exhaust Valve
OEW Operating Empty Weight
OF Over Frequency
OF Overfull
OF Outside Force
OFAR Overhead Flight Attendant Rest (787)
OFCR Officer
OFCR Overhead Flight Crew Rest (787)
OFFR Off/Reset
OFF R Off-Reset
OFL Outflow
OFP Operational Flight Program
OFS Offset
OFSS Outboard Front Spar Station
OFST Offset
O/FULL Overfull
OFV Outflow Valve
OGV Outlet Guide Vane
OH Overheat
O/H Overheat
OHM Overhaul Manual
OHME Overhead Mechanical Equipment (tool)
OHMF Onboard Health Management Function (787)
OHU Overhead Unit
OIG Office of Inspector General
OJ Override Jettison (787)

36 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
O/J Override Jettison (787) OSM Onboard Storage Management (787)
OJMC Override Jettison Motor Controller (787) OSS Over Station Sensor
OJT On-the-Job Training OSS Outboard Slat Stations
OK Correct OSH Occupational Safety and Health
OLES Outboard Leading Edge Station OSU Overdoor Service Unit
OLS Oil Level Sensor OT Oil Temperature
OLW Operational Landing Weight O/T Over Temperature
OM Outer Marker OTOW Operational Take-Off Weight
OM Overhaul Manual OUT Outlet
OM Operations Manual OUT Output
OMB Operations Manual Bulletin OUTB Outboard
OML Outside Mold Line OUTBD Outboard
OMS Onboard Maintenance System OUTPT Output
OMT Online Maintenance Terminal (MD) OUTR Outer
OMTBF Observed Mean Time Between Failure OV Over
ON-ORD On Order (Sonic) OV Over Voltage
ONS Omega Navigation System OVBD Overboard
O-OEU Outboard Overhead Electronics Unit OVCO Over Voltage Cutout
OP Operational, Operation, Operating OVDR Over Door
OP Open Phase OVF Over Frequency
OP Open OVFL Overfill, Overflow
OP Oil Pressure OVHD Overhead
OP Operating Procedure OVHL Overhaul
OP Opalescent OVHT Overheat
OP Operational (check) OV/HT Overheat
O/P Output OVLD Overload
OP-AMP Operational Amplifier OVPRESS Overpressure
OPAS Overhead Panel ARINC System OVRD Override
OPBC Overhead Panel Bus Controller OVRHT Overheat
OPC Operational Program Configuration OVSP Overspeed
OP/C Operational Check OVV Overvoltage
OPER Operative, Operational OVWG Overwing
O/PFDV Other Pitch Flight Director Valid OW Outer Wing
OPN Operation OW One Way
OPNG Opening OWE Operating Weight Empty
OPP Opposite OXY Oxygen
OPR Operate Oxy M Oxidizing Material
OPR Operator OZ Ounce
OPRN Operation OZ-FT Ounce-Foot
OPS Operation, Operations OZ-IN Ounce-Inch (torque)
OPT Optimum
OPT Optical
OPT Option, Optional
OPTL Optional
OPV Overpressure Valve
OQAR Optical Quick Access Recorder (MD)
OR Overrotation
ORD Ordinance
ORD RCD Order Received (Sonic)
ORF Orifice
ORG Orange
ORG Organization
Org Per Organic Peroxide
ORIDE Override
O/RIDE Override
ORIG Origin, Original, Originator
ORN Orange
ORT Owners Requirements Table (software database)
ORZ Omni Range Zero
OS Over Station
OS Oversize
OS Out of Service
O/S Over Station
O/S Overspeed
O/S Oversize
OSC Oscillator, Oscillation
OSC Oscilloscope
OSG Oscillograph

37 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
P Primary PCAM Pitch Camout
P Panel P CAP Partial Glide Slope Capture
P Pressure PCB Printed Circuit Board
P Purple PCD1 Compressor Discharge Pressure-First Stage
P Pink PCD2 Compressor Discharge Pressure-Second Stage
P Pitch PCDU Power Conversion Distribution Unit (MD)
P Plus PCE Personal Consumption Expenditures
P Page PCF Passenger Cum Freighter
P Proprietary (MD) PCH Patch
P2 Inlet Air Pressure P.CLB Profile Climb
P5 Exhaust Gas Pressure PCM Pulse Code Modulation
P25 HPC Inlet Pressure PCM Power Conditioning Module
P49 HPT Exhaust Pressure PCM Power Control Module
P4.95 Turbine Exhaust Pressure PCMCIA Personal Computer Memory Card International
PA Passenger Address Association
PA Public Address P CMD Pitch Command Valid
PA Power Amplifier PCN Pavement Classification Number
Pa Pascal PCND Precondition Fail
PA AMP Passenger Address Amplifier PCP Power Control Package
PAC Passenger Address Controller PCP Pilot Call Panel
PACI Passenger Address & Crew Interphone PCR Publications Change Request
PA/CI Passenger Address/Cabin Interphone PCR Production Change Record
PAH Pitch Attitude Hold PCT Percent, Percentage
PAL Pressure Altitude PCU Power Control Unit
PAL Programmable Array Logic PCU Passenger Control Unit
PALCS Passenger Address Level Control Sensor PCU Propeller Control Unit
P.ALT Profile Altitude PCU Power Conditioning Unit
PAM Pitch Autopilot Module PCV Proportional Control Valve
PAM Pulse Amplitude Modulation PCW Pitch Control Wheel
PAM Performance Assessment Monitor PCWS Pitch Control Wheel Steering
PAMB Ambient Pressure PCZ Positive Zone Control
PAO Personal Air Outlet (787) PD Pitch Diameter
PAR Precision Approach Radar PD Datum Pressure
PAR Parallel PD Performance Data
PAR Periodic Activity Report PDB Performance Data Base
PARAM Parameter PDC Performance Data Computer
PARA/SER Parallel to Serial PDC Procurement Data Card
PARS Periodic Activity Reports PDCS Performance Data Computer System
PAS Passenger Address System PDDC Provisioning Descriptive Data Card
PAS Pitch Attitude Sensor (MD) P.DES Profile Descent
PASS Passenger PDHA Power Distribution Hosted Application (787)
PAT Pitch Attitude Trim PDI Pictorial Deviation Indicator
PA T/R Passenger Address Tape Reproducer PDIU Propulsion Discrete Interface Unit
PAX Passenger, Passengers PDL Portable Data Loader
PAX Passenger Announcement Entertainment and PDM Post Delivery Modification Material
Service Multiplex System PDOS Powered Door Opening System
PAX TEL Passenger Telephone PDP Power Distribution Panel
PB Burner Pressure PDRC Procurement Data Reference Card
PB Pushbutton PDS Primary Display System
P/B Pushbutton PDSV Pressure Drop and Spill Valve
PBACK Pushback PDT Pole Double Throw
PBE Protective Breathing Equipment PDU Power Drive Unit
PBE Personal Breathing Equipment PDU Pneumatic Drive Unit
PBI Polybenzimidazole PDU Pilot Display Unit
PBM Pressure Bias Modulation (antiskid) PE HP Stage Air Pressure
P/BSW Pushbutton Switch PE Purchased Equipment
PC Printed Circuit PECS Power Electronics Cooling System (787)
PC Packing Card PED Pedestal
PC Pitch Computer PED Portable Electronic Device
PC Control Pressure PED Personal Electronic Device
PC Pulsating Current PED Passenger Entry Door (787)
PC Production Certificate (FAA) PEEPLS Passenger Emergency Escape Path Lighting
PC Personal Computer System
P/C Printed Circuit PEKK Polyether Ketone Ketone (787)
P/C Percent PEL Permissible Exposure Limits
PCA Power Control Actuator PEM Performance Engineer's Manual
PCA Printed Circuit Assembly PEP Peak Envelope Power
PCA Positive Control Airspace PEPC Primary External Power Contactor

38 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
P.EPR Profile EPR PKG Package
PERC Percussion PKS Packs (air conditioning)
PERF Performance PL Place
PERF INT Performance Initialization PL Plate
PERM Permanent PL Plug
PERS Personnel PL Parts List
PES Passenger Entertainment System PL Pilot Landing
PES Production Engineering Specification PL Plan (MD)
PES Pitch Enhancement System P/L Payload
PETRO Petroleum PLA Power Lever Angle
PF Pitch Force PLA Programmed Logic Array
PF Pitch Feel PLAC Placard
PF Power Factor PLAT Programmed Lateral Assurance Test
PF Pulse Frequency PLAT Programmed Localizer Assurance Test
PF Pre Flight PLATF Platform
PF Profile PLD Payload
PF Pilot Flying PLF Present Leg Faults (CMC)
PF Package Freighter PLI Pitch Limit Indicator
pF Picofarad PLI Pitch Limit Indication
PFC Primary Flight Computer PLI Preload Indicating
PFCF Primary Flight Control Function (787) PLL Phase Lock Loop
PFCF Primary Flight Computer Function (787) PLN Plan
PFCS Primary Flight Control System PLNG Planning
PFCS Powered Flight Control Surfaces PLS Pulse
PFD Primary Flight Display PLSTC Plastic
PFD Preferred (MD) PLT Pilot
PFG Propylene-Glycol and Water (787) PLTS Pilots
PFI Post Flight Inspection PLYWD Plywood
PFO Parallel Feeder Open PM Phase Modulation
PF/T Preflight/Transit PM Permanent Magnet
PF TA Pitch Feel and Trim Assembly PM Pounds per Minute
PG Page PM Power Monitor
PG BUS Program Bus PM Manifold Pressure
PGM Program PM Plus or Munus (MD)
PH Phase PMA Permanent Magnet Alternator
PH Precipitation Hardening PMA Parts Manufacturer Approval (FAA)
PHD Pitch Hook Disengaged PMA Portable Maintenance Aid
PHE Pitch Hook Engaged PMA Primary Maintenance Aid (787)
PHI Bank Angle P.MACH Profile Mach
PHL Pitch Hook Limit PMAT Portable Maintenance Access Terminal
PHOS Phosphorescent (MD) PMB Plastic Media Blasting
PHP Pounds per Horsepower PMC Power Management Computer
PHR Pounds per Hour PMC Power Management Control
PHS Pitch Hook Sync PMC Power Management Controller
PHYS Physical PMC Performance Management Computer
PI Procedure Turn to an Intercept PMC Process Material Control
PI Performance Index PMD Programmable Memory Device
PI Production Illustration PMD Programmed Memory Device
PIA Peripheric Interface Adaptor PMDB Production Management Data Base
PIA Programmable Interface Adapter PME Portable Mechanical Equipment (tool)
PIC Product Identification Code PMG Permanent Magnet Generator
PIDS Primary Ice Detection System PMI Principle Maintenance Inspector (FAA)
PIE Pride In Excellence PML Precision Measurement Laboratory
PIIC Passenger In-flight Information Computer PMO Program Management Organization
PIMU Propulsion Interface Monitor Unit PMP Pump
PINT Pitch Integrator PMR Performance and Maintenance Recorder
PINT Integrated Pressure PMS Performance Management System
PIP Product Improvement Package PMUX Power Plant Multiplexer
PIR Pressure Interstage Return PMUX Propulsion Multiplexer
PIR Pump Interstage Regulator PN Part Number
PIREP Pilot's Report P/N Part Number
PIS Passenger Information Sign PN1 First Part Number (Sonic)
PIX Picture P.N1 Profile N1
PJTR Projector PN2 Second Part Number (Sonic)
PK Park PNC Part Number Code
PK Pink PNCS Performance Navigation Computer System
PK Pack PNEU Pneumatic
PKG Parking PNF Pilot Not Flying

39 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
PNFF Pitch No First Failure PRCS Processor
PNL Panel PRCSG Processing
PNP Positive-Negative-Positive PRCSR Processor
PNUTT Platform Not Up To Temperature PRE Protective Equipment
PO Outside Air Pressure PREAMP Preamplifier
PO Pickoff PRECIP Precipitation
PO Power On PRED Prediction
PO Purchase Order PRE-ENG Pre-Engage
PO Polarity PREFAB Prefabricated
Po Inlet Total Pressure PRE FLT Pre Flight
PODC Pneumatic Overheat Detection Controller (MD) PRELIM Preliminary
PODS Pneumatic Overheat Detection System PREP Prepare
POI Principle Operations Inspector PRES Present
POR Point Of Regulation PRES POS Present Position
POR Power On Reset PRESS Pressure, Pressurization
PORT Portable PRESS Pressure (MD)
POS Position PREV Previous
POS Positive PRF Pulse Rate Frequency
POS INT Position Initialization PRF Pulse Repetition Frequency
POSIT Position PRFM Performance
POSN Position PRG FLOW Program Flow error (MCDP)
POS REF Position Reference PRGM Program
POT Potentiometer PRG MEM ROM Memory error (MCDP)
POT W Potable Water PRI Primary
PP Power Plant PRIM Primary
PP Power Plant Pylon PRIN Principle
PP Peak to Peak PRL Parallel
PP Push-Pull PRL Parallel Rudder Logic
P/P Program Pin PRN Parts Requirement Notice
PPB Provisioning Parts Breakdown PRO Boeing Procedure
PPBL Power Plant Buttock Line PROC Procedure
PPBM Power Plant Buildup Manual PROC Processor
PPBU Power Plant Build Up PRO CAL Processed Comparator Autoland
PPC Phosphor Protection Circuit PROC T Procedure Turn
PPDC Provisioning Procurement Data Card PROD Production
PPDES Product Performance Data Exchange PROF Profile
Specifications PROG Progress
PPDS Primary Power Distribution System (787) PROG Program
PPH Pounds Per Hour PROJ Project, Projector
PPI Plan Position Indicator PROM Programmable Read Only Memory
PPK Power Plant Kit (MD) PROP Propellant
PPM Parts Per Million PROP Propeller (MD)
PPM Pounds Per Minute PROS Present Position
PPOS Present Position PROT Protection, Protective
PPR Paper PROT Protractor
P/P ROM Preprocessor ROM PROTN Protection
PPRV Positive Pressure Relief Valve (787) PROTO Prototype
PPS Power Plant Station PROV Provision
PPS Pilots Performance System PROX Proximity
PPS Pulses Per Second PRPHL Peripheral
PPS Precision Positioning Service (GPS) PRPHR Peripheral
PP/S Pulse Pairs per Second PRR Production Revision Record
PPWL Power Plant Water Line PRR Pulse Repetition Rate
PQAS Program Quality Assurance System PRR-R Production Revision Record, Retrofit only
PR Power Relay PRSM Pitch/Roll Servo System Monitor
PR Pressure PRSOV Pressure Regulating and Shut-Off Valve
PR Pair PRSODV Pressure Raising Shutoff and Dump Valve
PR Regulated Pressure PRSRZ Pressurize
PR Reference Pressure PRST Partial Reset
PR Pitch Rate P/RST Press to Reset, Push to Reset
PR Partial Revision PRSV Pressure Regulator & Shutoff Valve
PR Photorecorder PRT Partial Revision Telex
P/R Pitch Rate PRT Pulse Repetition Time
PRAM Prerecorded Announcement Machine PRV Pressure Regulating Valve
PRAM Prerecorded Announcement and Music PRV Pressure Relief Valve
PRBC Pressure Ratio Bleed Control PRV Pressure Reducing Valve
PRC Pressure Ratio Control PRVC Pressure Regulating Valve Controller
PRCLR Precooler PS Power Supply

40 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
PS Pressure Switch PTL Purchased Tool
PS Process Solution PTM Performance Training Manual
PS Pitot Static PTM Pilot Training Manual
Ps Static Pressure PT MOT Pitch Trim Motor
P/S Pitot/Static PTO Power Takeoff
P-S Parallel to Series PTP Protect The Product (MD)
PS2 Compressor Inlet Static Pressure PTR Printer
PS3 11th Stage Air Pressure PTR Push To Reset
PSA Power Supply Assembly PTT Push To Talk, Press to Talk
PSAMB Ambient Static Pressure PTT Push to Test, Press to Test
PSC Present Course PTU Power Transfer Unit
PSC Pneumatic System Controller PTU Power Transformer Unit
PSCL Predicted Safe Cycle Life PTW Pitch Trim Wheel
PSCP Project Specific Certification Plan (787) PTY Parity
PSD Process Specification Departure PU Pick Up
PSDC Proximity Sensing Data Concentrator (787) PU Panel Unit
PSE Principle Structural Element P/U Pick Up
PSEQ Phase Sequence PUB Publication
PSEU Proximity Switch Electronics Unit PUL Pulley
PSEU Proximity Sensor Electronics Unit PULV Pulverize, Pulverizer
PSF Pounds per Square Foot PUR Purple
PSFL Pressure Sensitive Flow Limiter PURS Purser
PSGR Passenger PV Priority Valve
PSH Pre-Select Heading PVA Polyvinyl Alcohol
PSH Present Heading PVB Polyvinyl Butyral
PSI Pounds per Square Inch PVC Polyvinyl Chloride
PSIA Pounds per Square Inch Absolute PVD Para Visual Display
PSID Pounds per Square Inch Differential PVD Para Visual Director
PSIG Pounds per Square Inch Gauge PVDC Para Visual Display Computer
PSM Power Supply Module PVIS Passenger Video Entertainment System
PSM Power Supply Monitor PW Pratt-Whitney
PSM Passenger Service Module PWGC Pulse Width Gain Control
PSN Position PWM Pulse Width Modulation
PSNR Positioner PWM Pulse Width Modulator
PSP Partnership for Safety Plan (787) PWR Power
PSPA Power Supply and Pulser Assembly PWR DR Power Drive
P.SPD Profile Speed PWR SPLY Power Supply
PSPL Peculiar Spare Parts List PWS Predictive Windshear
PSR Primary Surveillance Radar PYL Pylon
PSRAB Propulsion System Reliability Assessment Board PYRO Pyrotechnic
PSS Passenger Service System
PSS Proximity Switch System
PSTA Primary Stabilizer Trim Actuator
P-STATIC Precipitation Static (787)
PSU Passenger Service Unit
PSU Power Supply Unit
PSUD Passenger Service Unit Decoder
PSV Planned Shop Visit
PT Total Pressure
PT Point
PT Pint
PT Penetrant-Color Contrast (MD)
Pt Part
Pt Pitot, Pitot Pressure
PT2 Engine Inlet Pressure
PT2 Compressor Inlet Total Pressure
PT4.95 Exhaust Gas Pressure
PTA Power Transfer Actuator
PTC Pack Temperature Controller
PTC Positive Temperature Coefficient
PTCH Pitch
PT CODE Part Code
PTCTN Protection
PTDC Provisioning Technical Data Card
PTF Penetrant-Fluorescent (MD)
PTFE Polytetraflouroethane
PTH Path
PT I Pitch Trim Inhibit

41 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
Q Pitch Rate R Right
Q Torque R Red
QA Quality Assurance R Reset
QAD Quick Attach-Detach R Resistor
QAD Quick Adapter Disconnect (MD) R Yaw Rate
QAD Quick Access Disconnect R Roll
QAI Quality Assurance Item R Ramp
QAR Quick Access Recorder R Range
QC Quality Control R Radius
QC Quick Change R Rankine (degrees)
QC Quality Check R Repeat Interval
Qc Dynamic Pressure RA Radio Altitude
QCCR Quality Control Change Request RA Radio Altimeter
QCDS Quality Control and Distribution System RA Redundancy Assurance
QCE Quality Control Engineering RA Rain
QCR Quick Composite Repair (787) RA Resolution Advisory
QCR&D Quality Control Research and Development R/A Radar Altimeter
QCS Quiet Climb System (FMC) R/A Radio Altitude
QD Quick Disconnect RAA Responsibility Accountability Authority (787)
Q DISC Quick Disconnect RABS Reverse Actuated Bleed System
QDRNT Quadrant RAC Rules of the Air and Air Traffic Control
QDT Quadrantal RACON Radar Beacon
QE Quadrantal Error RAD Radio
QEC Quick Engine Change RAD Radial
QEC Quadrantal Error Correction RAD Radian
QEC Quadrantal Error Corrector RAD Radiation Dosage
QECU Quick Engine Change Unit RAD Roll Anticipation Distance
QFE Field Elevation Atmosphere Pressure RadM Radioactive Material
QFE Field Elevation Pressure RAE Ram Air Exit
QIC Quality Improvement Center RAEA Ram Air Exit Actuator
QNE Sea Level Standard Atmosphere Pressure RAF Ram Air Fan (787)
QNH Atmosphere Pressure at Sea Level R/AF Radio Altimeter Flag
QNH Baro Pressure Setting for in Route Altitude RAI Ram Air Inlet
QNH Destination Altimeter Setting RAIA Ram Air Inlet Actuator
QNH Sea Level Pressure (MD) RAIL Runway Alignment Indicator Light System
QPA Quantity of Parts per Airplane RAM Random Access Memory
QPL Qualified Products List RAP Repair Assessment Program
QPL Qualified Parts List RAPCON Radar Approach Control
Q-POT Pressure Potentiometer RA RT Radio Altimeter Receiver Transmitter
QPRI Qualitative Personnel Requirements Information RAT Ram Air Turbine
QQI Quantitative Quality Indicator RAT Ram Air Temperature
QRH Quick Reference Handbook RATG Repairs Assessment Task Group
QT Quart RAV Radio Altitude Valid
QTE Quote RAX Random Access Transfer Memory
QTR Quarter RB Right Body
QTS Quarts R/B Replaced By (IPC)
QTY Quantity RBA RMI Bearing Indicator
QTZ Quartz RBA Rigid Bus Assembly
QUAD Quadrant RBBL Right Body Buttock Line
QUAL Quality RBL Right Buttock Line
RBN Radio Beacon
RBP Right Bottom Plug
RBTR Right Bus Tie Relay
RC Roll Computer
RC Rate Comparator
RC Repetitive Chime
RC Rate of Change
RC Replacement Code
R/C Rate of Climb
RCAF Repeat Course Alpha Fail
RCAG Remote Center Air-to-Ground
RCAM Roll Camout
RCC Remote Charge Converter
RCCB Remote Controlled Circuit Breaker
RCD Recording
RCDR Recorder
RCDU Remote Control Display Unit
RCDU Right Control Display Unit

42 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
RCL Recall REJ Rejected, Rejection
RCLM Runway Center Line Marking REL Release
RCLS Runway Center Line Lift System REL Relief
RCM Ratio Changer Module REL Reluctance
RCMDE Roll Command Enable REL Relay
RCP Radio Communications Panel RELIAB Reliability
RCP Reverse Current Protection RELOC Relocate, Relocated
RCP Refuel Control Panel (787) REM Remote
RCPT Receptacle REM Remove
RCPTN Reception REM Roentgen Equivalent Man
RCV Receive REMS Removals (unscheduled)
RCVD Received REP Representative
RCVR Receiver REP Repellant
RCWS Roll Control Wheel Steering REP Reporting Point
RCVY Recovery REP Reproducer
RD Right Display REP Repair
RD Read REPEL Repellent
R/D Radial & Distance REPL Replace, Replacement
R/D Rate of Descent REPL BY Replaced By
R&D Research and Development REPRO Reproducer
RDC Remote Data Concentrator (787) REQ Require, Required
RDC Ramp Damage Checker (787) REQ Request, Requested, Requisition
RDDMI Radio Digital Distance Magnetic Indicator REQD Required
RDDMI Radio Digital Distance Measuring Indicator RES Reserve
RDF Radio Direction Finder RES Resistance, Resistor
RDG Reading RES Research
RDMI Radio Distance Magnetic Indicator RESP Response
RDNG Reading REST Restriction
RDP Roller Drive Power RESTR Restricted
RDR Radar RESV Reserve
RDR XMTR Radar Transmitter RESYNC Resynchronize, Resynchronization
RDS Radial Drive Shaft RET Retract
RDU Remote Data Unit (787) RET Retard
RDY Ready RETF Return to Field
RE Regarding RETR Retract, Retractable
RE Reynolds number RETRD Retracted
REAC Reactor RETRG Retracting
REC Record, Recorder RETRN Retraction
RECD Received REU Remote Electronics Unit
RECD Recorded REV Reverse
RECEPT Receptacle REV Reverser
RECIP Reciprocating REV Revise, Revision
RECIR Recirculation REV Revolution
RECIRC Recirculate, Recirculation REV Reversion
RECIRC Recirculating REW Rewind
RECM Recommend REW Recoverable Empty Weight
RECOG Recognition RF Radio Frequency
RECON Reconnaissance RF Right Front
RECOV Recovery RF Refill
RECP Receptacle RF Reference
RECT Rectifier RFC Request For Change
RECT Rectangle RFCC Reverse Flow Check Controller
RED Reduction RFCS RF Combiner/Splitter
REDUND Redundancy RFDA RF Distribution Amplifier
REF Refer, Reference RFI Radio Frequency Interference
REF ALIGN Reference Alignment RFL Refuel
REFL Reflected RFL Reflected
REFLD Reflected RFM Rotocraft Flight Manual
REFLNG Refueling RFMC Ram Fan Motor Controller (787)
REF PT Reference Point RFP Request For Proposal
REFRAC Refractory RFS Reason For Selection
REFRIG Refrigerate, Refrigeration RFS Regardless of Feature Size
REG Regulate, Regulator, Regulating RFU Radio Frequency Unit
REG Regulation RFW Request For Work
REG Register, Registry RGCU RAT Generator Control Unit (787)
REGEN Regenerative RGDS Regards
REIL Runway End Identification Lights RGLRD Regulated
REINF Reinforce RGLTD Regulated

43 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
RGLTG Regulating ROS Right Observers Station (MD)
RGLTN Regulation ROT Rotate, Rotation, Rotary
RGLTR Regulator RP Reverser Position
RGTR Register RP Reinstate Part
RGWOW Right Gear Weight On Wheel RPCM Rudder Power Control Module
RH Right Hand RPCP Rollout Power Control Package
RH Relative Humidity RPCU Rollout Power Control Unit
R/H Radar Height RPDR Reproducer
RHE Rudder Hook Engaged RPDS Remote Power Distribution System (787)
RHK Rudder Hook Monitor RPDU Regulator, Processor and Distribution Unit (787)
RHM Rudder Hook Monitor RPDU Remote Power Distribution Unit (787)
R/hr Roentgens per Hour RPG Report Program General
RI Right Inboard RPL Replace
RI Rate of Issue RPL Repellent
R/I Radio/Inertial RPLNT Repellent
R/I Remove/Install, Removal/Installation RPLS Replaces
R/I Repetitive Inspection RPLSD Replaced
RIB Right Inboard RPM Revolutions Per Minute
RINT Roll Integrator RPP Reflected Power Present
RIPS Recorder Independent Power Supply (787) RPS Revolutions Per Second
RIV Rivet RPTG Reporting
RJB Radio Junction Box RPTG Repeating
RK Rack RPTR Repeater
RK Repair Kit RPU Receiver Processor Unit
RLF Relief RQ Recommended Quantity
RLG Ring Laser Gyro RQMT Requirement
RLOC LOC Receiver RQRD Required
RLS Right Line Select key RR Rapid Revision
RLS Remote Light Sensor RR Right Rear
RLSE Release RR Rolls Royce
RLSED Released RR Radio Range Station
RLTD Related RR Rudder Rib
RLY Relay R/R Rho-Rho (DME-DME)
RLY/SW Relay/Switch R&R Remove and Replace
RM Room RRAM Receiver RAM
RM Reversion Mode RRC Rudder Ratio Changer
RM Raw Material RRC Rudder Rollout Control
RMCU Remote Magnetic Compensation Unit RRCA Rudder Ratio Changer Actuator
RMG Right Main Gear RRCBV Rudder Ratio Changer Bypass Valve
RMI Radio Magnetic Indicator RRCM Rudder Ratio Changer Module
RMM Ramp Maintenance Manual R RR Roll plus Roll Rate
RMP Right Middle Plug RS Rear Spar
RMP Reversible Motor Pump (MD) RS Resolver
RMP ENG Rudder Mod Piston Engaged RS Reserve
RMS Root Mean Square RS Restoration
RMT Remote RS Repeating Stroke
RMTE Remote R/S Rear Spar
RMT OUT High-Speed ARINC Output RSA Request for Service Allowance
RMU Remote Management Unit RSA Request for Support Allowance
RN Right Nose RSC Recording System Controlling
RNAV Radio Navigation RSE Roll Servo Engaged
R NAV Radio Navigation RSIV Reserve Steering Isolation Valve (787)
RNG Ring RSL Rudder Stop Limiter
RNG Range RSP Responder Beacon
RNI Radio Navigation Indicator RSP Rotational Sampling Program
RNP Required Navigation Performance (FMC) RSPL Recommended Spare Parts List
RO Right Outboard RSR Route Surveillance Radar
RO Rollout RSRV Reserve
RO Repair Order RSS Rear Spar Station
R/O Rho-Rho (DME-DME) RSS Root Sum Square
R/O Rollout RS STA Rear Spar Station
RO ALT Rollout Altitude RSSW Right Strut Switch
ROB Right Outboard RST Reset
ROLT Reorder Lead Time RSU Raster Shading Unit
ROM Read Only Memory RSU Remote Sensor Unit (787)
ROM Rollout Mode RSV Reserve
RON Remain Overnight RSVD Reserved
RO PCU Rollout Power Control Unit RSVR Reservoir

44 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
RSVR Resolver RWS Right Wing Station
RT Receiver-Transmitter RWS Reactive Windshear (787)
RT Right RWY Runway
RT Right Turn RZ Return-to-Zero
RT Route
RT Rate
RT Rejection Tag
RT Round Trip
RT X-Ray Radiography (MD)
R/T Receiver-Transmitter
R/T Rate of Turn
R/T Radio Transmit
R/T Reverse Thrust
RTA Receiver Transmitter Arinc
RTA Required Time of Arrival
RTC Real Time Clock
RTC Reduced Temperature Configuration
RTCA Radio Technical Commission for Aeronautics
RTE Route
RTF Radio Telephony
RTG Rating
RTG Gamma-Ray radiography (MD)
RTG1 Rating (engine) 1
RTG2 Rating (engine) 2
RTK Revenue Ton Kilometer
RTL Reverse Thrust Lever
RTL Reverse Thrust Limit
RTL Reverse Thrust Limiter
RTL Rental Tool
RTL Ready To Load
RTM Resin Transfer Molding (787)
RTM Receiver Transmitter Module (787)
RTN Return
RTNR Retainer
RTO Rejected Takeoff, Refused Takeoff
RTP Right Top Plug
RTP Radio Tuning Panel
RTRN Return
RTRSW Rotary Switch
RTRY Rotary
RTS Return To Seat
RTS Return To Service
RTV Room Temperature Vulcanizing
RTZ Return to Zero (MD)
RUC Recommended Use Code
RUD Rudder
RUD STA Rudder Station
RUE Repeat Update Excessive
RV Rollout Valid
RV Relief Valve
RVA Reverser Actuator
RVDT Rotary Variable Differential Transformer
RVDT Rotary Variable Differential Transducer
RVE Repeat Velocity Excessive
RVR Runway Visual Range
RVS Reverse, Reverser
RVSM Reduced Vertical Separation Minimum
RVSN Reversion
RVSR Reverser
RVT Rivet
RW Right Wing
RW Runway
R/W Read/Write
RWD Right Wing Down
RWI Read/Write Interface
RW/ILS Runway ILS
RWK Rework
R/W MEM RAM Memory

45 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
S South SCP Spoiler Control Package
S Second SCP Stabilizer Chord Plane
S Secondary SCP System Cargo Panel
S Minimum Slat Retract Speed (EFIS) SCR Silicon Controlled Rectifier
S Stringer SCR Screw
SA Single Aisle SCR Specification Change Request
SAARU Secondary Attitude Air Data Reference Unit SCRN Screen
SAC Single Annular Combuster SCS Speed Command System
SACO Seattle Aircraft Certification Office (FAA) SCS Speed Control System
SAE Society of Automotive Engineers SCS Single Channel Simplex
SAETG Structural Audit Evaluation Task Group SCSH Structural Carbon Steel Hard (MD)
SAF Safety SCSM Structural Carbon Steel Medium (MD)
SAFD Safetied SCSS Structural Carbon Steel Soft (MD)
SAI Standby Attitude Indicator SCSV Speed Control System Valid
SAL Salvage SCT Status Change Telex
SALS Short Approach Light System SCT Supersonic Commercial Transport
SALV Salvage SCU Seat Control Unit
SAM Stabilizer Trim & Aileron Lockout Module (767) SCU Start Control Unit
SAM Stabilizer/Elevator Asymmetry Module (757) SCU Signal Conditioner Unit
SAP Special Audio Panel SCU Supplemental Control Unit
SAS Stabilization Augmentation System SCU Starter Converter Unit
SAT Static Air Temperature SCU Supplemental Cooling Unit (787)
SAT Saturate SCUP Scupper
SAT Standard Air Temperature (MD) SCV Surge Control Valve
SATCOM Satellite Communication SD System Display
SAV Starter Air Valve SD Shutdown (engine)
SB Service Bulletin SD Side Display
SB Switch Box S/D Step Descent
SB Side Band S/D Shutdown
S/B Speed Brake S/D Stock Depleted
SBE Service Bulletin Engineering SDAC System Data Analog Converter
S/BELT Seat Belt SDAU Special Data Acquisition Unit
SBEW Standard Basic Empty Weight SDB Seat Data Box (787)
SBHM Static Balance Hinge Moment SSCA Short Form Design Change Agreement (787)
SBL Symbol SDCP System Display (MD)
SBT Service Bulletin Telex SDD System Description Document
SC Single Chime SDF Standard Data File
SC Scale SDI Source/Destination Identifier
SC Status Change SDI Source Data Identifier
SC Speed Control Computer SDL Software Data Loader
SC Stock Code (Sonic) SDM Speaker Drive Module
S/C Speed Command SDN System Description Note
S/C Step Climb SDP System Display Panel
S/C Service Check (MD) SDR Service Difficulty Report
SCAV Scavenge, Scavenger SDS Shop Distribution Standards
SCC System Control Center SDTM Structure Description Training Manual
SCC Station Control Card SDU Satellite Data Unit
SCC Signal Consolidation Card SE Special Equipment (tool)
SCC Stress Corrosion Cracking SE Slat Extend (MD)
SCD Specification Control Drawing SEB Seat Electronic Box
SCD Subject to Captains Discretion SEB/ST Seat Electronics Box with Self Test
SCD Supplier Control Document (787) SEC Seconds
SCE Source SEC Secondary
SCF Standard Cubic Foot SEC Section
SCFM Standard Cubic Feet per Minute SEC Secant
SCFS Standard Cubic Feet per Second SEC Service Extender Concentrate (oil filter)
SCH Schematic SEC-FT Second-Foot
SCH Schedule SECT Section
SCH Search SECU Spoiler Electronic Control Unit (MD)
SCHED Schedule SEG Segment
SCHEM Schematic SEI Standby Engine Indicator
SCID Signal Collection/Tail ID Card SEI Standby Engine Instrument
SCIU Surveillance Camera Interface Unit (787) SEL Select, Selected, Selection
SCIU Security Camera Interface Unit (787) SEL Selector
SCM Spoiler Control Module SELCAL Selective Calling
SCN Specification Change Notice SELCAL Selective Call System
SCO Section Control SEL FROM Selected From
SCO Section Controller SEL PNL Selector Panel

46 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
SELTR Selector SIF Selective Identification Feature
SEM Short Edge Margin SIG Signal
SEM Scanning Electron Microscope SIIA Structural Item Interim Advisory
SEM Standard Electronic Terminal (MD) SIL Service Information Letter
SEM Standard Electronic Module (MD) SIL Silence
SEN Sensor SIL Systems Integrated Lab
SENS Sensitivity SIM Simulation
SENS Sense SIM System Interface Module
SEPC Secondary External Power Contactor SIN Sine
SEQ Sequence SIP Service Interphone
SER Service SIR Service Information Release
SER Serial SIRS Significant Item Reporting System
SERNO Serial Number SIS Service Interphone System
SER/PRL Serial to Parallel SIS Service Item Summary
SERV Service SISP Source Input Select Panel
SERV INT Service Interphone SIT Situation
SERVO Servomechanism SIV Standard Item Variations
SERVO CTL Servo Control SKED Schedule
SET Seat Electronic Terminal (MD) SKT Socket
SEU Seat Electronics Unit SL Service Letter
SF Spot Face SL Sea Level
S/F Spot Face SL Slat
SFAR Special Federal Aviation Regulation (FAA) S/L Service Letter
SFC Specific Fuel Consumption SLAMMR Side-Looking Airborne Modular Multimission
SFCC Slat/Flap Control Computer Radar
SFCC Sideways Facing Crew Cockpit SLAR Side-Looking Airborne Radar
SFCC Sideways Facing Crew Configuration SLAT STA Slat Station
SFD Source-to-Film Distance SLCTD Selected
SFE Seller Furnished Equipment SLCTR Selector
SFENA Societe Francaise D'Equipments Pour La SLFPM Sea Level Feet Per Minute
Navigation Aerienne SLI Since Last Inspection
SFM Surface Feet per Minute SLP Space Limited Payload
SFPI Slat/Flap Position Indicator SLS Side Lobe Suppression
SFPM Surface Feet Per Minute SLS Sea Level Static
SG Symbol Generator SL SB Slat Switch Box
SG Signal Generator SLST Sea Level Static Thrust
SG Stroke Generator SLT Slat
SG Strain Gauge SLV Sleeve
SGML Standard Generalized Markup Language SM Splice
SGP Stroke Generator Processor SMA Stress Methods and Allowables
SGSEL Suggested Ground Support Equipment List SMC Stall Management Computer
SGU Symbol Generator Unit SMCU Squib Monitor Control Unit (787)
SH Sheet SMD Surface Mounted Device
S/H Sample and Hold SME Shipping Mechanical Equipment (tool)
SH ABS Shock Absorber SMHGA Side Mounted High Gain Antenna
SHDBL Sheddable SMK Smoke
SHED Shedding SMM Stall Margin Mode
SHF Super High Frequency SMPG Structural Maintenance Planning Guidelines
SHI Standby Horizon Indicator SMT Software Management Tool (787)
SHK Shank SMV Speed Mode Valid
SHKR Shaker SMV Speedbrake Mode Valve
SHLD Shield SMYD Stall Management Yaw Damper
SHLD Shielding SMYDC Stall Management Yaw Damper Computer
SHM Structural Health Monitoring (787) SN Serial Number
SHN Scratch Hardness Number SN Sign
SHP Shaft Horsepower S/N Serial Number
SHPR Shipper SNGL Single
SHPT Shipment SNIF Sensitivity for Normal Interface
SHP TO Shipped To (Sonic) SNR Signal-to-Noise Ratio
SHRD Shroud SNS Standby Navigation System
SHT Short SNS Sensor
SHT Sheet SNSR Sensor
SHTW Short Word SO Shut-Off
SHVR Shaver SO Second Officer
SI Slip Indicator S/O Shut-Off
SID Standard Instrument Departure S/O Second Officer
SIDS Standard Instrument Departures SOB Side-Of-Body
SIDS Standard Instrument Departure Sequence SOC Start OF Climb

47 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
SOH Start Of Heading SPT Static Procedures Trainer
SOL Solenoid SPU Start Power Unit
SOL V Solenoid Valve SPUB Start Power Unit Breaker (787)
SONIC Spares Ordering Nonstop Inventory Control SPUC Start Power Unit Contactor (787)
SOP Standard Operating Procedure SQ Square
SOP Service Operating Procedure SQ Squelch
SOP Standard Option Pin SQ CM Square Centimeter
SOP Standard Overhaul Practices SQ FT Square Feet
SOPM Standard Overhaul Practices Manual SQ-FT Square-Feet
SOSP Structures Operator Support Program SQ IN Square Inch
SOSV Solenoid Operated Shutoff Valve (MD) SQ KM Square Kilometer
SOT Start Of Transmission SQL Squelch
SOTM System Operation Training Manual SQ M Square Meter
SOV Shutoff Valve SQ MI Square Mile
SOW Statement Of Work SQ MM Square Millimeter
SP Splice SQRTM Same Qualified Resin Transfer Moulding (787)
SP Scratch Pad SQ u Square Micron
SP Summing Point SQW Square Wave
SP Speed SQ YD Square Yard
SP Sampling SR Senior
SP Space SR Spherical Radius
SP Stop SR Slat Retrack (MD)
SP Special Performance SRA Specific Range Air
SP Single Pole (MD) SRAM Static Random Access Memory
SPAD Scratch Pad SRCH Search
SPASE Single Point Audio System Earth SRD Software Requirements Document
SPBK Speed Brake SRE Surveillance Radar Element of GCA
SPC Statistical Process Control SREU Spoiler Remote Electronics Unit (787)
SPD Speed SRF Solvent Resistant Finish
SPD Surfaces Position Digitizer SRF Self Relieving Filter
SPD BK Speed Brake SRKM Structural Repair Kit Manual
SPDBRK Speed Brake SRL Significant Rework Log
SPD/M Speed/Mach SRM Structural Repair Manual
SPDT Single Pole Double Throw SRM Stabilizer Trim/Rudder Ratio Module
SPDU Secondary Power Distribution Unit (787) SRP Service Related Problem
SPE Seller Purchased Equipment SRS Speed Reference System
SPEC Specification SRU Shop Repairable Unit
SPF Specific Pathogen Free SRU Shop Replaceable Unit
SPF/DB Super Plastic Forming and Diffusion Bonding (787) SRV Servicing
SPFK Specific SRVO Servo
SPG Spring SS Single Shot
SP GR Specific Gravity SS Slow Slew
SP HT Specific Heat SS Stick Shaker
SPI Surface Position Indicator SS Slat Station
SPI Special Position Identification SS Stainless Steel
SPKR Speaker SS Suggested Spare
SPKRS Speakers SS Sky/Shading
SPL Spoiler SSALS Simplified Short Approach Light System
SPL Splice SSALSR Simplified Short Approach Light System Runway
SPL Splice List Alignment Lights
SPLC Splice SSB Split System Breaker
SPLR Spoiler SSB Single Side Band
SPLY Supply SSB Supplier Service Bulletin
SPM Stabilizer Position Module SSB System Startup Box
SPM Surface Position Monitor SSC Static Source Correction
SPMC Service Process Material Control SSC Single Stroke Chime
SPNC Single Pole Normally Closed SSCVR Solid State Cockpit Voice Recorder
SPNO Single Pole Normally Open SSD Significant Structural Detail
SPOP Service Process Operation Procedure SSD Source Select Discrete
SPR Servo Pressure Regulator SSEC Static Source Error Correction
SPR Service and Performance Report SSFD Signal Selection Fault Detection
SPR Suppression SSFDR Solid State Flight Data Recorder
SPRC Safety Performance Review Committee SSG Single Stroke Gong
SPRS Suppression SSI Structural Significant Item
SPS Service Process Solution SSI Supplemental Structural Inspection
SPS Single Point Sensor SSI Stocked Specialty Item
SPS Standard Positioning Service (GPS) SSID Supplemental Structural Inspection Document
SPST Single Pole Single Throw SSIP Supplemental Structural Inspection Program

48 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
SSIS Significant Service Item Summary STRUCT Structure
SSLCV Synch Shaft Lock Control Valve STS Status, System Status
SSM Servo System Monitor STS Speed Trim System
SSM Sign Status Matrix STVC Standby Temperature Control Valve
SSM System Schematics Manual STWG Stowage (MD)
SS M Slow Slew, Month (clock) STWL Stairwell
SSP Source Select Panel (MD) STWY Stairway
SSPA-PS Solid State Power Amplifier- Power Supply (787) STX Data To Follow
SSPC Solid State Power Controller (787) SU Switching Unit
SSPL Structural Spare Parts List SUBASSY Subassembly
SSR Secondary Surveillance Radar SUBCONT Subcontract, Subcontractor
SSR Solid State Relay SUBJ Subject
SSSV Solid State Stored Voice SUBMUX Submultiplexer
SST Supersonic Transport SUBS Subsequent
SSW Strut Switch SUD Stretched Upper Deck
SSWP Signal Swap SUFF Suffix
ST Start SUM Summing
ST Standard Tool SUP Supply
ST Status Code (Sonic) SUP Support
ST Single Throw (MD) SUPL Supply
STA Station SUP-NUM Supernumerary
STA Stationary SUPP Supplemental
STA Straight-in-Approach SUPPL Supplement, Supplemental
STA Stabilizer Trim Actuator SUPPR Suppressor
STAB Stabilizer SUPPR Suppression
STAB Stabilized SUPSD Superseded
STAB Stabilization SUPSD BY Superseded By
STAB BL Stabilizer Buttock Line SUPT Support
STAB STA Stabilizer Station SUR Surge
STAN Stanchion SUR Surface
STAR Standard Terminal Arrival Route SURF Surface
STAT Status SURV Surveillance
STAT Static SV Solenoid Valve
STAT Statistic SV Servo Valve
STB Boeing Part Standards SV Servicing
STBD Starboard SVA Stator Vane Actuator
STBY Standby SVA Stator Vane Angle
STC Sensitivity Time Control SVC Service
STC Servo Test Complete SVCE Service
STC Supplemental Type Certificate (FAA) SVD Seat Video Display
STCM Stabilizer Trim Control Module SVMTR Servomotor
STD Standard SVO Servo
STE System Test Equipment SVS Vertical Speed Sync
STE Special Test Equipment SVS Synthetic Vision System (787)
STE Simplified Trailing Edge (787) SVU Seat Video Unit
STFS Structures Task Forces SW Switch
STG Structures Task Group S/W Software
STGR Stringer SWC Stall Warning Computer
STIF Stiffener SWG Switching
STIFF Stiffener SWG Structures Working Group
STIM Stimulus SWITCH IN Switch Input
ST INV Static Inverter SWL Sidewall
STIU Stabilizer Trim Interface Unit SWLT Switchlight
STL Steel SW/LT Switch-Light
STLM Stabilizer Trim Limit Switch SWMC Stall Warning Management Computer
STLM Stringer Laminating Machine (787) SWP Sweep
STL WARN Stall Warning SWR Standing Wave Ratio
STM Severe Turbulence Mitigation (787) SWS Switches
STOL Short Takeoff and Landing SWS Software Sales
STOM System Operation Training Manual SWTG Switching
STP Step SWY Stopway
STP Surge Tank Protection SYM Symmetrical
STP Stamp SYM Symbol
STR Stringer SYM GEN Symbol Generator
STR Structural SYN Synchronize
STRG Steering SYN Synthetic
STRL Structural SYN Synchro
STRN Straighten SYNC Synchro

49 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
SYNC Synchronize, Synchronous T True
SYNC Synchronization T Turn
SYN/DIG Synchronous Digital T Time
SYN REF Synchro Reference T Temperature
SYNTH Synthesizer T2 Inlet Total Temperature
SYNTH Synthetic (MD) T2 Fan Inlet Temperature
SYNTHR Synthesizer T2C HP Compressor Inlet Temperature
SYS System T4.95 Turbine Exhaust Temperature
SYST System T54 Low Pressure Turbine Inlet Temperature
TA Twin Aisle
TA Trim Assembly
TA Trim Augmentation
TA Traffic Advisory
TA Taxi (out)
TAB Test and Bite Panel
TAB Tabulate, Tabulation
TAC Trim Augmentation Computer
TAC Tactical
TAC Thrust Asymmetry Compensation
TACAN Tactical Air Navigation
TACH Tachometer
TACT Tactical
TAD Telegraphic Airworthiness Directive
TAES Transport Airplane and Engine Subcommittee
TAFCU Timed Acceleration Fuel Control Unit
TAI Thermal Anti-Ice
TAN Tangent
TAN Total Acid Number
TAP Total Air Pressure
TA PM Trim Augmentation Power Monitor
TAPS Twin Annular Pre-mixing Swirler (787)
TAR Terminal Area Surveillance Radar
TAS True Airspeed
TAS/SAT True Air Speed / Static Air Temperature (MD)
TAS V True Airspeed Valid
TAT Total Air Temperature
TAWS Terrain Awareness and Warning System (787)
TB Terminal Block
TB Tie Breaker
TB Transient Bleed (787)
TBA To Be Announced
TBB Transfer Bus Breaker
TBC The Boeing Company
TBD To Be Determined
TBDP Tie Bus Differential Protection
TBE Tetrabromoethane
TBF To Be Furnished
TBO Time Between Overhaul
TBS To Be Supplied (787)
TBS Tailored Business Stream (787)
TBSV Time Between Scheduled Visits
TBU Time Base Unit
TBV Turbine Bypass Valve
TBV Transient Bleed Valve
TBV To Be Verified (787)
TC Test Complete
TC Thermocouple
TC Turn Coordination
TC Turbine Case
TC Time Constant
TC Type Certificate (FAA)
T/C Top of Climb
T/C Thermocouple
T/C Turbo Compressor
TC1 Turbine Cooling Air
TCA Turbine Cooling Air
TCA Terminal Control Area
TCAS Traffic Alert and Collision Avoidance System

50 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
TCAS Traffic Collision and Avoidance System TF Fan (air) Temperature
TCB Thermal Circuit Breaker (787) T/F Track of a Fixed waypoint
TCC Thrust Control Computer TFC Traffic
TCC Turbine Case Cooling TFE Teflon
TCC Turbine Clearance Control TFR Transfer
TCCA Turbine Clearance Control Air TFR Technical Focus Reports
TCCS Thrust Control Computer System TFU Transient Fuel Unit
TCCV Turbine Clearance Control Valve TFU Technical Follow Up
TCF Trim, Centering and Feel Unit TFV Transient Fuel Valve
TCF Terrain Clearance Floor TG Tail Gear
TCFN Two's Complement Fractional Notation TGB Transfer Gearbox
TCL Turn Coordinator Left TGL Touch-and-Go Landing
TCM Technical Coordination Meeting TGT Turbine Gas Temperature
TCM Thrust Control Module TGT Target
TCMA Thrust Control Malfunction Accommodation (787) TH True Heading
TCP Tuning & Control Panel (787) THD Thread
TCPS Temperature Compensated Pressure Switch THEO Theoretical
TCS Temperature Control System (787) THEOD Theodolite
TCTO Time Compliance Technical Order THERM Thermal
TCV Temperature Control Valve THERM Thermometer
TD Time Delay THERMO Thermostat
TD Technical Directive THETA Temperature and Pressure
TD Turbine Driven THK Think
TD Touch Down THKNS Thickness (MD)
TD Test Data THMS Thermistor
TD Trim Down (MD) T/HOLD Throttle Hold
T/D Top of Descent THP Thrust Horsepower
T/D Time Delay THR Thrust
T/D Time/Distance THR Throttle
T*D Top of Descent THR HLD Throttle Hold
TDA Trim Down Arm THR HOLD Throttle Hold
TDC Trim Down Control THRM Thermal
TDC Time Delay Closing THR MGT Thrust Management
TDL Time Delay Logic THROT Throttle
TDM Tooling Design Manual THR REF Thrust Reference
TDO Time Delay Opening THR REV Thrust Reverser
TDP Touch Down Protection THRSH Threshold
TDP Touchdown Point THRST Thrust
TDR Torque Differential Receiver THRU Through
TDR Time Domain Reflectometer THS Trim Horizontal Stabilizer
TDU Time Display Unit THSHD Threshold
TDX Torque Differential Transmitter TI Texas Instruments
TDY Temporary Duty TI Track to an Interrupt
TDZL Touchdown Zone Lights TI Taxi In
TE Trailing Edge TI Transported Interface
TE Turbulence Engaged Ti Titanium
TE Test Equipment TIA Type Inspection Authorization
TE HP Stage Air Temperature TIE Bus Tie
T/E Trailing Edge TIM Time
TE ANN Turbulence Engaged Annunciation TIP Tune In Progress
TEC Turbine Exhaust Case TIR Type Inspection Report
TEC Turbine Exhaust Cone TIS Time In Service
TECH Technical TIS-B Traffic Information Services - Broadcast (787)
TED Trailing Edge Down (MD) TIT Turbine Inlet Temperature
TEL Telephone TJP Turbo Jet Propulsion (MD)
TEL Trailing Edge Left TK Track
TELE Telephone TK Track Angle
TEM Temperature TK Turn Knob
TEMP Temperature TK Tank
TEMP Test and Evaluation Master Plan T/K Turn Knob
TENS Tension TKE Track Angle Error
TEO Engine Oil Temperature TKE Track Error
TER Trailing Edge Right TKID Turn Knob In Detent
TERM Terminal TKS Thanks
TERMN Termination TL Tilt
TEST SIG Test Signal TL Transmittal Letter
TEU Trailing Edge Up (MD) TL Track Lock (787)
TEVC Trailing Edge Variable Camber (787) TLA Throttle Lever Angle

51 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
TLA Thrust Lever Angle TPU Transient Power Unit
TLB Technical Log Book TR Transformer Rectifier
TLM Telemeter TR Thrust Reverser
TLM Tape Laminating Machine (787) TR Temporary Revision
TLR Thrust Lever Resolver TR Truss
TLSE Terminal Lug Sensing Elements TR Turn Radius
TLT Thrust Lever Travel TR Transistor
TLW Tail Wind TR Regulated Temperature
TM Thrust Management TR Torque Receiver
TM Torque Motor TR Transit (check)
TM Manifold Temperature TR Trusting Rating (MD)
TMA Thrust Mode Annunciator T/R Transformer Rectifier
TMC Thrust Management Computer T/R Thrust Reverser
TMCF Thrust Management Computing Function T/R Transmit-Receive
TMCS Thrust Management Computer System T/R Thrust Beam
TME Thrust Management Engaged T-R Transmitter-Receiver
TME Transportable Mechanical Equipment (tool) T-R Transformer-Rectifier
TMF Turbine Mid-Frame TRA Thrust Resolver Angle
TMF Thrust Management Function TRA Throttle Resolver Angle
TMG Timing TRACON Terminal Radar Control
TMIGA Top-Mounted Intermediate Gain Antenna TRAJ Trajectory
TMP Temperature TRAN Transfer
TMR Timer TRANS Transit, Transition
TMS Thrust Management System TRANS Transfer
TMS Thrust Management Select TRANS Transformer
TMSP Thrust Mode Select Panel TRANS Transient Control
TO Takeoff TRANS Transport
TO Turn-Off TRANSF Transfer
TO Technical Order TRANSF Transformer
To Total Inlet Temperature TRANSV Transverse
T/O Take-Off TRAS Thrust Reverser Actuating System
TO/APPR Take-Off/Approach TRC Thrust Rating Computer
TOBI Tangential On Board Injection TRC Thermatic Rotor Control
TOC Top Of Climb TRDE Trade
TOCWS Takeoff Configuration Warning System TRF Transfer
TOD Top of Descent TRF Turbine Rear Frame
TOD Take-Off Dry TRF Tuned Radio Frequency
TOD Take-Off Distance TRI Triple
TOD Task Oriented Data TRIG Trigger
TOE Takeoff Engaged TRIM V Trim System Valid
TOE ANN Takeoff Engaged Annunciation TRK Truck
TOGA Take-Off Go Around TRK Track
TO/GA Takeoff Go-Around TRNBKL Turnbuckle
TOGW Take-Off Gross Weight TROPO Tropopause
TOL Tolerance TRP Thrust Rating Panel
TOP Takeoff Power TRPL Triple
TOR Take-Off Run TRQ Torque
TOR Torque TRQR Torquer
TORQ Torque TRS Transformer Rectifiers
TOS Turbine Overspeed TRS Technical Repercussion Sheet
TOSC Turn On Self Check TRSM Thrust Reverser Sequencing Mechanism
TOT Total TRT Turn Round Time
TOW Take-Off Weight TRT Takeoff Rated Thrust (MD)
TOW Take-Off Wet TRU Transformer Rectifier Unit
TP Test Point TRU True
TP Thrust Select Panel TRUN Trunnion
TP True Position TRV Travel
TP Top Plug TRWL Thrust Reverser Water Line
TP Tangent Point TS Terminal Strip
TP Type (WDM) TS Trouble Shooting
T-P Turn Point TS Temperature Switch
TPI Tire Pressure Indicator/transducer (MD) TS Tensile Strength
TPIS Tire Pressure Indication System TS Test Set
TPMU Tire Pressure Monitor Unit TS Tool Steel (MD)
TP&P Technical Policies and Procedures T/S Terminal Strip
TPR Transponder TSA Test Set Airplane
TPRSOS Trim Air Pressure Regulating and Shutoff Valve TSC Troubleshooting Chart
TPU Transient Pressure Unit TSC Torque Signal Conditioner

52 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
TSFC Thrust Specific Fuel Consumption u Micro
TSJ Test Jig UA Unit Assembly
TSL Terminal Strip List UAC Upper Area Control Center
TSLSV Time Since Last Shop Visit UARRSI Universal Aerial Refueling Receptacle System
TSM Trouble Shooting Manual Installation
TSO Time Since Overhaul UART Universal Asynchronous Receiver Transmitter
TSO Technical Service Order UART Universal Asynchronous Receive/Transmit
TSO Technical Standard Order (FAA) UB Utility Bus
TSS Test Set Station UB Unit Bond
TST Test UBR Utility Bus Relay
TSTR Transistor UC Upper Center
TT Total Time UCM Uncommanded Movement
TT Total Temperature UCT Universal Coordinated Time
TT Term Type U/D Upper Deck
TT Switching Temperature of HP Valve UDC Upper Deck Cargo
TT Tool Tag UDL Unit Detail Listing
TT Terminal Type UDT Update
TT Torque Test (MD) UF Under Frequency
TT2 Engine Inlet Temperature UFDR Universal Flight Data Recorder
TTG Time To Go U/FLOOR Underfloor
TTL Transistor Transistor Logic UFOB Usable Fuel On Board (MD)
TTL Total UHF Ultra High Frequency
TTL Tuned To Localizer UI Unit Issue
TTP Time Triggered Protocol - Electrical Power (787) UKCAA British Civil Aviation Authority
TTR Technical Trouble Report UL Uplink (787)
TTU Through Transmission Ultrasonic ULB Underwater Locator Beacon
TUA Trim Up Arm ULBBC Underwater Locator Beacon Battery Change (MD)
TUC Trim Up Control ULC Universal Logic Card
TUN Tuning ULD Unit Load Device
TUNE Tuner ULD Underwater Locating Device
TUNG Tungsten (MD) UM Unit Manufacture
TURB Turbulence UM Unit of Measure (Sonic)
TURB Turbine UMC Universal Master Caution
TURBO ALT Turbo Alternator (MD) UNBAL Unbalance
TURBO GEN Turbo Generator/Driver (MD) UNCPLG Uncoupling
TURBL Turbulence, Turbulent UNCRCTD Uncorrected
TV Television UND Under
TVB Turbine Bypass Valve UNIV Universal
TVBA Turbine Vane and Blade Cooling Air UNK Unknown
TVBC Turbine Vane and Blade Cooling UNK Unknown Element (MD)
TVBCA Turbine Vane and Blade Cooling Air UNLK Unlock
TVC Turbine Vane Cooling UNLKD Unlocked
TVOR Terminal VOR UNP Unknown from Production surplus
TVOR Terminal Variable Omni-Range (MD) UNREG Unregulated
TW Twisted UNRGLTD Unregulated
T/W Together With (IPC) UNSCHD Unscheduled
TWB Translating Wire Bundle (787) UNSCHED Unscheduled
T/WIND Tail Wind UNSD Unused
TWLU Terminal Wireless LAN Unit (787) UNSHD Unscheduled
TWR Tower U/O Used On
TWS Technical Work Statement UP Upper
TWT Traveling Wave Tube UPDT Update
TWX Teletype Written Exchange UP/LT Up Left
TWY Taxiway UPR Upper
TX Transmitter UR Utilization Rate
TX Torque Transmitter UR Unsatisfactory Report
TXPDR Transponder URR Unscheduled Removal Rate
TY Type (WDM) US Under Speed
TYP Typical US United States
TZ Tin-Zinc U/S Unserviceable
USB Upper Side Band
uSEC Microsecond
USG U.S. Gallons
USG Unusually Significant (service bulletin)
USG United States Cage (MD)
USS United States Standard (MD)
USPHS U.S. Public Health Service
UT Unit Time

53 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
UTC Coordinated Universal Time V Volt, Voltage
UTC Ultrahigh Frequency (MD) V Valve
UTC Universal Time Coordinated (MD) V Velocity
UTIL Utility V Version
UTL Ultrasonic-L Wave (MD) V Violet
UTR Ultrasonic- Surface (90 Rayleigh) (MD) V Voice
UTS Ultrasonic-Shear Wave (MD) V Vendor
UUT Unit Under Test V1 Takeoff Decision Speed
UV Under Voltage V1 Critical Engine Failure Speed
UV Ultra-Violet V2 Scheduled Target Speed
UVEROM Ultra Violet Erasable Read Only Memory V2 Takeoff Safety Speed
UV PROM Ultra Violet Programmable Read Only Memory V2min Minimum Takeoff Safety Speed
UWY Upper Airway V3 Flap Retraction Speed
V4 Slat Retraction Speed
Va Design Maneuvering Speed
VA Volts-Amperes
VA Heading with an Altitude Termination
VAC Volts Alternating Current
VAC Vacuum
V AC Volts Alternating Current
VAL Valve
VALU Value
VAP Visual Approach Procedure
VAR Variation, Variable
VAR Reactive Volt Ampere
VAR Visual-Aural Radio Range
VAR/WX Variable Weather (mode)
VASIS Visual Approach Slope Indicator System
VB Design Speed for Maximum Gust Intensity
VB Vertical Bearing
V/B Vertical Beam
VBFLO Initial Buffet Onset Speed (low)
VBM Variable Bypass Valve (MD)
VBS Vertical Beam Sensor
VBV Variable (bleed) Bypass Valve
VBV Variable Bleed Valve
VBVS Variable (bleed) Bypass Valves
Vc Calibrated Airspeed
VC Design Cruising Speed
VC Variable Camber
V/C Vendor Code
VCA Volts Direct Current (MD)
VCC Video Control Center (MD)
VCD Vortex Control Device
VCDU Video Control Distribution Unit
VCE Voice
VCK Variable Camber Krueger (787)
VCO Voltage Controlled Oscillator
VCP Video Control Panel
VCS Video Control Station (787)
VTCU Variable Camber Trim Unit (787)
VCU Video Control Unit (MD)
VCU Valve Control Unit (787)
VD Design Diving Speed
VD VOR/DME
VD Heading to a DME Distance
VDA Variable Diffuser Actuator (787)
VDC Volts Direct Current
V DC Volts Direct Current
VDCU Video Distribution Control Unit
VDCU Video Display Control Unit
VDD Version Description Drawing
VDEV Vertical Deviation
VDF VHF Direction Finding Station
VDL VHF Data Link (787)
VDR VHF Data Radio
VDU Video Distribution Unit
VE Velocity East

54 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
VEF Critical Engine Failure Speed VMOMMO Maximum Operating Limit Speed
VEH Vehicle VMS Minimum Selectable Speed
VEL Velocity VMS Via Maintenance System (MD)
VEND Vendor VMU Minimum Unstick Speed
VENT Ventilate, Ventilation VMU Video Monitor Unit
VEP Video Entertainment Player VMU Video Modulator Unit
VERT Vertical VNAV Vertical Navigation
VERT ACC Vertical Acceleration V NAV Vertical Navigation
VERT REV Vertical Revise V/NAV Vertical Navigation
VERT SPD Vertical Speed VNE Never-Exceed Speed
VES Video Entertainment System VNE Vertical Nav Engaged
VF Design Flap Speed VNS Vertical Nav Select
VF Video Frequency VNV Vertical Nav Valid
VF Variable Frequency (787) VO Voice
VFE Maximum Flap Extended Speed VOL Volume
VFO Variable Frequency Oscillator (MD) VOLT Voltage
VFR Visual Flight Rules VOM Volt Ohm Meter
VSFG Variable Frequency Starter Generators (787) VOR VHF Omnidirectional Range
VFTO Final Take Off Velocity VOR VHF Omnirange Station
VFTO Final Take Off Speed VOR Very High Frequency Omni-Directional and Radio
VFY Verify range
VG Vertical Gyro VOR.D VOR.DME
VGH Velocity-Gravity-Height VORE VOR Engaged
VGH Vertical Gust History VOR LOC VOR Localizer
VGS Vertical Gust Suppression (787) VOR/LOC VOR/Localizer
VGV Vertical Gyro Valid VORTAC VOR and TACAN Co-Located
VH Maximum Speed in Level Flight with Maximum VOT Voter
Continuous Power VOX Voice
VHF Very High Frequency V-PATH Vertical Path
VHS Video Helical Scan VPI Vertical Path Integrator
VHV Very High Voltage VPI Vapor Phase Inhibitor
VI Heading to an Intercept VPLC Valve Position Logic Card
VIA Versatile Integrated Avionics (MD) Vr Rotation Speed
VIB Vibration VR Voltage Regulator
VIB Initial Buffet Velocity VR Voice Recorder
VID Video V/R Voltage Regulator
VIGV Variable Inlet Guide Vanes V REF Landing Reference Speed
VIO Violet VREF Reference Speed
VIP Very Important Person VR-HDG Heading to a Radial
VIS Visual VRMS Volts Root Mean Square
VIU Video Interface Unit VRTA Vertical Acceleration
VIU Valve Interface Unit (787) VS Vertical Speed
V/L VOR/Localizer VS Verses
VLA Very Low Attutude (MD) Vs Stall Speed
VL CAPT VOR/LOC Capture V/S Vertical Speed
VLCT Very Large Commercial Transport VS1 Minimum Steady Flight Speed obtained in a
VLD Valid Specified Configuration
VLE Landing Gear Extended Speed VSBN Vendor Service Bulletin Number
VLF Very Low Frequency VSBT Vendor Service Bulletin Title
VLLDC Very Low Level DC Voltage VSCF Variable Speed Constant Frequency
VLMTRC Volumetric VSCU Video System Control Unit
VLO Landing Gear Operating Speed VSD Vertical Situation Display
VLOF Lift-off Speed VSE Vertical Speed Engaged
VLR Very Low Range (MD) VSEL Selected-Approach Speed (autothrottle)
VLTGE Voltage VSI Vertical Speed Indicator
VLV Valve VSMF Visual Search Microfilm Files
VM Maneuvering Speed VSO Volumetric Shut Off
VM Heading with a Manual Termination VSO Minimum Steady Flight Speed in the Landing
Vm Minimum recommended Maneuvering Speed Configuration
Vmax Maximum Operating Speed V-SPD Vertical Speed
VMBE Maximum Brake Energy Speed VSS Stick Shaker Speed
VMC Minimum Control Speed (with one engine VSS Vertical Speed Select
inoperative) V/STOL Vertical/Short Takeoff and Landing
VMC Visual Meteorogical Conditions VSV Variable Stator Vane
VMCA Minimum Control Airspeed VSVS Variable Stator Vanes
VMCG Minimum Control Ground Speed VSWR Voltage Standing Wave Ratio
V MIN Minimum Operating Speed VT Visual Aided (MD)
VMO Maximum Operating Velocity VTK Vertical Track

55 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
VTK Vertical Track Error W West
VTNA Variable Turbine Nozzle Actuator (MD) W White
VTO Volumetric Top Off W Wing
VTO Vertical Takeoff W Watts
VTOL Vertical Takeoff and Landing W Weight
VTR Video Tape Reproducer W Wire
VTR Video Tape Recorder W Width
VTR Variable Takeoff Rating W Warm
VTVM Vacuum Tube Voltmeter WA Wind Angle
VTY Vanity W/A Wraparound
VX Speed of Best Angle of Climb WACS Warning And Caution System
VY Speed for Best Rate of Climb WAF Wafer
WARN Warning
WAY PT Waypoint
W/B Wire Bundle
WBA Wire Bundle Assembly
WBC Weight and Balance Computer
WBL Wing Buttock Line
WBM Weight and Balance Manual
WBRR Wire Bundle Revision Report
WBS Weight and Balance System
WBS Work Breakdown Structure
WC Wording Change
W/CHAIR Wheelchair
WCP Wing Chord Plane
WCS Wing Center Station
WCU Waste Control Unit
WCU Wireless Control Unit (Lighting) (787)
WD Wind Direction
WD Word
WD Warning Display
WD Wing Datum
WD Wheels Down
W/D Wiring Diagram
WDI Wind Direction Indicator
WDIR Wind Direction
WDM Wiring Diagram Manual
WDO Window
WDO HT Window Heat
WEA Weather
WEA RDR Weather Radar
WELS Wireless Emergency Lighting System (787)
WEM Warning Electronics Module
WES Warning Electronics System
WEU Warning Electronics Unit
WFC Widespread Fatigue Cracking
WFD Widespread Fatigue Damage
WG Wing
WG Wave Guide
WG Working Group
WGAP Word Gap
WGD Windshield Guidance Display
WGDC Windshield Guidance Display Computer
WGDS Windshield Guidance Display System
WG SW Wave Guide Switch
WGT Weight
WH Wheel
WH Watt-hour
WHCS Window Heat Control System
WHCU Window Heat Control Unit
WHCU-L Window Heat Control Unit-Left
WHCU-R Window Heat Control Unit-Right
WHL Wheel
WHLS Wheels
WHT White
WIPCU Wing Ice Protection Control Unit (787)
WIPS Wing Ice Protection System (787)
WIRC Warning-Inhibition-Recall-Clear

56 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
WIU Wiring Integration Unit X Cross
WIU Wheel Interface Unit XARM Cross Arm
WL Water Line XBAR Crossbar
WLDP Warning Light Display Panel X-BLD Cross Bleed
WLG Wing Landing Gear X-CH Cross Channel
WLP Weight Limited Payload X-CHAN Cross Channel
WM Wiring Diagram Manual XCPN Exception
WM Wattmeter XCVR Transceiver
WMBPV Windmill Bypass Valve XDCR Transducer
WND Wind XDUCR Transducer
WNDSHR Windshear XFD Cross Feed
WO Washout XFEED Cross Feed
W/O Washout X FEED Cross Feed
W/O Without X-FEED Cross Feed
WOR Wear Out Rate XFER Transfer
WOW Weight On Wheels XFM Transformer
WP Waypoint XFMR Transformer
WPT Waypoint XFR Transfer
WR Weather Radar XLOC LOC Receiver Yaw Axis
WR Write X LINE Crossline
WR Word Rate XLTR Translator
W/R Weather Radar XMISSION Transmission
WRN Warn, Warning XMIT Transmit
WRL Wing Reference Line XMITTER Transmitter
WRP Wing Reference Plane XMSN Transmission
WRS Wire Release System XMTG Transmitting
WS Wind Speed XMTING Transmitting
WS Wing Station XMTR Transmitter
WS Wind Shear XNT Transient
W/S Wind Shield XPC External Power Contactor
W/S Wind Shear XPDR Transponder
W/S Will Ship XPNDR Transponder
WSC Windshear Computer XREF Cross Reference
WSCP Warning and System Control Panel XSECT Cross Section
WSDP Warning and System Display XSTR Transistor
WSHLD Wind Shield XTAL Crystal
WSPD Wind Speed X-TALK Cross-Talk
WSS Wing Spar Station XTK Cross Track
WSSG Warning System Symbol Generator XTK Cross Track Distance
WSTA Wing Station XTK Cross Track Deviation
W STA Wing Station XTK Cross Track Error
WT Weight XTKA Cross Track Acceleration
W/T Wing Tip XUL Hook-Up List
WTAI Wing Thermal Anti Ice X VALVE Cross Valve
WTAIS Wing Thermal Anti-Ice System
WTB Wing Tip Brake
WTBF Wing To Body Fairing (787)
WTC Wire Type Code
WTG Waiting
WTR Water
WTS Wing Tip Station
WU Wheels Up
WUC Work Unit Cost
W/V Wind Direction Speed
WW Wheel Well
W/W Wheel Well
WX Weather
WX Weather Radar
WXR Weather Radar
WX+T Weather Turbulence (mode)
WYPT Waypoint

57 REV. APR 2009

 BOEING AIRCRAFT ABBREVIATIONS & ACRONYMS
Y Yellow
Y Yaw
YAW DMPR Yaw Damper
YC Tourist Class
YC Yaw Computer
YCAM Yaw Camout
YCF Economy Class-Front
YCR Economy Class-Rear
YD Yard
Y/D Yaw Damper
YD ACT Yaw Damper Actuator
YDM Yaw Damper Module
YDS Yaw Damper System
YEL Yellow
YES Yankee Escape System
YINT Yaw Integrator
YNFF Yaw No First Failure
YR Year
Y/RATE Yaw Rate
YRG Yaw Rate Gyro
YSM Yaw Damper/Stabilizer Trim Module
YSSM Yaw Servo System Monitor
YTOM Yaw Takeoff Mode

Z Zulu Time (GMT)

Z Impedance
Z Zone
ZCU Zonal Control Unit
ZDL Zone Division Logic
ZFW Zero Fuel Weight
ZFWCG Zero Fuel Weight Center of Gravity (MD)
ZIA Zone Integration Area
ZIU Zone Integration Unit
ZMU Zone Management Unit
ZN Zone
ZNI2 Zinc Iodide
ZP Pressure Altitude
ZPC Zone Power Converter
ZPC Zone Power Controller
Zpi Indicated Pressure Altitude
ZR Zirconium
ZRF Zero Fuel Weight
ZTC Zone Temperature Controller

2PH Two Phase (MD)

2WAY Two Way (MD)
3P Three Pole (MD)
3P Triple Pole (MD)
3T Triple Throw (MD)
3WAY Three Way (MD)

58 REV. APR 2009