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MIL-C-81774A

9
23 lfarrh 1973
SUFESSEOIX
llIL-c-81774@s)
MILITARY SPECIFICATION 1 July 1970
CONTROL PANEL, AIRCRAFT,

, GENERAL REQUIREMENTS FOR

This spaclfication is approved for use by all Dapartmmts

,;”
}
“. 1. SCOPE
and Agenciee of tha Department of Dafenee.

+ I
1.1 purpose - This specification covers the general requirements

.’? for control panels for aircrew stations in military aircraft. The term “aircraft
“i.mntrol panel” as used herein includes the backing plate, the lighted panel,
fasteners, markings, ffnish, nomenclature, controls, control guards, aml
displays.

1.2 Application - l%is specification delineates documents for

,..-”” the design of control panels; establishes display and control selectfon, utilization
and arrangement; end provfdes for verification data of these requirements
I
2. APPLICABLE DOCUMENTS

2.1 The following documents, of the fesue fn effect on date of

fnvttation for bide or request for proposal, form a part of thfe specification
to the extent specified herein.

SPECIFICATIONS

Military
—
MIL-S-3950 , Swftches, Toggle

MIL-D-5480 Data, Engfneerfng and Technical,

Reprocfuctfon Requfremente for

MIL-S-5594 Swftch, Toggle, Electrically Trippable

MIL-C-6781 Control Panel, Aircraft Equipment, Rack or

Console Mounted

I
MIL-E-7080 Electric Equipment, Aircraft, Selection
and Installation of

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Fsc 1680

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SPECIFICATIONS

Military (Continued)

I MIL-G-7703 Guard, Switch

MIL-P-7788 Panels, Information, Integrally Illuminated

.1
I MIL-D-851O Drawings, Undimensioned, Reproducible, .,
Photographic and Contact, Preparation of
,,.
\ MIL-I-8700 Installaqon and Test of Electronic Equipment “1
in Aircraft, General Specification for

MIL-H-881O Handles, “Control, Aircraft

MIL-C-14806 Coating, Reflection Reductng, for Instrument

Cover Glasses and Lighttng Wedges

MIL-M-18012 Markings for Aircrew Station Displays, Design

and Configuration of

MIL-S-22885 Switch, Pushbutton, Illuminated, General

Specifieatton For

MIL-S-24317 Switches, Multistation, Pushbutton, @luminated

and Non-IUumfnated) General Speclficdton for

MIL-K-25049 Knobs, Control. Equipment, %ircraft

MIL-C-25050 Colors, Aeronautical Lighte and Lighting

Equipmtmt, (leneral Reqoirementa for

MIL-S-3S039 Systems, Ilhunfn@ed, Warntng, Caution, and

Advfsory, General Specffieatton for

MIL-&6855 Humao Engfneerfng Requirement-s for Military

Systems, Equipment ~d Facilitates

MIL-P-83335 Panels, Integrally Illuminated, white,

General Specification for

2.

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MIL-C-81774A

STANDARDS

Federal”
i
FED-STD-595 Colors

t Military

MIL-STD-143 Standards and Specifications, Order of Precedence

: for the Selection of

-1 MIL-STD-203 Aircrew Station Controls and DispIa@ for FL~ed

Wing Aircraft

kIfL-STD-250 Aircrew Station Controls and Displays for Rotary

‘WfngAircraft

MIL-STD-411 Aircrew Station Signals

MIL-STD-454 Standard General Requirements for Electronic

Equipment

MIL-STD-480 Configuration Control - Engtneerfng Changes,

Deviations and Waivers

MIL-STD-783 Legends for Use in Aircrew Stations and

on Airborne Equipment

MIL-STD-783 Nomenclature and Abbreviations to Aircrew Stations

MIL-STD-1333 Aircrew Station Geometry for Military Aircraft

MIL-STD-1472 Human Engineering Design Criteria for Military

Systeme, Equipment and Facilities

MS25212 Control Panel, Console Type, Aircrsft Equipment,

Bssic Dimensions

MS25213 Control Panel, Aircraft Equfpment, ~Tical

Installations

MS33742 Shafte. Control Knob

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MIL-C-81774A

PUBLICATIONS

Military

DH2-2 AFSC Design Handbook for Crew Stations aad

Passenger Accommodations

SD-24 General Speclficatione for Design and Construction .*

of Aircraft Weapon Systems ,

3. REQUIREND3N’IS
“r
3.1 D-- The design of the control panel shall be fn
accordance with MIL-STD- 1472, SD-24, DH2-2, data genemted under the re-
quirements of MIL-H-46855, and tbe system requirement of ti,e system
specification which dictates the operational environment and mission considera-
tions specified by the procuring agency. The control panel shall be designed to
assure effective operation, safety, and minimum operating error under all
operating c mditious of the airc&t. The control p-&el sl&l be designed for a
specific location as specified by the procuring agency. When more than one
location is specified, a design for each specified location shall be made; however,
differences in design shall be limited to changes required by reach, manipula-
tion and visibility. All markings, legends, and displays shall be visible and
legible to the operator under the range of ambient illumination conditions fn
the operational environment. The surtice (touch) temperature of all displays,
pushbuttons, knobs, etc. that the crew members operate shall conform to the
requirements of MIL-STD-454.

3. 1.1 Approval - The design (as represented by the data package

(3. 2)) shall be reviewed and approved hy the human factors and engineering
personnel of the procuring agency. Only the approved design shall be fabricated
for aircraft use.

3.2 R&a - The contractor shall prepare and submit to the

procuring agency a data package for each control panel design. The package
shall be submitted in time to permit review aad approval prior to the fabrication
of the control panel. The package shall consist of a Control Panel Iayout
(3. 2. 1), Human Factors Data (3.2.3) and Specification Endorsement Data
(3. 2. 4). Tfie emI product of a control panel design shall include a packsge of
data consisting of a recommended control/display equipment configuration and
location(s), and ratiomle for the recommended design includtng available experi-
mental data.

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Upon selection of a design approach, the data shall accordingly be revised and ‘.
submitted for inclusion in performance and procuremmt specifications. Pre-
liminary equipment iayout drawings and component Iis= sha~ be prxred and
submitted for review and concurrence. Static mockup and dynamic simulation
inay be required b se~ect an optimum design or to validsw the design of control/
b
display equipment. Engineering change propxmls that affect the control panel
shall include updated data in accordance wfth hfiL-STD-4S0.

.
3.2.1 Control panel layout - The control psnel layout data sbzll
be submitted in the format conforming to Appendix A snd Figure 1 and shaU
r include:

(a) A full-size layout of the panel including markings,

bole centers, and mounting plate references.

@) A hole schedule indicating the sizes and types of holes.

(c) A bardware schedule @ MS hardware is not used.
a dimensional specification control drawing must
be attached) and a remarks bleck (which covers
special characteristics such as color of indicators,
I shape of toggle handles, positions of mechanical
indicators).
I
(d) A signature and a title block (including the drawing
title, drawing number, tolerances, etc. ).

(e) Notes (to include engineering notes such as corner

radii, type of panel, and panel fabrication).

(f) A revision block to indicate any changes made to

the drawing.

w .%ction views to clarffy how hsrdware is mounted.

00 A full-size panel dieplay drawing to include all mark-

ings and bardware shown in a true view looking into
the face of the panel.

3.2.2 Film po sitive and film negatives - NO fuU-size negatives

and one full-size film positive of the control panel 9hall be provided. The
negatives and positive shall meet the requirements included in .4ppendix B. The

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MIL-C-81774A

backfng plate shall be referenced in the drawing. The film positive and film
negative shall include crOsses (+) for all hole centers, and all markings shau
be shown. The holes shall be coded. Dimension marks shall be added to
ensure accuracy of the positive and negatives within +0. 003 tnch for all markings
and hole centere. Crop markings defining panel edgee will also be included.
1.
3. 2.3 Human factor desi gn - The human factor design data shall *
include a human engineering date package as specified in tbe following sub-
paragraphs.

3.2. 3.1 Panel functional description - A fictional description of the

panel ehall be eubmitted (in the format defined in HED-1 of Appendix A) which
defines and gives the rationale for all controls and displays, for their arrange-
ment on the control panel, and for oentrol protective devices. Critical controls
must be identified and the precautions taken to reduce any error shall be ex-
plained. The panel functional deecriptfon also shall identify, by report number,
title, appropriate pages, and submittal date, tbe function allocation and task
analysis data submitted under MIL- H-46855 requirements which were used as
the basis for panel deeign.

3. 2.3.2 Panel location(s) - The location(s) of the panel in the crew

etation for which the panel is designed shall be reported in the format provided
● ’)
to HED-2 of Appendix A. The location(s) of the panel is established by the
dietauce from the Neutral Seat Reference Point (NSRP) b the panel center
measured on tbe horizontal, vertical, and lateral axes as shown in Figure 2 and
the angle of inclination of the panel to the horizontal, vertical, and lateral planes
through the panel center.

3. 2.3.3 Viewing - The viewfng dietance, tbe vertical look angle, and
the horizontal look angle to the center of the paneI shall be reported in the format
provided in HED-2 of Appendfx A. The distances and angles shall be based on
the description of the crew station geometry in accordance with the requirements
of ivfIL-STD-1333: The vertical look angle is tbe angle fn degreee from the
horizontal line of vie ion to the center of the panel with the apex at the design eye.
The horizontal look angle is the angle in degrees measured from the forward
vision line.

3. ~. 3-4 Legend description - A list of all legends appeartng on the

panel or used in panel displays shall be submitted in the format provided in
HED-3 of Appendix A. Abbreviations shall include acronyms, contractions, and
epell ing variation. For each abbreviation Iieted, the abbreviated word (or
words) till be spelled out, and the source of the abbreviation will be identified @..
accordance with MIL.-STD-783.
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MTL-C-817?4A

3.2.3.5 = - A description of the methods of coding USa (i. e..

shape, color, symbol), an explanation of the intended purpose of each ina~ce
of coding, and the rationale underlying the choice of coding metheds sbafl be
submitted. The format to be used is provided tn HED-4 of Appendix .\.

3.2.3.6 Crew station control panels arrangement - l%e contmcter

shall provide a composite arrangement drawing showing all of the control panels
in tbe crew station based on each control panel locatfon as requested in paragraph
3.2.3.2.

3.2.4 Specification endorsement data - To facilitate creative con-

trol panel design, the following paragraphs define the procedures a contractor
shall use in requesting approval of designs which are beyond the scope of, or
which are in conflict with, this specification.

3.2.4.1 Specification Endorsement Requ est (SER) - \\’hen as a result

of the use of (1) newly developed hardware or components or (2) a unique application
of off-the-shelf bardware or components, a control panel design is not defined
in this specification, the contractor shall submit a completed Specification En-
dorsement Request form to the procuring agency for approval te use the design.
(A sample SER form, EDD-1, is included in Appendfx A. )

3.2.4.2 Design Alternate Request (DAR) - When a design alternative

is deftoed heretn as requiring the approval of the prommhw ‘Wenw, Or when
design alternatives not specified are thought to improve operability, encompass
a design improvement, or reduce cost, the contractor shall submit a completed
Design Alternate Request form to the procuring agency for approval to use the
design. (A sample DAR form, ED~2, is included tn Appendix A. )

3.2.4.3 Specification Deviation Notification (SDN) - Deviations to

this specification that a contractor may wish to have approved sldl be brought
ta the attention of the procuring agency as seen se tbe contracted has made a
determination of noncompliance and in no case later then 30 days prior to sub-
mittal of the control panel drawtng for approval. The contractor sbalf submit
a completed Specification Deviation Notification form within the time perfd
specified herefn to the procuring agency to satiafy this specification require-
ment. (A sample SDN form, EDD-3, is included in APPSI@XA. )

3.2.4.4 Procuring agency approval - The contractor shall be informed

of the action of the procurfng agency within 30 days following the agency’s receipt
of the requeet.

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MIL-C-81774A

3.2.4.5 ~ ta - SER, DAR, and SDN forms shall

be sent via certified mail to establish the dats of receipt by the cognizant
human factors personnel of the procuring agency.

3.3 w~ - specifications and etandarde for all materials

and parts, and Government certtfica~on and approval of processes and equipment,
which are neceesary for the execution of this specification, ehall be selected in ,*
accordance with MIL-STD-143. Control panel material shall be in accordance
with MIL-c-6781, and the lighted panel materisl shall be in accordance with
MIL-P-7788.

3.3.1 ‘Anti-reflective coating - All glass transparent areas on the

control panel shall be treated in accordance with MfL-C-14806:

3.4 Mount@ - All contrcl~, displays, panels, and mounting

plates shall be mounted in accordance wtth MIL-I-87oO, MfGE-7080, MS25212
and MS25213.

3.4.1 Cmitrol and display mount% - The mounttng of controls

and displays shall take tntc account the Iocation of the control paneI fc the crew
etation eo that all dieplays are legible from the deeign eye pdrd as defined in
MIbsTD-1333.
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3.4. 1.1 Toggle switches - Toggle stitches shall be fnstalled eo
that the top of the bushing or the stitch mounting bracket is flush wtth the eurface
of the panel whenever possible.
I
3.4.1.2 Pushbuttons - Pushbutton swftches shall be installed eo that
the button can be fully depressed wfthout phyeical interference from the”panel.
If the pushbutton is mounted below the surface of the panel, a suitable cutout
to permit unhampered glove band operation shalf be provided. A minimum O.90
inch diameter cutout shall be provided for round pushbuttons. Pushbuttons may
be mounted above or below the panel surface to a maximum of 0.25 inch.

3.4. 1.3 ~~ - Knobe shall be inetalled 0:03 tnch + 0.01 tnch above
the surface of the panel. For lighted control kachs, the mfnimum clearance shall
be employed to mfnimize light leakage between the control knob and the panel.
A knob may be instiled through the panel cutout, provided that the distance
from the tap of the knob to the panel surface is a minimum of 0.50 inch. Metal
knobs or plastic knobs with metal inserts shall have self-locking devices fn
accordance with MfL-K-25049 and the ehav for the knob ehall conform to
MS33742. In no case shall a knob with a rood mounting hole be used with a
“D” Elhatl.

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3.4. 1.4 Thumbwheels - Tlmmbwheels shall be inetdled so that they
protrude from the surface of the panel not less than’ O.125 inch snd no greater than
O.50. The abeve panel distance shall be in direct relation te the diameter of
the tbumbwheel in Table II. The thumbwheel shafl be installed so thm it can
be operated with no physical interference from the panel.
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3.4. 1.5 Ffnger operated control levers - Levers that are finger
operated ehsll .be installed a maxim”um of 2.00 inches above the panel au rface.

3.4. 1.6 Legend lighte - Legend lights shall be instslled flush with the
“1 top surface of the panel whenever possible. To avoid possible obscuration by
displays, the legend light may be raised to the level of the adjacent d@aYs.

3.4.1.7 Electro-mechanical and electro-optical indicators - Electro-

mechanical and electro-optical indicators ehall be installed flush with the surface
of tbe panel whenever possible.

3.4.1.8 Digital dtsplays - The display ahsll be mounted x close to

tbe panel surface ae possible and shall be aligned. with any viewing windows in
the plastic panel such that one series of horizontal and/or verttcaf digita can be
read at’one time.

3.4.2 Guards - Switch guards, when not an integral part of the

control, shall be mounted securely to the panel backplate. The control shalf
not be operable witbout removal or opening of the guard, and upen opening tbe
guard shall not subsequently interfere with the operation of the protected device
or adjacent controls. ;

3.4.2.1 Frangible guards - Frangible guards shall be treated to

break cleasdy witbout sharp or jagged edges to prevent possible injury to personnel. ‘.<

3.5 ~ - The application of colors ehall be emooth and uniform.

Painted and silkscreened areas ehall not bleed onto surrounding areas. Undesir-
able reflection shall be kept to a minimum on panel surfaces, controls, displays,
I and guarde.
?
3.5.1 Opaque colors (reflected) - The opaque colors designsted
throughout thie document shall be thoee spectfied below io accordance with
FED-STD-595:

Black 37038
Light Grey 36440
Dark Gray 36231
White 37875
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MIL-C-81774A

Red 21105
Orange-Yellow’ 33538
Green 14187

3. 5.2 Color of lights - The color of the panel lighting shall be

tn accordance with MIL-C-25050.
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3.5.3 Lighted pan el - The lighted panel shall be finished in ac-
cordance with MILP-7788. It shell be black in compartments whereto the
occupants have external visual duties and may be gray or black in other com- -i
partments. Panels to be used in uSAF aircraft shall conform to MIL-P-83335
and shall .be black in all compartments.
I

3.5.4 Mounting plate - The front face and edges of tbe mounting
plate eball be the same color as the ltghted panel end shall be fintshed tn accord-
ance with MIL-C-6781.

3.5.5 Faeteners - The color of panel fasteners and mounting-plate

,-
fasteners shall be the same as the panel.
e
3.5.6 Qi@!!!i - me opa~e color ffnishof all cOntrols sbsll be
dark gray on black panels and black on gray panels except as specified tn the
following sub-paragraphs.

3.5.6.1 Tranefllumfnated controls - The coIor of the transtlluminated

portion shall be as determined by the required color of the emitted light. All other
vtsible portions shall be dark gray on black panels and black on gray panels.

3. 5.6.2 Transillumtnated pushbuttons - Pushbuttons with trans -

iIluminated marktngs on the facee shall have an opaque background tn the flight
compartment and may be dark gmy, black, or traneluecent background in other
compartments.

3.5.6.3 Non-traneillumtnated pushbutbme - The non-transilluminated

pushbutton cap sbsll be dark gray on a black panel and black on a gray panel unless
otherwise specified by the procuring agency.

3. 5.6.4 Toggle swttehes - AH toggle stitches shall have a non-glaring

natural metallic finish as specified fn MIL-S-3950 except tbe color of the wedge-
i
shaped bat handles of slew-etitch toggle switches shall be dark gray.

3.5.6.5 Oxygen ewitch (or lever) - This control abafl be green with ,,
a whjte tip. o.)

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3.5. ‘7 Panel markings - Panel m&ings shaU be whtte except

when illuminated or when they denote emergeacy-action mnrrols and they shaU
he in accordance with MIL-M-18012.

3.5.8 Guards - Guards sIMII be !he ssme color as the panel on

which they are mounte,d except for emergency-type guards which shall he red.
Guards shall be finished in accordance with JLL-G7703.
,’

3.6 Lighti~ - Lighting proviiona sbaU permit tbe use. of the

panel controls and provide for readability of Mtegm.1 displays under ~ght and
day conditions.

3.6.1 Lighted pan el - The ligtned panel shaU be lighted in accord-

ance with MIL-P-7788 or ~GP-83335 for L3AF panels. PrOVkdOIM for adjusting
the panel lighting at installation to match that af adjacent fxmels shall be incor-
porated.

3.6.2 Controls - Controls shall be lighted sufficiently to permit

the operator to locate the control, determine its pm ition, and operate it without
delay. Unlese otherwise specified the following cmtrol lighting requirements
shall apply.

3.6.2.1 Pushbuttons - When feasible tbe surface of the legend-

illuminated pushbutton shall have a stroke-width border Iocated at a maximum
distance of 1/8 inch from the edge of the pushbutton surface. The brightnesses
and/or contrast of pushbuttons ehall meet the requi remente for displays as
specified herein.

3.6.2.2 Knobs - Markings such as hbbsr lines and numerals on knobs

must have a brightness of not less than 90% of tbe average marking brightness of
source plate as defined by MIL- P- 7788. Where the knob skirt covers illuminated
areas in tbe plastic plate, tbe knob skirt shall extend a minimum of 0.03 inch
beyond tbe perfphery of the lighted area. Ay markings @ be illuminated on the
knob skirt must be approved by the procuring sgency.

3.6.2.3 Thumbwheels - Thumbwheels shall be iUusninated, sufficiently

to identify the location snd configuration of the control. When the thumbwheel
dieplays information, the readouts shall meet the requirements for displays.

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MIL-C-81774A
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3.6.3 Displays - Display lighting shall assure information presen-

tation under all ambient illumination conditions. DispIay visibility and legibility
under high ambient ill urainatioh conditions (10, 000 Ft. Candles) shall be provided.
Contrast between the lighted and unlighted portion of each display, under high
ambient illumma“ tion conditions, shall be a minimum of 3 when calculated as
follows:
~
B2 - B1
c=—
B1

where: B1 is the brightness of theunligbted portfon.

B2 is the brightness of the illuminated pertion.

Cis contrast

3.6.3.1 Mechanical indicators anddigitaf displays - Theee indicator

and displays shall be wired to the variable-brightness control which controls the
Iighted panel
except under
the contrast
andthey sballmeet the brightiesses requirements for lighted panels
high ambient conditions and under these conditions they shall meet
requirements specified inparagraph 3.6.3.
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3.6.3.2 Aircrew station signal s - Wad, caution and advisory
I signal lights shall meet the requirements of MIGSTD-411.

3.6.4 Flashing lights - Flashtngor intermittent light is distracting

inan aircrew station and shall not be used unlees appreved by the procuring
activity.

3.7 Markings - All markfngs shall be legible under all the

ambient-illumination conditions specified in the followfng sub-paragraphs.
Markings shall be uniform in stroke width with eharply defined edges. Markings
shall be uniformly clear and without distortion. Marfdn& shall be concise and
shall be held to a minimum for ease of interpretation and prevention of excessive
illumination. All panel futictione, subfunctions, controls, and displays shall
he so labeled to insure proper display interpretation and control selectton by the
operator. lhmctiona.f legends shall be used for controls and displays, and control
legends shall fndicate the results of control movement. When controls and
displays are to be used together, the legend shall indicate the functional relation-
ship. Legends shall be selected or derived in accordance with MIL-STD- 783.

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Operational or military-service-oriented legends shall be used instead of engi-

neering terminology.

3.7.1 Style end size - The lettering and numbering style and eize
shall be in accordance with MIL-M-18012 except that the height of the markings
shall be O.140 ~ .005 inch.
v
3.7.2 Punctuation and .symbde - Abstract symbols (i. e., squares,
Greek letters) EIIZIInot be used unless prior approval has been obtained from
the procurhg agency. Periods shall be omitted; letter spacing may be used to
preclude misinterpretation.
1
3.1’.3 Unrelated markings - Trademarks, gpmnd maintenance
markings, and other markings not related to in-flight panel operation eball not
I be displayed on the panel face,

3.7.4 Lighted panels - Markings shall not extend inte the paneI
edge radius.

_ - When lines are required to clarify a panel display

m
3.1.4.1
(i. e., to segregate systems, reIated control functions, and indicators), they shall
II be 0.020 + O.003 inch wide. The use of such lines sfmfl be held to a minimum.
Where the line appears above the functional group, the title shell be in a break
in the line. Indicator lines for detented knobs shall be 0.020 inch wide. Under-
HI@ is not permissible.

3.’7.4.2 Location - The distance between markings and the related

subject, function or component SW be as ehown m Figure 3.

3.8 Controls - Controls used on the control panel must be deter-

mined primarily by the requirements of the tack to be performed snd the capa-
bilities and limitations of the operator. Ae a minimum in tbe selection and applica-
tion of control components, the followtng factors must be taken inte account.

3.8.1 Operabili ty - The speed, accuracy, and ease of operation

of the controls in the operational environment shall be considered.

3.8.2 Protection from accidental activation - All controh shall

provide inherent protection from accidental activation due to vibration, loads,
and light contzict.

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3. 8.3 Maintainability and relfabili~ - me controls shell permit

routine cleaning and servicfig and shall be compatible with applicable maintain-
ability and reliabilim requirements. Requirement 35, 36 and 54 of MIL-STD-
454 apply.

3.8.4 Consistency - Consideration shall be given to achieving

operational consistency, and consistent training, through the use of similar -3
components for related applications.

3.8.5 Conservation of panel space - Controls shall be selected to use -

a minfmum of panel surface space without compromisb!g operability end reltebflity.

3.8.6 control selection - Controls shall be selected to tmplement

the functions identified by human factors engineering analysis derived tn accord-
ance with MIL- H-46855 and MfL-STD- 1472 where not covered herein. The
selection of control type and control characteristics shall be based on operational
considerations, circuit requirements, and the best use of space available.

3. 8.6.1 &sic selection criteria - The basic criteria for the selection
of a control type shall be in accordance with Table I. For tictions not listed,
the basis of selection must be documented and submitted to the procurfng agency.
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3.8.6.2 Lever-lock toggle stitches - Lever-lock toggle switches
may be used where a toggle switch !s indicated fn ‘IkbIe I if there is a need for
additional protection from @advertant actuation.

3.8.6.3 Miniature toggles - Minteture toggles may be selected for

use to conserve panel space or for coding purposes with the ~proval of the
procuring agency.

3.8.6.4 Solenoid-held toggles - Solenoid-held toggles may be used

in special applications upon approval of the procuring agency.

3. 8.6.5 Combined legend light/pushbutton - Signal legend lighte may be

integrated with pushbuttons where appropriate. The legend light shall conform te
all requirement for displays, and the pushbutton characteristics shall be as
spectfied herein. Illuminated pushhuttone will not be used in compartments
where crew membere have external visual tasks unless approved by the procuring
agency.

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MIL-C-81774A

Concentric knobs - Non-legend concentric knobs may be used te ,,.

3.8.6.6
cooaerve epace when such use 1S functionally applicable upon approval by the !
procuring agency,
?
3.8. ‘7 Toggle switch characteristics - Toggle stitches are con- !
sidered herein to be discrete-position controls and shall be in accordance with
MIL-s-3950. The switch shall not be capable of being stopped between positions. :.
Toggle switch characteristics sMl be in accordance-with Table II.

3. 8.7.1 Ceding - The followtng coding tecfudquee shall be used for

t
toggle swftches:

(a) Toggle ewftches for slewfng functions shall have a

wedge-shaped bat handle with flat, ribbed gripping
surfaces.
i
b) Lever-lock toggle switches shall have a distinctive ;
shape which provides gripptng surfaces on the bat
handle suitable te disengage the lock.

(c) Toggle switches may be touch-coded”to increase dis-

crimination between adjacent, closely spaced switches.
l%is code must be approved by the procuring agency. ::

(d) Solenoid-held toggle switches shalf be coded to provide

a cue te the holdfng function. The handle for this type of
switch shall be rectangular in crose section wfth the
wide dimension perpendicular to throw. Dim ens ione
are in Table II.

(e) Other methods of coding, such as special shapes, re-

sistance, and diameter, may be used only if specified
or approved by the precuring agency.
!
3. 8.7.2 Momentary toggle switches (spring Ioaded/ - Toggle switches
should be considered for momentary-contact control functions when a momentarv
pushbutton is not feaeible or when C_forward-reverse slewing function is requir&

3.8.7.3 Solenoid-held toggles - Solenoid-held toggles shall meet

the requirements of MIL-S-5594.

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MIL-C-81774A

3.8.7.4 Lever-lock switches - Lever-lock switches may be used in

fieu of toggle switches when additiod protection against inadvertent actuation iEI
required. Maximum force to overcome a locked Wsition ehall be 48 ounces.

3.8.8 pushbutton characteristics - pushbutton characteristics

shall be in accordance with the requirements of MIL-S-22885 and Table II.

3.8.8.1 Actuation - pushbuttons shall have either a momentary

actuation (push-ON, release- OFF) or a reset actuation (push-ON, push-OFF).
A positive indication of control activation shall he provided (e. g., snap feel,
integral light, visible dispfecement, @emal light (simple indicator)).

3.8.8.2 Shape coding - Where poeeible, pushbuttons sbdl be coded

to indicate the type of switching function. A round pushbutton shall be used for
momentary contact fpress to actuate, release to deactuate). A rectaagtdar or
square pushbutton shall be used for a matnfained-position pushbutton (push to
actuate, push to deactuate).. A truncated py~~d ti~ a circ~r depression
shall be used for data entry functions in keyboard arrangements.

3.8.8.3 Keyboard pus hbutton characteristics and visual verifica-

~ - mess otherwise SPCci50& keyboard pushbutton cha=ctefistice
visual verification sbslf conform to the folIowing requirement.9:
and
●❉❉
(a) Size -0. 5-inch square trips
— O. 5-inch-diameter round tops

m) E&wamttion - The cenbr-to-cent.er distance of adjacent

keybomd pushbuttons shall be a mtnbnum of 0.625
tnch.

(c) ~ - The actuation force shall he 25 ouncee * 5 ounces.

(d) ~1 - The limit load strength shall be 20 pounds in

the diration of actuation.

(e) Lighting - Keylmard pushbuttons shall be illuminated te

meet the brightness requirements of MIL-P-T786.
.!
I
(f) _ - Keyboard pushbuttons used for keybeard entry
tasks shall have a depression on the contrel surface
described by a sphere wltb a 1.00+ O.5-inch radius.

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MIL-C-8177@

The numbers and letters being keyed into a keyboard shall be displayed for
verification before entry. For example, see Figure 4.

3.& 9 Disc rete rotarv control knobe - Type C bar-type koobe (see
Fi~re 5) .gball IM used with rohry select switches. Knobe shafl cOmPIY with the
i
rcquiremente of MIL- K-25049 and as specified herein.
.
3.8.9.1 Knob ShZflS - Knobs shall be bar shaped with vertically
oamllel eides. ” The Index end shall be tapered to mintmize Darallsxic error.
“fie switch bar shall be short tailed to prevent reading the w“rong end of the
pointer.
-#
3.8.9.2 Knob size - Acceptable knob sizes are listed in Table If.
The selection of knob size shall be based on efficient use of panel space, force
required, and number of settings. KIIObeof different sizes may be used to
increase vieual and tactual discrimination between adjacent controls.

3. 8.9.3 Number of positions - Rotary selector switches shall have

no more than 12 positfone for tactual positioning and no more than 24 positions
1’ for visual positioning. If lese than 360 degrees of rotation are used, poeitive
stope ehall be provided at the begiming and end of the range of control positions.
* Where functional requirements dictate the eltminatlon of stops, the deeign shall
i,‘1 be referred to the procuring agency for approval. Knobe aesoctated with digital
displays shall have 10 equally spaced positione and no stops.

3.8.9.4 Displacement - Angular displacement between posittone shell

be in accordance with Table IIf, except for controls associated with digital dis-
plays. Knobs associated with digital displays shall have a displacement of 36
degrees.

3.8.9.5 starting POsition - The starting position of a rotary selector

switch shall make it poeeible for most changes in position to be m“tie with a
qfngle wrist movement and wfthout extreme wriet rotation. The requfrementa
for knobs designed to be used by the right hand, left band, or either hand ehall
be in accomiance with Table ITI, except where functional indication of starting
position requires poeition modification.

3.8.9.6 Gmeping surface - The grasping surface of the ‘knob ahafl

be so designed as to prevent the 5gere from elipp~g off the control. The knob
shall have serratione running peqwmdicular to the panel surface on the sides of

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LifL-C-81774A

the knob to provide a gmeping su.face for tumfng. A pull-to-turn knob shall
be knurled.

3.8.10 Thumhwheel selectors. discrete - Thumbwheel controle

-Y be wed when the function req~ree a compact digital fnput device. The
dbnensione for these controle are epecifled to Table IL

3.8.10.1 Number of positions - Discrete rotary thurnbwbeel selectors

shall have no mom than 10 positions (O-9).

3.8. 10; 2 Thuxnbwheel ehape - The digtta or legends on the drum part
of the thnyibwheel shall be in ltne with the raised control tip of the thnmbwheel
so that the control tip center line ie perpendicular to the panel sufice when any
digtt or legend is betng read. Thumbwheels shall not be capable of betng
stopped between digits or legends.

3.8.11 Continuous rotary control knobs - Conthmoue rotary knobs

shall be eelected for control functions requiring manual adjustment over a range
of values. Knobe shall be deeigned to the requirements of MIL-K-25049 and ae
specified herein.

3.8.11.1 Shspe - For adjustments where more then one full turn is m)
required, a round knob shell be need. For adjustment of less than one full turn,
and where the radial position of the knob is not a source of information, other
shapes may be used to increase discrimination. Controls having more than 360
degreee of rotation (Type A) shall be distinguishable from thoee having lese than
360 degrees of rotation (Type B). See Figure 5.

3. 8.11.2 Knob skirte - A knob ekirt with a potnter or a slotted sktrt

OISy he used to indicate the rridial position of the knob. The pointer or slot shall
be visible from the design eye position defined in MIL-STD-1333 for any pointer
1
pmition. All knobs or knob skirte with imlices ehall be illuminated in accord-
ante with the requtremente of MIL- P-7788.

3.8. 11.3 Concentric knobe - Concentrically stacked knobs may be

used for related fnnctione. The rotation of one knob shall not affect tbe settfng
of the other.

3. 8.11.4 Knobe incorporate ng a switch position - If the continuous

control incorporates a discrete function, the radtal position of the knob shall be

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ivllL-b-OK[-l’in

9 marked and indexed with the panel Iabcd in the detent position. The force to
overcome the detent position shall not exceed 12 inch-ounces but shall be at
least twice the continuous reeistzmce. The starting position or OFF pckition
shatl be at the extreme counter-clockwise poeition.

3.8.12 Continuous rotary thumbwheels - Thumbwheels may be

selected for continuously varfable control functions to coneeme panel epace.

3.8.12.1 = - ThumbwheeIs ehafl be round with sermted edges.

3>8. 12.2 Dimension - Thumbwheel dtmeneione are given fn Table II.

1
3.8.13 -s- .

3.8. 13.1 Levere for finger opemtion - Levers for finger opexation
shall meet tbe following requi remente.

3.8.13.1.1 Limb SUpport - When levere for finger movement are used
to make fine or continuous adjnstmenta, arm euppert efmll be provided.

3.8.13.1.2 ~ - If a epherical handle is provtded, the diameter shell

,9 be greater then 0.5 inch end shall not =ceed 0.75 inch. K a cylindrical handle
is used (cylinder encircled by thumb and fingers), the cylinder shall be 0.375 inch
mtnimurn and O. 50 fnch maxfmum.

3.8.13.1.3 Resistance - Nnger opemtton resistance shall be 32 ounces

minimum and 60 ounces maximum.

3.8.13.2 fiand controllers - Levers deeigned for hand control shall

be ~ accordance with IwfL-H-8810 and shall meet the folfowfng requirements.

3.8.13.2.1 Limb eupport - When hand control levere are used to make
fine adjuetmente involvfng emsll hand movements, arm support shall be pro-
vided.

3.8.13.2.2 ~ - The hand-grip of a controller may be either round or

oval in crose-section. The diameter or major axte shall he 0.75 incbmfnimum
and 1.50 inches maximum. The length of the lever should be at least 3.75 inches.

3.8. 13.2,3 Resistance - Minimum resistance for a hand-controlled lever

is two pounds. Maximum allowable resistance depende upen actuation sensitivity
pjacenlent and direction of control movement. Fore-aft movement: 10 inchee

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MIL-C-81774A

●1
forward of Neutral Seat Reference Point (NSRP) -30 pounds; 16-24 inches
forward of NSRP -50 pounds. I.ateral movement: IO-19 inchee forward of
... NSRP -20 p0UUd8.

3.9 Dieplays - Selection and application of displays for the

control panel ehall be baeed on the dieplay requirements enalyaie and the
performance requirements of MIL-H-46855 and ehall be in accordance with
the criterta of MIL-STD-14’72. In the eelection and application of display -1.
components, consideration shall be given to the wie@ capabiltttee ad limits-
tions of the operator and to the operational environment in wbtch the dieplaye
will be used.

3.9.1 Information - Tbe limits, epecifici~ and, accuracy, form,

I redundant y, and combining of information ehall be as followe:

(a) The information dieplayed to an operator eball be

limited to that information neceeeary for tie operator
to perform the epeciftc actions or make tbe requtred
decieions.

(M The information shall be &splayed only to the level of

specificity and accuracy required for 8pecific opemtor
action or decision.

(c) Tbe information shall be presented to the operator to a

directly ueable form. Requirements for decoding,
transposing, computfng, and interpolating eball be
minimal.

(d) Redundancy in the display of information t.a a single

ope rater shall be avoided unless redundancy ie required
to achieve epecified reliability.

(e) Information necessary for performing different activities,

such ae operation and tmubleshootfng, eball not be
comb~ed in a eingle display mdeee tbe activities are I
comparable functions and require the came information.

3.9,2 Dieplay selection requirements - The baeic “mquiremente for

the selection of dieplsy type are given in Table lV. Additional requirements
modifying the bae ic dieplay-~ eelection are given in the following eub-
psragraphe..
I
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MIL-G-ti1774A

““~ I
3.9.2.1 Legend lights - Legend lights shall be selected to communicate
system fuoction/malfunction equipment condition, or opemting mode in accordance
with MIL-STD-411 and, where appropriate, MIL-S-38039.

3. 9,2.1.1 Combined legend light/pushbutton - Signal legend lights may

be integrated with pushbuttons where applicable. The legend light shsU confo~
to all requiremen~ concerning such displays, and the pushbutton characteristics
shall be as specified herein.

3. 9.2.1.2 Warning and caution legend lights - Warnfng and caution

lights shall not be used on a control panel without the approval of the p%curing
agency.

3.9.2.1.3 Adviso~ legend lights - An advisory light is an illuminated

signaf assembly which indicates safe or normal contlguraticn, condition of
performance, or operation of essential eq~pment, or wMch attracts attention
tmd imparts information for routine action purposes. The use of advisory lights
shall be minhpized. They ehall not be used where other methods, such as switch
labeling, mechanical visual signals, etc. , maybe employed. Advisory legend
lights require approval by the procuring agency.

3.9.2.2 Segm ented-character displays - These displays may be used

to preeent alphs-mnne ric inforrnatton. These displays can provide a full set of
letters and numbers for readout by illurnimthg different combinations of line
segments. Segmented-character dispfays should be designed so that failwe of
the display (any segment) will be immediately apparent to the operator without his
having to initiate a lamp teet. Segmented-character diepIays shall be legible
under all ambient illumination conditions. Character style, size, and epacbig
shall net degrade’ readability. The segmented displays shall dim uniformly and
individual segments shall not dim out before others. The intensity distribution
along the segments shall not vary noticeably. Approval by the procuring agency
must be obtained prior to use.

3.9.2.3 Counters - Countere may be used to present quantitative data

when a quick, precise indication is required.

2. 9.2.4 Printers - Prtnters shall be used to present large quantities

of numerical and written data. Data such as checklists, aircraft performance
characteristics, electronic troubleshooting information, end detailed mission
information are the primary types of information to be displayed on a printer.

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MIL-C-81774A . .

3: 9.3 Discrete-signal indicator display cbamcterietlcs -

3.9.3.1 Multiple-legend arrays -

3.9..3.1.1 Stacked-legend-plate indicators - Multiple-1egend tndicaters

(legend plates stacked one behtnd another) shall be designed to conform with the
fOllowill&y

(1) ~en a rear legend is illuminated, it shall not be

obscured by the front legends.

(2) Rear legend plates shall be so placed ae to minimize

parallax.

(3) Rear legends shall be eqael in apparent brightness to

front legends, and the contrast between rear legends
and background shall be equal to that between the front
legend and its background.

3.9.3.1.2 Multiple-legend reir-projection indicators - These indicators s

meet the brightness requirement of MIL-STD-411. g)

3.9.3.1.3 Visibfliw - Visibility of legend lights ehall not be restricted

by the periphery of the enclosure for the display. The vtewing Iimtte shall be
defined as any point wtthtn the frustum of an tmagtnary cone, whose sides make
an angle of 60 degrees with a perpendicular to the center of the display, and whose
fmstum has the same area as the aperture of tbe dieplay enclosure.

3.9.3.2 Electro-mecbantcal signal indicators ~flip-flop~ - Electro-

mechanical discrete-signal tndicat.ors may be used.

3.9.3.2.1 Legibility - Electro-mecbantcal indicator legends shall be

legible under all ambient lI@ting conditions. The tndicator shall be integrally
lighted and the brightness sbil.1 match the brightness of the adjacent displays.

3.9. 3.2.2 Legends - Msrkfngs and legends ehall be as specified in 3.7.

3.9.4 Vartable-signal displays -

3.9.4.1 Scales and gages - Other than self-contained scales and

gages shall not be used on control panel. without approval of the procuring agency.

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MILC-81774A

3.9.4.2 Count8rs/Se gmented-chsrscter displays - The cbsrsctsristtcs

of these displays shall he In accmxlance Mb MIL-M-1 EI012except as epecifisd
herein.

3.9.4.2.1 Letter wtdti - The wtdtb of the letters shall be 3/5 of the
height, except for the “P’, which shall be one stroke in width, and the “M” and I
“w’, which shall be 4/5 of the height. I

1“ 3.9.4.2.2 &roke WU - The stroke width of chsrsctere shall be 1/7 to

1/8 of the height.

3.9.4.2.3 Multtdrum counters - If counters have several drums ti”

display parwueter vsluee that change raptdly, the minimum value shall be a
fixed zero to eltminate distractions caused by oscillations or by rapid movement
of the drum. Dsctmal vaIuee shall be clearIy indicated.

3.9.4.2.4 Rate of c bange - At no station 00 the drum shall numbers

follow each other faeter than two per second when the observer is expected to
read the numbers consecutively.

3.10 Guard cbsractertstice - Swttch guards shall meet the re

quirements in the followtng sub-paragraphs and the rsqutrements of MIL-G-7703
where applicable. I&&ltng on the panel adjacent to a guarded switch shall not be
obscured by the guard or tbe switch. Controle shall be designed, oriented, and
located eo that they are not susceptible to being moved inadvertently. Particular
attention shall be given to crtticsl controls to prevent inadvertent actuation.
Lookwtre or safely wtre shall not be used.
L 3.10.1 Pr&ecttng toggle switchek - Critical toggle S@tches shall
be guarded by shields, covers, or recesses.

3.10.1.1 Channel” guard - A channel-type guard provides a barrier

on each side of the toggle but allows for mpid actuation of the switch. The
ctuumals ehsll be 1.25 inches apart on centers. The channel shall be only se long
and high as neetkd to protect the speci5c toggle switch.

3.10.1.2 Cover gua rd - A cever guard eball be used when rapid

actuation is not necessary. A cover SUSIXLwhen ~SS& seines as a flag to
denote an abnomnal condition.

3.10.1.3 Lever locks - Lever-lock-type toggle switches cau provide

barriers to prevent tnadvertant actuation tnto or out of varioti pesittons.

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MIL-C-81774A
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3.10.2 Protecting p~hbuttons - Pushbuttons ueed to control critical
~c~om ekll be guarded. Minimum clearance between the guard end pushbutton
shall be O.25 inch.

3.10.2.1 Receeses - Pushbuttons shall not be receesed more than

0,25 inch.

3.10.2.2 Cover guards - A circular collar-type guard maybe attached

to the backing plate in order to prevent unintended pushbutton actuation by
operators. The circular collar may be provided with a cover spring-laded to
the cloeed poeition or with a permanently attached frangible cover which, when
broken, will indicate intent to use. The cover guard regcrdlees of type shall not
obecure the function or statue of a pushbutton control or ite surfiundlng Iabelfng.

3.10.2.3 Frangible cover - A frengible-fype cover may be used to

chow that the ewitch has been operated.

3.10.2.4 Interlocks - Mechanically or electrically interlocked push-

buttons eball be used when it is neceseary to preclude the actuation of multiple
eelectione.

3. 10.3 protecting rotary controls - Rotary switches of a critical

nature shall be protected from inadvertent operation.

3.10.3.1 Locking devices - Rotary switches with critical functions

shall be protected against inadvertent actuation by a locking device which re-
quires the operator to pueh “in or pull out the knob before rotation.

3.10.3.2 Stops - Mechanical stops shall be provided on rotary switches

to prevent actuation into an mmeed poeition.

3.10.3.3 ~ - An external gate-type guard location adjacent to the

control knob can prevent actuation of the knob until the gate has been removed.

3.11 Panel layout and arrang ement - A panel shall contain related
controls and displays for a tlmctional eubeyetem or integrated controle and die-
plays for multiple functional subsystems. Panele shall be designed with full con-
sideration of the operator, the environment in which the panel is to be ueed, end
the functione it ie to perform.

3. 11.1 Control-display relationship - The relationship of the control

to its :1ssocbited display shall be immediately apparent to the operator. Such
relatiol~hips are made apparent through such deeign technique ‘as proxfmtty,
grouptng, coding, end marking.
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mL-c-81774A
,9
3.11.2 Operator efficiency - The arrangement of controle and
1“
displaye on a panel sm be designed to permit the operator to perform efficiently
I the taeke for which the pmel ie deeigned. The “stmplest arrangement compatible
with functional requlremente eball be selected. The design of the panel shall he
1“ tiaeed on an analyeie of the dynamics of operation and tbe performance require-
menb3.
l,. -

3,11.3 Critical primary and emergenoy controls - Critical primary

and emergency controls eball be capable of being operated under FIJIexpect-d
operating conditions, fncludtng poeitive and negattve G forces.
.“
3,11.4 Clothtng conetderations - Controle ehaU be Iafd out so that
control activation and movement are possible wttb gloves, pressure suits, or

I other clothfng which may be worn by the operator. Minimum control .ciearances
are specified in the followfng paragraphs; however, care shell also be t&en to
prevent imdvertent actuation or compromise of operation through adequate con-
trol epacing.

3.11.5 Direction of movement - When the devtce controlled is

visible, the control shall move in the direction of the controlled device. Howeveri
when the controlled device te not visible, there is an option to move the control
so as to be illustrative of either functton or movement according to convention
(MIL-STD-203, MIL-STD-250).

3.11.6 panel layout conventions - Tbe width of the panel (see

MIL-C-6781) is that dimension which ie perpendicular to the mounting rails and
the length of the panel ie the dimension parallel to the mounting rails. AU
directional references for control movement ehall be baeed upon the relstionshtp
of the operator to the installed control panel. For panels mounted in a vertical
or near vertical plane, wttfdn 30°, up is the direction from foot to head; down
ie the direction from head to foot. Right is the direction from the operator’s
midline toward his rtght band. L& fa the direction from the operator’s midline
toward his left band. For panels mounted fn a horizontal or near horizontal
plane, the forward or 12 o’clock direction is the direction the operator facee in
his standard seated poeition (Figure 2). Aft ie. in the opposite (6 o’clock)
positfon. Rfght aod left directions are the same as in the vertical panels (see
above ).

3. 11.7 Panel layout - Prtor to product release, a full-scale panel

layout drawing, as specified in-3.2.1 and the data specified herein shall he sub-
mitted for approval
.- of the procuring activity.

. .

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MfL-C-81774-4

3. 11.8 Functional grouping arrang emente - When more than two

control or display functions are requtred, the controls shall be ground bv
function such that the functions may be r&dily identified and dis-&&h& from
one another, selected as quickly as possible witilout error, and manipulated
accurately. The functional gmupe shall include the related eubfuncthma.
Sefxm-ation shall be provtded between functional groups so that they may be “.
readily dietinguiehed and identified. Line markings to separate fictional
groups may be used only with the approval of the procuring agency. The
functional groups shall be arranged on the panel according to the crttlcality of the
fenctfon and frequency of use. If there is a sequential relationship among functions,
the arrangement of the functional groups eball be by sequence. Controls and teet
pofnte not required during a fflgbt mieeion shall not be vieible from the tice of
the control panel. Test pointe and controls required for general maintenance
shall be eeparatd from the intlight cent mle and made avatlable on the control
panel but not on the front of the panel.

3.11.9 Pushbutton arrays and matrices - h array of pusbbuttone

serving ae an integrated control ehafl be such that, in a lateral array, left-to-
right progression is fn tbe order of increaetng priority or eequence. In a
longitudinal array, the forward pmgresaion is in order of increasing priority @
or sequence.

3. 11.9.1 Ten-digit keyboard - Ten-digit keyboarde shall use the

keybeard arrangement as shown in Figure 4. When required, minus, degree,
single-number insertion, decimal point, clear, and enter controls shall be added
to the basic keyboard ae shown tn Figure 4.

3.11.10 Control sepamtion - Controls shall be separated by enough

space to permit manipulation of contmle without interfererfce or delay. Con-
trols shall be positioned so that tie operation of one control eball not cause the
operatfon of any other control. Where reparation does not eliminate inadvertent
actuation, guards eball be used. Minimum control separation requirements are
given in Table V.

3.11.11 Display separation - Displays shall have s@icient separation

from other displays to eliminate confusion. Displaye ehall be separated from con-
trols sufficiently to prevent obscuring of the display when viewed from the
operatfng poeition.

3.11.12 Control actuation - Control actuation for crmtrole installed in

fixed -wing aircraft ehall comply with MIL-STD-203; for controls installed in

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MI~C-81774A ,
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rotary-wing aircraft, MfI.=STD-250 shall apply. For controls not treated in the
above, the fokwing shall apply.

3.11.12.1 Diec&te rotary selectors (lmobe/ - The extreme counter-

I clockwise position shall be OFF or the lowest value of the function fn terms of
numerical sequence. Tbe successive clockwise positions shall be armnged in
:,
1“ terms of increasing tbe value of the function or the numerical sequence.
j.
3.11.12.2 Dfecrete thumbwheels - Tlmmbwheel switches shall be
I “. rotated forward, UP, or rtght from the OFF position to iqcrcase value of the
function or the numerical sequence.
i

I ‘
1 3.11.12.3 Continuous rotary controls - OFF position, if required,
shall be at the extreme counterclochvtse position. Clockwise rotation shall re-
edt in increasing value of the functiow, i. e., increasing brightness level,
increase numetical value. For functions requirfng a null adjustment the null
index shall be digoed at fhe 12 o’clock position. Clockwtse rotation shaH result
in increasing the value and counter-clcmkwiee rotation shall result in decreasing
the value. The increase value may be presented as a plus condition and decrease
value ae a minus condition relative to tbe null or zero positien.

3.11.12.4 Continuous tbumbwbeele -“ Forwaxd, up, or right morement

shall result tn increasing value of the function. Aft, down, or left movement shall
result in decreasing value of the function. For functions requiring a null adjust-
ment, the null setttng or zero position shall be centered in the movement range
whenever possible. The index for the mdl position shall be centered perpendicular
to the tbmnbwheel axis. Increasing the value may be represented by a plus
presentation and decreaatng the value may be represented by a minus presenta-
tion. Limit stops may be used when appropriate.

3.11.12.5 Two-position toggle switchee - Actuation of two-pesition toggle

ewttcbee ehall be forward or upward for ON, normal operation, UP, or forward
as applied tn the aircraft’e longitudinal axis. Actuation of two-position teggle
stitches shall be aft or downward for OFF, emergency, override, or retmct.
Inboard/outlmard movements shall be used only for selection of equipment of
functions hnving a left or right poeition relationship to the longitudinal axis of
the aircraft. The control actuation stall be related to the opmator’s left-haod/
rfght-hand orientation.

3.11.12.6 l%ree-poeition toggle switches - The forward position ehall

represent the normal flight peeition, increase of the function, or tncrease when
related to a slew function. The center position shall be used for OFF, neutral,

27

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_.. ..— — .—
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MIL-C-81774A
●)
or an int&medfate function. The aft position shall be used for decrease value
of the function or override function.

3.11.12.7 pushbutton actuation - pushbutton actuation shall be consistent

with the functional requirement for momentary contact or hold contact. For
momentary pushbutton functions, actuation shall be depress: ON; release: OFF.
Holding or reset function actuation shell be depress: ON; release: no change;
depress: OFF; release; no change. Momentary pushbuttons shall be discrimtnable
from holding pushbuttons.

3.11.12.7.1 Positive indication - Positive indications of control actuation

(momentary and continuous), shall he provided, e. g., snap feel, integral lighting,
visible displacement or eimple indicator.

3.11.12.7.2 Multlsfation pushbuttons - A multistation pushbutton in-

corporates *O or more pushbuttons tn a single frame. Either lockfng or inter-
leeldng features or both eball be incorporated in multistation pushbuttons to
assure error-free operation. Locking or interlocking actuation shall be based
on functional requirements of the system. The type of lock or interlock &d
shall be selected from those described in MIPS-24317. One pushbutton station
in a multistation switch shall always be in a down or active position with its :@

associated circuitry activated. Depressing any other pushbutton station shall not
cause deactuation of activated. circuitry until the pushbutton station befng depressed
is positively committed to activating ite associated circuitry.

3.11.12.7.3 Interacting pushbutton stations - H two panels contain the

same functions controlled by multistation pushbuttons, the pushbuttons on each
~el shall fnteract to present the same indication of actuation. Panels with
interacting puehbu~ons shall indicate which crew station has control. Provision
to lock out one set of pushbuttons may be made upon approval of the procuring
agency. ff lock-out of one panel is provided, the lock-out mafe eball be dleplayed
on both panels.

3.11.13 Arrang ement of markings -

3.11.13.1 Orientation - Nomenclature shall be oriented left to right

with respect tn the operator except for the title which will be arrtmged top to
bottom.

3.11.13.2 LaCation - Nomenclature for controls shall be arranged as

indicated in Figure 3. Nomenclature shall not be dbacured by controls when
..
●- “.,)
viewed from the operating position.
,.

1
28

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MI> C-8177U

3.11.13.3 Control position nomenclature arrange ment - Nomenclature. ‘.

which indicate control position shall be placed to relate clearly the position to the
control. At leaet O.375 inoh shall separate control position labels from adjacent
control markings.

3.12 -- Coding shall be used to facilitate identification,

enhance discrimination and mfnfmize error with respect to the location of panels,
legibility of dieplays, and operation of controls within the full range of opera-
tional and environmental conditions. In a new aircraft design, ceding methodology
shall be established for the complete crew station end applied to individual panele.

3.12.1 Special coding applications - Where advantages are to he

gained in terms of human performance, the contractor shall recommend special
applications of ceding pficiples ‘to tie procuring agency. Approval for special
coding methods may be obtained in accofiance with the procedures established
by 3.2.4.2 of this specification.

4. QUALITY ASSUR4NCE PROVISIONS

4.1 Responsibility for inspection - Unlese otherwise specified

fn the contract or purchase order, the supplier is responsible for the performance
I 0) of all inspection requirements as spectfied herein. Except as otherwise specified
I in the contract or order, tie eupplfer may use his own or any other facflittes
I suttable for the perfomna.nce of the inepedon requirement epeoified herein,
unless dieapproved by the Gwernment. The Govement reserves the right to
perform any of the tnepections eet forth in the specification where such inspections
are deemed necessary to assure supplies and cervices conform to prescribed re-
quirements. When required, the supplier wtll provide the Government with test
date.

4.2 Inspection end teeting requirements - The. methods by which

epecitication compliance will be determined are listed for ‘each requirement in
the specification. The metheds are: component testing, inspection, mock-up
review, demonstration, end data review. The contractor shall present evidence
that the required compliance has been achieved in the design. The records of
the tests, tnspectione, end reviews eball be available for inspection by the pro-
curing agency. The teetlog and inspection performed under this specification
shall not duplicate but, as necessary, shsll be fn addition to the teats and in-
spections performed against other contract requirements.

29

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MIL-C-81774A

The Inspection and Teeting Requirements List is coded to indicate one of the
categories defied below

CT Component te8tiUg - All components used in the air-

craft control panel shall be teeted in accorckuice with
the applicable military or contractor specification.
Contractor specifications must be approved by the
procuring agency Pllo? to testing,

I Inspection - Inspection includes the visual inspection

of the panel end measurements of dfmeneions. The
inspection shall also be performed on tbe film negatfve
or film positive, which ebrdl be a true copy of the
panel.

M Mock-up revtew - T%@review ie an hi3@3ctton Of a three-

dimenefoml mmk-up of the panel defdgn and “dl controls,
dteplays, swltdme, ewitch guards, and markings on
the panel. The panel will be viewed with the design
eye relationship as specified to determtne the legibility
and visibility of all markInge and legends, the control-
dlsplay pcsitton relatbnehipe, and the adequacy of the
1“ panel layout and arrangement.

D Demonstration - A demonetratlon shall establish that the

panel or component can perform the functions for whtch
it was designed when installed on an aircraft and
operated by approved procedures. When requested, .a
lighting mock-up review skill be%onduct%d to demonstrate
that the lighting provides suitable vielbilt~ and legibility
under the levels of illmnlnatIon specified.

DR Review of data - Thte category includes revtew end

approval by the procuring agency of the data eubmitted
in reepcnse to the requtremente of 3.2.

90
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MIL-C-81774A

INSPECTION AND TESTING REQUIREMENT LIST

Spec Ification Paragraph CT 1’ M D DR

3.3.1 x

3.4.1 x x x

3.4.2 x x x

3.5.1 x

3.5.3 x x

3.5.4 x

3.5.5 x“ x

3.5.6 x

3.5.6.1

3.5.6.2 x
T
3.5.6.3 x

3.5.6.4 x

3.5.6.5 x

3.5.7 x.

3.5.8 x

3.6.1 x x x

3.6.2.1 x x

3.6.2.2 x x x

3.6.2.3” x x
L

31

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.,, —.— —
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MIL-C-81774A

I INSPECTION AND TESTING REQUIREMENTS LIST (Continued)

I
Specification Paragraph. CT I M D DR

3.6.3.1 x x

3.6.3.2 x

3.6.3.3 x x

3.6.4 x

3.7.1 x

3.7.2 x

3.7.3 x

%7. 4 x

3.7 x

3.7.4.1 x

3.7.4.2 x

3.8.6 x

3.8.6.2 x

3.8.6.3 x

3.8.6.4 x

3.6.6.5 x

3.8.6.6 x

3.6.7 x x

3.8.7.1 x x

.... ●)
32

,., :,
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MIL-C-81774A

INsPECTION AND TESTING REQUIREMENTS LIST (Continued)

Specification Pamgraph CT I M D DR

.3..8.7.2 x

3.8.7.3 x

3.8.7.4 x x
1
. . 3.8.8 x x
-. 3.8.8.1 x x
I
3.8.8.2 x
I
3.8.8.3 x x

3.8,9 x x

3.8.9.1 x

3.8.9.2 x
I x
3.8.9.4

3.8.9.5 x

3.8.10 x

3.8.10.1 x

3.8.10.2 x

3.8.11 x x

3.8.11.2 x

3.8.11.3 x

33

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..-. _. . . .—. ._ ..__
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MIL-C-1317’74A

INSPECTION AND TESTING REQUIREMENTS LIST (Continued)

Specification Paragraph CT I M D DR

3.8.11.4 x

3.8.12.1 x

3.8.12.2 x

3.8.13.1 x {

3.8. 1s. 2 x x
...- . 1
3.9.2 i
.,. .
3.9.2.1 %
x.
3.9.2. 1.1 x

3.9.2.1.2 x

3,9.2.1.3 x

3.9.2.2 x x

3.9.2.3 x x

3.9.2.4 x x

3.9.3. 1.1 x x x

3.9.3.1.2 x x x

3.9.3.1.3 x

3.9.3.2 x

3.9.3.2.1 x x

3.9.3.2.2 x x

34

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I
MIL-C-81774A

I
INSPECTION AND TE9T~G REQUIREME~ LIST (Continued)
I M D DR
sp~tiication parag~ph CT

x x
3.9.4.1

3.9.4.2 x

x
3.9.4.2.1
x
3.9.4.2.2
x
3.9.4.2.3
x
3.9.4.2.4

3.10.1 x

x x
3.10.1.1

3.10.1.2 x

3.10.1.3 x
I
x x
3.10.2
x
3.10.2.1
x x
3.10.2.2
x ‘x
3.10.2.3
x
3.10.2.4 I

x
I 3.10.3
x x
I
i 3.10.3.1
x x
3.10.3.2
I x
3. 10.3.3
I
35
I
,.

I ,.
_.. _
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MIL-C-81774A

INSPECTION “ANDTESTING REQUIREMENTS LfST (Cantlnued)

Specification Paragraph CT I M D DR

3.11.7 x x

3.11.8 x x

3.11.9 x ,x
-.
3.11.10 x x x

3.11.11 x x,

3.11.12 x

3.11.12.1 x

3.11.12.2 x

3.11.12.1.3 x

3.11.12.1.4 x

3.11.12.5 x.

3.11.12.6 x

3.11.12.7 x

3.11.12.7.1 x

3.11.12.7. Z x

3.11.12.7.3 x

3.11.13.1 x x

3.11.13.2 x x

3.11.13.3 x x

3.12 , .x x

3.12.1 x x
36
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MIL-C-81774A

5. PREPARATION FOR DELIVERY

5.1 Preservation, packaging, packing end marking - Preserva-

tion, packaging, pactdng and marking eball be in accordance with MIL-P-7788.

6. NOTES

6.1 ,Intended Us e - The panels covered by this specification are

intended for use in the crew statione of militery aircraft.

1-
“.
6.2 Specification Endorsement Request (SER) - The SER may
only be used te request a change that involves new bmdware or new uses of old
bardware which imprnvee the operabili~ of the .contrel panel. The SER is in-
tended to enable a contractor to apply recent advances of bardware design tn
military aircraft control panels without revising this specification.

6.3 Design Alternate Request (DAR) - Included in the specifica-

tion are items wMch may be used only uoder certain epecified conditions rather
than universally or indiscriminately. Where design altemativea or conditional
uees of hardware are permitted by the specification, their use must be approved
by the procuring activity. The DAR form is designed to facilitate this process.
TMs type of change may not involve either significant improvement or degradation
in design, end the implementation recommended is likely to be a function of opera-
tional condition and specific eyatem requirements. The DAR request has no
implication on costs, schedule, or overall system effectiveness.

6.4 Specification Deviation Notification (SDN~- The SDN ie a

design de5ciency of a eerious nature. It indicates non-corn liance with the
?
specification and may have implications for costs and eystem performance.

6.5 ?~ uments - When the requirements of the

contract, this specification, or applicable subsidia~ specifications are in con-
flict, the following precedence applies.

(a) !2L@@ - The cont~ct SW ~ve w-f-e -r

any specification.
#
0) l%is Specification - This specification sfudl have pre-
cedence over all applicable subsidiary .epeeifications.
Any deviation from this specification, or fmm subsi-
diary specification where applicable, eball be
specifically approved in writing by procurfng actfvtty..
(c) Referenced Specifications - Any referenced specifica-
tion a,ba.flhave precedence over all applicable euba,idiag
specification referenced therein. All referenced
specffketfons shall apply to the extent specified.
37

,4 ,, ,4
:.
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1.
,,
i
.m.
L??!? \B
,... ,..,

,.. - -, ,
,“.

DITU o
-.
.
“*”s-
L?’&.

mm.,nm ZMXS”’

I
I
I
t w
m

...
F
,! ~
W.cnxW i. ....----- .‘

.-

. ..- ,.-,, - — !- ..-.

.W -11---
--, ...-!.-
----
---
-, ,. . —- . — .,. -... !...

1,-I*I I
.., .,,. c
,-,. . ......
... -.,
,, r
.- —... .

PIGURE 1. Control Panel Layout

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MIL-c-81774A
.

i“
I SIDE
\

i ““
,1

II DESIGN EYE

HORIZONTAL vISION LINE

.—-—
OOWN LOOK‘GLE%~
—---f , ~\ / ‘

+’
B ~-’,,, “
—-— ~- —- NSRP —
_-—

k A-

vLEWING ANGLES AND DISTANCE MEASURED FROMDESIGN EYE TO TRE PANEL CENTER
LI - ~Loak.4ngle
LZ - SMeLeakAnsle
DI - Distance (l’rue)from ~Si@ Eye tOn~l ce*r
bfEAEURE~NT FROM NSRp MEAmRED TO PANEL CENTER
D2 - HotiZOII@ Ma=u-ment
IZ@.rd Measurement
% -
D4 - vertical biaisurement
PANEL UJCLDJATION- (MEAWRED NoR~L ~ NsRp AxEs)
From Horizonbd Axis
From Vertical AXIS
From Zatend Axis

lMBIs.uEye and NSRP - % MZL-~D-L933.

FIGURE 2. Panel Location and Viewing Data

..~.
-—_
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M2L-C-81’774A

x EXTENO .12 PASS KNOB SKIRT

T-,.c&D&s,R~o
.06 UNOER SKIRT

FIGURE 3. Panel Markings

40

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MIX-C-81774A

!:

EIEIEI H
EIEIEIH
Elm El@
‘* )
Emle
I .’

?,

)$

FIGURE 4. Keyboard Arrangement

41

I ..
. . ...-— ..=
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MIL-C-81 774A

TYPE A KNOBS

TYPE BKNOBS

TYPE C KNOBS

FIGURE 5. Control Knob Shapes

,,
‘m

--
 Downloaded from http://www.everyspec.com
,, , -, .

TABLE L
CONTROL SELECTION CHART

,.
t CONTROL

Toggle Push Bar Round Tbumb- Thumb-

FUNCTION
Zwitch Button Knob Knob Wheel D Wheel C

select system. power state ON-OFF 1 2 3 x x x

..,. select between oFF/prime MOde/%cOndW Mode 1 3 2 x x x

Zekt one or more of N related functions 3 IA 2

2elect one of N mutually exclusive functions any omier 1

Multiple

Wed one of 3-24 discrete akernati vis - sequential 1

otim

Wect digit - discrete 1 Ke.vbd 2 1

select function and mflin~in if and Only if systcm 1

accepta 8election. Sal Held 1

Select range - continuous 1 1

i
select range ~ discrete stePs 1 2 1

Bekt operating condition 1 2 2

.,.

Enta alpha-numeric data 1 Ke@d 2 F

A
fnitlnte test subfunction 1 1 3
A
1-
1 -1
fnitiate directional function 1 2“ “3
2
hlultiple s
*

) ., ,, -...*,..!. .~. _ ._
.,, ... .,. ~, u..,, ,., ..., . . . .
.,,. .,., ., ...,, ..-.. l..- . . . . . .
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TABLE 1.
CONTROL SE LECTfON CRART (Cent’d)
B
A
~
CONTROL 4
s
Toggle Push S3r Round Thumb- Thumb- *
FUNCTION Switch Button Knob Knob Wheal D wh2el c

Step from one cOndftimto mother 1 1 3

slew canters or other mmerfc readout 1 2

~. 1. 3 “3
@t momentarydfscrete
Reset discrete dIEplaY 1 1

fntermpt sequence- matntafn 1 1 3 3 3

%
En- - Dfaengnga sut@Jmct20n 1 1

Adjust li@t level cont. 3

3 levels 1. 2
mex.
Adjustaural level 1 2

Comae adjustment 1 mmll 2

Adjustfnput/aIt# ~er c~-~~ ~w 1 2

F2neadjustment 1 large 2

~11 Wnlal Slgmd 1 2 ‘

,., Nullaural signal 1 2’ ;
4 s

I
_
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@ @
.’,
,,.

a
TABLE IL
CONTROL CHARACTERISTICS
,,

CONTROLTYPE SIZE DISPLACEMENT RESISTANCE

TOGGLESWiTCH-
Regldm Height 0.69 + 0.03 2 Pesition 33” ● F Easy15 +50z.
‘ripDi~. 0.24*0.003 3 Position Hard 30 + 5 oz.
Total 33” * w
Adjacent 17” ● .T

Lever lock Height 0.95+0.05 2 Position 33” * 5“ 30’+ 10 oz.

Tip Diam. 0.42 +0.03 3 Pesltion 30 ● 10 oz.
Total 33” * 5“ Lift to overcome lock
Adjacent 17” *Y
lb
m
Subminiature (SM) Height 0.44, + 0.025 2 Poeition 42 + 6“
Tip Diam. 0.093 + 0.003 3 Poeition 20 ● 5 oz.
ToW 42” + 6“
Adjacent 21” * 3“

Solepoid Held Height 1.06+0.05 2 Position 3~ * 5“ Minimum 10 oz.

Tip- Reckngular 3 Poeition Maximum 4002.
.1875 X.375 Total 30” * Y
Adjacent 15” * 2

PUSHBUTTON-
Momentary Diam. Minimum 0.375 “Minimum0.125 15*50z.
Maximum 1.000 Maximum 0.500

Holdi~ Smallest Dimenzion

Minimum 0.500 Minimum 0.25 30 ● 10 oz.
Maximum 1.250 Maximum 0.500

. .,, ,,, .,,, . .. .. .. . .. .. . .. ....+ ,.., ,...... . ... -

–-”” 22~’” “’”” “ “q’ ““”’=“’”” ““’”
-
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TABLE If.
I CONTROL CHARACTERISTICS (cord’d) 8

m
.

CONTROL TYPE ; SIZE DISPLACEMENT RESISTANCE

Rotary Select Knobs { Length l.00-l.50 1 -3 inch pounds for

(Type C) I Width 0.250-0.750 1-inch knobs
Height 0.S75 -1.00
SEE TABLE III 1 -5 inch pounds for
greater than l-inch
knobs

Continuous Rotary Knobs Diameter Less than 360” - Type S3 1 -4.50 inch oz. for
(Type A, B) : Minimum O. 500 knobs less than I
More than 360” - Type A
Maximum 1.000 inch
/ Height 2 - 6 inch oz. for
Minimum 0.500 knobs 1 inch or
Maximum 1.000 greater

THUMBV@EEL -
Discrete Diameter 1.00-3.00
36” between positiom Minimum 15 ● 5 in. oz.
Height
Minimum 0.125 Maximum 30 ● 10 in. 02
14fwimum 0.375

Continuous ~ Diameter 1.00-3.00

Height
Minimum 1 in. oz.
Minimum O. 125
Maximum 0.375
Maximum 5 in. oz.
1
Width
Minimum O.125
Maximum 0.375

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MIL-C-81774A
TABLE XII

KNOB DETENTS PLACEME~ FOR VBUAL POSITIONING .“

;
ECOMMENDED RECOMMENDED ECOMMENI ) STARTING PCIHTION ,:
rOTAL ANGULAR RADIUS FOR ZGREES)
NO. OF REPLACEMENT 1/6” sEPARATION lGHT-HAND LEF7-HAND mimr
;ETTLNGS (DEGREES) (INCHES) IPERATION OPERATION IIAND

3 40.00 0.537 264.00 16.00 320.00

4 37.06 0.580 254.65 354.17 304.00

5 24.52 0.622 246.58 335.34 290.96

.6 32.31 0.665 239.54 318.91 279.22

7 30.36 0.708 233.35 304.49 266.92

8 26.64 0.750 227.86 291.66 259.76

9 27.10 0.793 222.96 2S0.24 251.60

10 25.72 0.836 218.56 269.9S 244.26

11 24.47 0. 87s 214.59 260.71 237.65

12 23.33 0.921 211.01 252.36 231.68

. .
13 22.30 0.964 207.72 244.68 226.20

14 21.36 1.006 204.70 237.62 221.16

15 20.49 1.049 201.94 231.20 216.57

16 19.69 1.091 199.40 225.25 212.32

17 18.95 1.134 197.04 219.76 208.40

18 16.26 1.177 194.67 214.71 204.79

19 17.62 1.219 192.S5 209.99 201.42

20 1’7.03 1.262 190.92 205.50 196.21

21 16.47 1.305 169.18 201.42 195.30

22 15.95 1.347 181.52 197.52 192.52

22 15.46 1.390 185.96 193.92 169.94

24 is. oo 1.423 180,270 0,90, or 0 or 180

or 360 180

47

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MIL-C-817.74A

TA”BLE IN

KNOB DETENTS PLACEMENT FOR TACTUAL’ PCHTI~ING

RECOMMENDED RECOMMENDED RECOMMENDED STARTING PCLWTION

TOTAL ANGULAR RADII!9 FOR (DEGREE6)
NO. OF DX6PLACEM.EN2 112” 6EPARATION BIGHT -HAND LEF2-RANLI EITHEK_
iElTIN02 (DEGREE2) (INcHm) OPERATION OP?IiIATION RAND

3 40.00 0.716 264.00 16.60 320.00

4 38.57 0.743 262.29 351.00 302.14

5 37.24 0.769 243.31 321.72 285.52

6 36.00 0.796 234.00 306.00 270.00

7 34.84 0.823 225.29 285.67 255.46

8 33.75 0.649 217.13 266.62 241.87

9 32.13 0.675 209.45 248.71 229.08

10 31.77 0.902 302.22 231.85 217.03

11 30.80 0.928 195.42 215.98 205.70

12 30.00 0.955 180,270, ‘0,90 or 00r]LVl

or 360 160

48

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49
.

MIL-C-81’774A
.-— —

$
 1’
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I
.N

\
m.
\

“
.
.:

50

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MIIrC-81774A ~
! t
“i~ APPENDIX A

FORMAT FOR CONTROL PANEL DATA

1:

1. = - Thedeta item8de8cribed bytheappenti sball.be used to submit

I
data, todocument desigoand human engineering activities, aodto request design
changes. The data shell be submitted tn the form end format shown on the followfng
pages.
.,
1.1 Panel Des @n Package - Tbe Panel Deeign Package shall be used to fulfill”
the data requirements of 3.2.1 end shall consist of the following

(a) Panel Drawtng (PDP-1)

i .,

@) Pilm Positive and Film Negative (PDP-2) (See Section 20 of thts appendix)

(c) Controls List (PDP-3)

(0 Displays List (PDP-4)

1.2 Humeo Enulo eering Date Package - The Human EngineerLog Date package
shell be used to fulfill the data requirements of 3.2.3 end shall consist of the

a followlng

(a) panel Functional Description end Rationale Dete (HED-1)

(-m panel Locatton end Vtewing DSta (IDzD-2)

(c) Abbrevietton, Legend, end Symbol List (HEW3)

,. (0 Coding Data (HED-4)

1.3 Eiidoreemente end Deviation Dabi - The Endorsements end Davia@ons

DSte shalI be used to fulftll the data requirements of 3.2.4 mid shell consist of the
fol.lowtng

(a) Speeiftcatton Endorsement Request (EDD-1)

(b) Design Alternate Requeet (EDD-2)

I
(c) Specification Deviation Notlficatlon @DD-3)

51

..
.—. . .. .
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A/C type Contract No.

PDP~l ●)
.

Page _ of _

PANEL .DRAWING

-el Idanttficatfoo:

1. Panel Title 2. Drawfng No.

3. Procurement flpeciflcation 4. Aircraft NOB.
I 5. Contract No. 6. Wbmittal Date
7. -red by 8. Phone No.
I
.-—. -—----— .-_. ---.-— ------- -—.-—---—--------. ----- ..---- —----

Attach to copy of drawing dmcribed tn 3.2.2.

For.uee of”* Dept. anly.

Approved (mg: )

Disapproved
-------------——----— ------- ‘Sg;)
● Army Do nnt use
Navy
Air Force
52
(as applicable)

I ,.,
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1

buL-C-81774A

PDP-2

A/C type Contract No.

Page _ of _

FILM P061TIVE AND FILM NEGATIVE

~el Ideniiflcation:

1 “.
1.
3.
panel Title_
Procurement f@e~flca~on
2. Drawing No.
4. Aircraft Nos.
5. Contract No. 6. Submtttel Date
7. Prepared by 6. Phone No.

.-----------— _--- — ---------- -------------------------------------------

Attach to film positive end negative.

I
,,
,,

For use of ● Dept. only

Appreved (Sig. )
I

* Army ~
Navy
Air Force
53
(ae applicable)
I
.,
. . . ..- -. —.——
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MIL-C-81774A

PDP-3
●-)
A/c type Contract No.

Page — of __,

CONTROLS LWT
Penel Identi%catton:

1. Panel Title 2. Draw No.

3. Procurement *ecificatton
4. Aircraft Nos___
5. Cootrect No.
6. Submittal rnte
‘7. Prepared by
8. Phone No.
------- —------—-— —--. ——-—-—----_— ----------------------
Lfat all controls and describe tbkir pbyaical cbaracterftic.g.

COntrd Type Force Rlze D@Iace. hf6 ● use onlj

b Panel Noreen. Character. CImracter. Character Number A D
— —

For use of ● Dept. ody

Approved (Sig. )
Dtsappmved (Sig.”
---_._ —----------------------
● Army Do not ace
Navy
Afr Force

(as applicable) 54

..__ —. ___ ---- .— _______

.
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MIL-C-81774A
PDP-4

A/C type Contract No.

Page — of_

DISPLAYS L3.6T
‘1
,. panel Identification:
\ 2. : Drating No.
1. panel T3tle
Procurement specification 4. Aircraft NOS. _
3.
5. Contract No. 6. Submittal Date
7. prepared by 8. Phone No.

--------------------------------------------------------------------------

L3et all dieplaye aad described their phyeical charecterietice.

Night Day MS * uee onty

isplay Type (i Contract
Brigbtnesa 3rlgbtneee Number AD
aael Noreen.

For uee of * Dept. OotY.

Approved (S3g.)

Disapproved (S3g;)
-------------------------------------
● Army Dn not use

1
Navy
Air Force
p (ae applicable) 55

..
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MIL-C-81774A . .

!ED-1 .,”)
A/C type Contract No.

Page of._

PANEL FUNCTIONAL DESCRIPTION AND RATIONALE DATA

A. Panel Identification

1. Panel Title 2. Drawing No.

3. Procurement Specification 4. Atrcraft Nos._
5. Contract No. 6. Submittal Date
‘i’. Prepared by 8. Phone No.

9. Package Summary: B)_ Mges; Q_Pages; D)_ Wi3es; E)_Hee

-------,---- ----------------------------------------------------------
B. Panel Funct@d Dascr@iOn:

Briefly describe system function of the panel aad its major subfunctions In
term8 of operational We.

(1) System Deecrfptlom

‘a)
(2) Major Functions:

(3) .~rat.tng procedure:

(4) Enter criticality code for appropriate miselna pbaee:

1-RrnMne; 2-Affects CEP; 3-Affects flight safety; O-not used.

Preflight Takeoff ClimbOut Cruise Refuel

Weapone Delivery Approach Land
Other (explaio)

(Use other sheets as required to complete Item B)

56

,,
— _ -. .. —---
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PANEL FUNCTIONAL DXRIPTION DATE (Item C)

CONTROL & DISPLAY RATIONALE

““...

* uae ooly
c D NAME FUNCTION RATIONALE A “D

,..:

(use as many eheets as required) ● Army

Navy
Air Force
(as applicable)

. .. .. . .. . . . -. .,,
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.rQ-L-&S1774A ,.. .
1 iilm-1 @

D. Error Prevention end $efety Precautions

}
(1) Identify ALL controls on the panel which could introduce
hazarda lf NOT properly operated.

,.

.,

(2) Describe measurea taken to provide protection.

(Use additional forma as required. )

58

.—. .. . .. . _____ -_ . ,.
—
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-C-81774A 1.
IDID-1
.;
Page —of—

E. Human Factors Design Data Base:

(1) Identify by title, report number, submission date, and page, tbe
human factore data upon which this panel design ie based:

(a) Functtonel Allocation:

(b) Task Analysis:

(c) Control/Display Requirements:

i
(d) Operation Sequence Data:
------------------------------------------------------------
e
Prepared by , .
Title

ApplW7d by
Title ,
Date

For uee by * “ilept. cnly

Approved (Sig. )

Dieapproved @g. )
-------------- .----------- _-—------
I * Army Do not use

Navy
● Air Force
i “
1!
(as applicable)
59

—-. —.
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MIL-C-81774A

fiED-2
●)
A/C type Contract No.

Page —of—

PANEL LOCATION AND VIEWING DATA

A. penal kkkifiCetiOIU

1. Panel Title 2. Drawfng No.

3. Procurement Specfffcatbn 4. Aircraft Nos.
5. Contiti No. 6. Subrnittzii IMe
‘7. pre~red by 6. Plmne No.
___ ------ —- —— -------- ----- . --- .-—---- --------------- ------
B. Panel Location:

1. Pcnel Size: x 5.75.

(Mark out non-applicable directinn reference. )
2. Dtetance Forward or Aft of NSRP incbee.
3. Distance Rtght or Left of NSRP fnchea.
4. Distance Above or Below NSRP fncbes.
5. Reach Zone (See MIL-STD-1333:)
Reach dietance to the most distant control is inchee.
Reach dtstance is the eherteat distance from a line projected
vertically from tbe NSRP. (See MIL-STD-1322. )
6. Incllaation angle from Horizontal (Waterline Plane).
7. Inclination angle from Vertical (Station Line Plane).
8. Inclination angle fmm Vertical (Buttltae Plane).
---------------------------------------------------------------------
C. Panel Viewing “Data:

1. Location of eye reference pcdnt wtth reepect to the NSRP:

inchee akave SRP, fnches forward of NSRP.
2. Viewing distance to @eel center fncbea.
3. Dewn angle frem bcrlr.ental vfeton line o.
4. Side angle .frexn bcrlr.entel viaien Une 0.

-------
--------------------------------------------------------- -----—-
J?repared by Apprnved by Da@_

● Army

Navy

Air Force

(as applicable)
60
e.., ( s% !
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MIL-C-8177M

HED-3

A/c type Contract No.

Page_ of

HUMANFACTORS ENGINEERING DATA

ABBFIE~TION, LEGEND & SYMBOL LIST

A. panel Identification:

1. Panel Title. 2. Drawing No.

3. Procurement 3peciflcation 4. Aircraft NofJ.
5. Contract No. 8. Submittal Date
7. Prepared by 8. Phone No.

9. Package Summary B)_@ges; C)_ pagee; D)~agee; E)~ee I

---------------------------------------------------------------------------

B. Liet in alpbabetkal order the abbreviations used on the panel and complete data.

New * Uae Only . ..’

,bbrevlatton Word(e) Source (check if ap. ) A D

* Army

Navy
61
A“ir Force
I ( ae applicable)
I
!
.- . -—.. .
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HED-3 @)

Page —of_

c. For new abbreviation: The following sources have been checked for other
meanings for the abbreviation chosen:

No other meaning has been found. @g. ) .

I APproval is requested for the fotlowiog abbreviations:

● use onlY
Abbreviation Word Reason Abbreviation Cimsen A D-

0“)

* Army
Navy
Air Force
62
(as applicable)
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MIL-C-81774A
HED-3 ,.

Page_ of_ ~

D. Le@md Identification

* UI only
Display Name Legend Meaning A D,

1“
..

I
w

1.

..-

,.
,“

i“

I
* Army
,1 Navy

~ 9 -
) Afr

(as
Force

applicable)
63
. .

I
I ..
-..—. .. . I
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MII.-C-81774A
—.

Page —. of —

E- Symbol Identi5catton:
Identi& and defie the meaning of”all dts,play eymhola used.
(Provide eketch: )

Army Do not use

1:
Navy
Air Force
. .. .
(as applicable) 64
0)’

.- . ..— -—.—-
1
 Downloaded from http://www.everyspec.com
I
,
&-C-811T4A
i
HED-4

“ QJ i
A/C type Contreet No.
. .
(
Page— of— i

CODLNGDATA

A. Panel Identification.

1. Paael Title 2. Drawing No.

3. Procurement *citication 4. Aircraft Nos.
5. Contract No. 6. 6ubmittd Date
7. Prepared hy 8. Phone No. i

9.. package summary: B)_ wee; Q —Hes.

!.. ----------- -------------------- -------------- ----. -- ——-------—---— -_ -.
B. Ccdiag methods need for panel, general description:

● Use Only
:odfng Method A D

I ..

I (If addlti d apace,is required, use eddltlonal sheete. )

,!

* Amy

Navy 65

Atr Force

lee epplicable~

.
:----
 MII.-C-61774A
HED-4
Page_ of_
● ))
‘
I f
1,
,,
Downloaded from http://www.everyspec.com

I
For use of ● D@. my
APPr&xf (Sig. )
Disapproved (fag. )
--------------------------------
● Army Do not use
Navy
Air Force
(as applicable) 66
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Ml~C-81774A I
EDD-I

A/C type Contract No.

1

page of _

SPECIFICATION ENDORSEMENT REQUEST

.,.
1
panel Identification:

1. panel ,~tle 2. Drawing No. ;

4. Aircraft N08.
3. Procurement Speci5cation
6. Submittal Date
5. Contract No.
8. Phone No .—
7. Prepared by
-----------------------------------
------------------------------------------
of specification MIL-C-81 774.
AO endoiwement is requested ti paragraph_
The following data are submitted to justify the endorsement.

J
A. Detailed description of change:

B. Justification
1. Reaaon for change:
Ii

1!

,1
!

I
.

,* 67

.
- .—J
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MIL-C-81774A
EDD-1 ●?)
-

mm_ of_
-------------------------------------- - . ------------------------ — -----------
Fur Offklal Use Only

Date Received coQlhard A@Icy

Reviewed by Title
IB3te
,’

Canments and IUScomi5eridatfons:

‘e
.!

SER Approved Disapproved

Sigaatuxw

Title

Contrectcm notified (date)

For use of * Dept. only

Approved (Sg. )

Disapproved (Sig.)
------------------------------------
* Army Do not use
.
Navy
Air Force . ● )

(as applicable) 68

-.
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MIL-C-81774A
,-. ...
EDD-2

Contract NO.
A/C type
Page_ of_

DESIGN A.LTEmATE R~UEST

I
panel Identification:

2. Draiving No.,
1. panel Title & .-.-.
=. .ii.m.nft –-tNos.
3. procurement’s ~cification
U. ‘-’–ittal
Ouum Date
5. Contract No. ml.... ..-.
N.
8. k-uuu-
‘I. prepared by

---------- ------------------ -----—------- -

-------------------------------- -

Approval of the design alternative descfibed below ia r~ueat fOr pere@ph-.

69

. ..
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MIL-C-81774A

EDD-2
0’)
Page _ of -

---------------------------------------------------------------------

B. Justification:

1.. Reaecm tbr changfx

,
I
I

e“ ,,
I

--- — -- — ---------e -------- --. -------------- —----— ----— ------------------

c. Requeet fnitiated by.

‘lWe

70
I

I .,*
. .
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M1>C-81774A

EDD-2

Page —of_ 1
----------------------------------------------------------------------------
For Offl&d Uae Only

i
~te Received Coguizaot Agency
Reviewed By Title .:
,.
Date ,.
I

~“ Action T&en:

Commente end Recommendatlone:

.
.

For use of * Dept. Only

I
Approved (2ig. )

● Army
Navy
Air Force

9“ (as applicable) 71

,.
1’ -. .-. ..-
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MIL-C-81774A .

EDD-3 0))
‘

A/C type Contract “No.

page of

SPECIFICATION DEVIATION NOTIFICATION (DATA)

Panel Identification:
1. Panel Title 2. Drewlng No.
!
3. Procurement Specification 4. &creft Nos.
5. Contract No. 6. Submittal 3X@
7. Prepared by 8. J?hQw3~0.,
------------- ----------.-------_- -------------- -----—-------------- -------

Complete, detailed stetemente must be provided for all of the items below. Attach
addltlomd sheets “if more space is requtred.
,)
A. Describe the,problem. (why is it impossible for you to comply with tbe
specification?)

----------------------------------------------------------- ---—-------- -

B. What alternative solutions have you considered? which were successful, and
whtch fafled? Why dld they fail?

72

1 —-
———.
.— .-
———
— —
—________.< 1
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EDD-3

Page_ of_

----------------------------------------------------------------------------
“~
i. .,
C. What is your recommended solution? ~Y ?
-“ ‘

-— ----------- -------------------------. ------------------------------------

*
D. How will the recommended eolutlcm affect eyetam performance?
.,

73
I

-------
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MIL-C-81774A , .,,
EDD-3
,0-))
Page _ of_

-------------------------------- --------------------- —--- —-------- ---------

E. !ow will t% recommended solutloo affect syetem operabili~ ?

-— ------ ----------------------------- ----- —------------ ----------------- --

@
F. rf the proposed soIution till de~de sYs@m perfo~ce or ope~biIi&s what
prvvieiona do you recommend to compensate for the de@tion ?

74 0)
+.
i .:. ,.
—
..
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_C-8177M i
EDD-3
,
Page of I
——

----------------------------- = ---------------------

G. How will the recommended solutton affect prog~ schedule? 1

.’

-—
------------------------------------- t
-------------------------------
--
q) H.. .SVill the recommended solution affect cost: Yes — No .
----------------------------------------------------------------------------
‘
I. Requeet inttlated by Title

a .) J 75

.... ...
—.. ..— — ---A.
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MIL-C-8177ti
EDD-3 0)
Page — of—
----------------------------------------------------------------- -----------

For Official Use Only

Date Received Cogntsant Agency

..; Title
I Reviewed by

I
Comments end Recommendations:

0)
I

e
For use of * Dept. OnIy
1

* Army
Navy
‘
Air Force
(as applicable) 76

I -.. ., ...
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MI-L-C-81774
APPENDIX B

PREPARATION OF rwARKfNi3 PLATE FOR AIRCRAFT CONTliOL PANELS

1. S= - These are the requirements for the preparation of control panel

IDW@3 artwork sod the ,negative me~g plate.

2. REQUIREMENTS

2.1 General Requfrementa -

2.1.1 Materials - Mat&lals shall’ be of htgh grade commercial qualtty

entirely suttable for the purpese intended.

(a) Artwork - ~rir shall be on a transparent stable base matefial wtdcb

I -he rcquiremeats for Type fI material of MIL-D-851O.

0) Negntives - The negatives stadl meet the requirements of MIL-D-S51O.

2.1.2 Preparation of artwoIIK - The artwo~ shall be made by applyfng all

rnarkinge fndtcated in the coordination drawtng or other preliminary drawing to a
sheet of transparent stable material. The sheet shall be at Ieaat three inches
larger fo each dimension then the control panel face (see Ngure B-l).

(a) Cmp marks - Crop marks to locate the corners of the control panel are
positioned on the artwork.

@) Cutout ceoters - The cutout centers are to locate all cutouts for the
control panel aod also to locate on the mounting plate the matching
cutouts. ‘rfM cutout centere shell be applied to the transparent
Sheet se indicated.

(1) Cutout rnde - All cutoub wfdch appear in the panel must be coded,
i.e. , ,,A,,, ,,B!IOI!c,!, see Ikb3il A. etc. -

(c) Markinge - All markings whtch are to appear.on the panel face shall be
aPP~ed te the stable material. The markinga shall be produced by a
I
photegrapldc” metbed whtch shall be on clear material with adhesive
backtng. The nomenclature rnarktngs shall be made of a type pro-
duced by a Fotmettcr machtne or equivalent to the required size.

Lfnes, clear area under kmbs - These markinge may be preduced

by other means than photographic methode. However, theee
markings must be accurate and opaque.

●✞ 77

-, ~.
.— “.—
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MIL-C-81774A

(d) Preparation of negatives - The artwork is reproduced by a photographic

transfer process tc produce the marking negative. The reproduction
shall meet the requirements of MIL-&5480.

3. QUALI~ ASSU~NCE PROVfSfONS

3.1 Inspection and acceptance - Inspection and acceptance shall meet the
requirements of MIL-D-851O.

4. PREPARATION FOR DELlVERY

4.1 Packagin ~ - Packaging shall meet the requiremeote of IvIIL-D-E51O end

f&L-D-5480.

5. NOTES

5. I Iotended use - The artwofi and resul-g negatives covered by tMs ~~d-
fication are used fn the dedgo of control panels io accordance with MIL-C-81774.

I 5.2 Demitions -
1’

5.2.1 Control Panel Coordination Layout Drawing - Layout or sketch of the

proposed avtonics panel face.

5.2.2 Artwork - Markings applied to the stable materhd.

5.2.3 Mounting plats - Afetsl plate to whtch the control end edge-lighted
pemel are attached.

5.2.4 Crop marks - Marks wbtch de5e the perimeter of the panel.

5.2.5 Check PO~W - Control dimensions added to the undimensio Md production

drawing so that size and stability of the negatives maybe checked both laterally end
longitudinally.

’78

, ., . ..
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MIL-C-8177M

Cutout Center Photo TyPe Crop Morks

Code for Cutout

I \_ I
—, \
ENG FEED FwO TANK TRANS
FwO &UTO
Y + +B ,
INBO I ,OUTBO
“i” \
+’ NORM +A +0

+’
F AFT

u# +
+C
E TEMP
L ~ OPEN ‘OOR DUMP

+E -?* +“
P +6 “.

CLOSE OFF
+C

I I
FIGURE B-1. Artwork Sheet Sample.

Cuatodiaoa: Preparing activity:

Army - AV Navy - AS
Navy - AS Project No. 1680-0266
Air Force -11

79

.- -. . . .—--
 --- - ..-. _ —.
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rtumx

Paragraph Page

1. SCOPE

1.1 P~se . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .. . . . . . . . . . . . 1

1.2 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 1

2. Applicable DOCUMENTS ................................... 1

3. REQUIREMENTS

9.1 De@@ . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 4
1, 3.1.1 Approval ........................................... 4

3.2 Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.2.1 Control pauel layout . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . s

3.2.2 Film posit4ve and film negatives . . . . . . . . . . . . . . .. . . . . . . . 5

3.2.3 Human @et.or deslgo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2.3.1 Panel fimciionel deeoriptim ........................ 6

3.2.3 .2 Pael IOcaQOn(s) . . . . . . . . . . . . . . . . . . . . . . . ..i . . . . . . . . . . 6

3.2.3.3 Viewing ........... ..... ................ .......... 6

3.2.3.4 Legend description ................ ...... ..... ..... 6

3.2.3.5 Coding ....... ........ ................. .. ......... 7

3.2.3.6 Crew atetlon oontrolpanele arrangement ..... ....... 7

80

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Paragraph Page
‘* “.
3.2.4 Specification endorsement data . . . . . . . . . . . . . . . . . . . . . . 7

3.2.4.1 Spectficatton En&reement Request (SEQ ........... 7

3.2.4.2 Design Alternative Request @A~ .................. 7

3.2.4.3 Speciflcattin Deviation Notification (SDN) . . . . . . . . . . . 7

3.2.4 .4 Procuring agency approval . ... . . . . . . . . . . . . . . . . . . . . 7

.
3.2.4 .5 TrensdsaionofdSta ............................. 8
I
3.3 Materials . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.1 Anti-reflective C@ing ............................. 8

3.4 , Moanting ................................................ 8’

3.4.1 Control end display mounting ....................... 6

3.4.1.1 Toggle ewitches ................................. 8

3.4.l.2Puehbuttons ..................................... 8

3.4.1.3 Knobe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . 8

‘1

3.4.1.4 Thumbwheels .................................... 9

3.4.1.5 Ftnger operated control levers .................... 9

3.4.1.6 Legend lights .................................... 9

3.4.1.7 Eleotro-mechanical and eleetro~mcd indicators ... 9

3.4.1.6 Digital dieplays . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4.2 Guards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 9

3.4.2.1 Frangible gUaTdS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

,

81

.,. .,
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.. . . . . . . .-
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Pamgreph ‘Page

9.5 Color . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . 9

3.5.1 Opaque colors :(refktieti) . . . . . . . . .. .. . . . ... . .. ... . ..... . . . 9

9.5.2 Color of li@te .. ... . . . . . . . .. . ... . . ... . . . .. . . . ... . . . . . . . . . 10

3.5.3 Lighted Panel ..... . . . .. . . . . . . . . . . . .’... . . . .... ....... .... ... . ... .. 10

3.5.4 M&mtiog.phlt.e . . ... . . . . . . . . . .. . . . . . . . ... . . . . . . . ...... ..... ... 10

..
3.5.5 FaSt%neYs ...... ... ...... . . . . . . . . . . ... . . .. . ...-.+.. ... .... ..... ““lo

3..5.6 @MB?ti~ ...... ... .. . ... .. . ...... .... ... .-.%-.,...+%~,.~.,.~.

.. *-.. .. . ,. .... W%* Xo

3. 6.’6.[1 ~tiil~”d<~Oii~~~ -.,. $.,.,.. .... .. ... . . . . .-...,...,.’.-.-.. “10

3.5.6.2 “TIWiiSiWimMa&,$@~-~ .,.~... . ..... ............ .. . .%...*. “1O

-S. 5.6.:3 .Non-trensllMdlnat6~ @Sbbtittdm . ... . . . . ... . . .. ..... . .. 10

3.5.6.”4 Tog#e :aWititie& ..... ..... . . . .. . ... . .. .. ....... . ...... . .......... . -

3.5.6.5 i3xy@n4rivWb @r l&ve”r) ... ............. .,.-.-.%.-. . ........ .....

9.5.7 Pahell$l@ltlh@ .. ...... ... . . . .... ... . . . . .. ...... . ..-.=-.. ...

3.5.tl”ihilmifi3 ...-. .....-.> ...-. . . . .... ..- . .....- ....w..i... ..w.-.

.... . ... . . . .,.~$-

.9;6 ~~ . ... . .....-.-.-9... ....... ........... . . .. .. . ..... . .. .... .. .,.,. ..%,.-.... .. ... . ... . .. .
,.
3.6.1 Lt@tetl’~-ml . .... . . . ... ..-.!. . . .. .. .. . . . . . . .,../.-.%-.....,.%..... .

3.’6.2 Contr& . .... . . .. . . . . . . . . .. ... .. ... . . . . . . . . . . .... .’.’. .’.’. . . . .“.

3.6.”2.1 “P@3ibutt&riB . . . . . . . . . . .. . . .. . .......... .. . . . .. . . . ... ..... ... ...$.

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3.6.2 .2 Knobs ........................................... 11

3.6.2 .3 Tbumbwheels ....................................

,.
3.6.3 Dieplays ..........................................

3.6. ”3.1 Mechanical indicators ~d di@~ d@aYs . . . . . ... . . .

3.6.3. Z Aircrew station signals .......................... 12

I
3.6.4 Flashing lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ●. . 12

3.7 Markings . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.7.1 Style end size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.7.2 Punetuat!on and symbols ........................... 13

3.7.3 Unrelated markings .... ..... .. .................... 13 ..

,-
3.7.41@tedpanels .. .. ................................. 13

3.7.4 .lLtnes .......... ........ .............. ........... 13

3.7.4.2 Iacatlon .. .... .... ........... ................... 13

3.8 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 13

3.8.1 (lpereblli~ ..... ........ .. ..... .................... 13

3.8.2 Protection from accidental activ~n ................. 13

3.8.3 Maintiaability end reliability ....................... 14

3.8.4 Consistency . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . 14

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3.8.5. Conservation of panel epace . . . . . . . . . . . . . ... . . . . . . . . . . . . 14 .

3.8.6 Control selection .................................... 14

3.8.6 .l. Basic selection criteria ............................ 14

3.8.6.2 Lever-lock toggle awitchee .......................... 14

3.8.6 .9 Miniature toggles ....... ........................... 14 .

3.8.6 .4801enotd-held toggles .. ........... ....... ........... 14

3.8.6.5 Combtned legend light /puehbiztton ................... 14

3.8.6.6 Conoentrto kmbs . . . . . . . . . . . . . . . . . ...”.. ............. 15

3.8.7 Toggle awltoh oharacttirist.ics ......................... 15

9.8.7.1 Codtng ............................................

9.8.7.2 Momentary ~le mvttohes (eprti loaded) . ...........

.9.8.7.3 8olenoid-held ta#es ............................... 15

3.8.7.4 Lever-look awttches ............................... 16

3.8.8 pushbutton charaeterlatics ............................ 16

3.8.8.1 Aetuatlon .......................................... 16

“3.8:8 .2 ShaPeood@ . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 16

3&8’.8.3 Keyboam3 p~-n cbatict.critics -d vfeual verifica-

tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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3.8.9 Discrete rotary control knobs . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.8.9.1 Knob ahape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.8.9.2 Knob size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.8,9 .3. Number ofpositlons ............................... 17

3.8.9.4 Displacement ..................................... 17

I “
3.8.9.5 Starting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1’7

3,8.9 .6 Grasping surface .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

I 3.8.10 Ttmmbwheel selectors, discrete ..................... 18

.
3.8.10.1 Number of positions ............................. 18

3.8.10.2 Thambwheel shape ............................... 18

3.8.11 Continuous rotary control knobs ..................... 18 .

3.8.11.1 Sbepe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1

3.8.11.2 Knob sldtie ...................................... 18

3.8.11.3 Concentric knobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.8.11.4 Knobs Incorporating a ewitch poti~on . . . . . . . . . . . ..-. 18 ,:

3.8.12 Continuous rotary thomhwheels ...................... 19

3.8.12 .l Shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............

3.8.12.2 Dimensions ..................................... 19

3.8. 13 Levers ............................................ 19

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3.8.13.1 Levers for finger operation ...................... 19

3.8.13.1.1 Limb support . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . 19

3.8.13.1.2 Size ......................................... 19

3.8.13 .’1.3 Resletance . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . .

3.8.13.2 Hand controllers . . .. . . . .. .. ... . . .. . . . . . . . . .. . . .

3.8.13 .2.1 Limb euppnrt ................................ 19

3.8.13.2.2 Sise . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . 19

3.8.19.2.3 Resistance ................................... 19

3.9 Dieplays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.9.1 Information ........................................ 20

3.9.2 Display aelectton rqulremente . .. .. .. .. . . . . . . .. .. . . 29. *.

3.9.2.1 Legend ll@ta .................................... 21

,,
3.9.2.1.1 Combined legend Mght/pushbutton ................ 21

3.9.2.1.2 Warning and caution legend ligbtb ................ 21

1+
3.9.2.1.3 Advfeory Ie@nd lights .......................... 21

3.9.2.2 segmented-character dkplays . . . . . . . . . . . . . ... . . . . . . 21

3.9.2 .3 Counters ........................................ 21

3. 9.2.4 Printers ........................................ 21

3.9.3 Dtscrete-slgnkl indicator display characteristics ‘... . . . 22

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1
3.9.3 .lMuMiple-legenda rrays . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 22
I
3.9.3.1.1 Stacked- legend-plab indicators ................... 22
...

3.9.3.1.2 Multiple-legend rear-projection indicators ......... 22

3.9.3.1.3 Visibility ........................................ 22

. 3.9.3.2 Electro-mechanical signal tndicatore (flip-flop ) . . . . . . 22

3.9.3 .2.1 Le@bility . . . . . ..- . . . . . . . . . . . . . . . . . . . ..” . . ...’..”. 22.

3.9.3.2.2 Legends ........................................ 22

22
I 3.9.4 Variable-sigd dteplays .............................

3.9.4. I Scales and gages .................................. 22

I
3.9.4.2 ccmters/Sesmented-cbreder dbk’e ............... 23

3.9.4.2.1 Lett8r width .................................... 23

IQ

3.9.4.2.2 Stroke width .................................... 23

3.9.4.2.3 Multidrum countere .............................. 23

3.9.4.2.4 Rate of change ................................... 23

3.10 Guard characteristics ..................................... 23

I

3..10.1 Protecting toggle ewitches . . . . . . . . . . . . . . . . . . . . ... . . . . . 23

3.10.1.1 channel Suard .. . .. . .. . . . . . .. . .. . . . . . . . . .. . .. . . . . 23

3.10.1.2 Cover guard ................ ......... ........ .... 23

3.10.1.3 Lever 10Cke .. ....... ................. ... ...... .. 23

/,

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3.11.9.1 Ten-digit keyboard . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . ...28

3.11.10 Control sepa@ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

l.,
1. 3.11.11 DIeplay eepamtion ................................. 26

,: ,.
... 3.11.12 Coatrol actuation . . . . . . . . . ... . . . . ... . . . . ... . . . . . . . . . . 28
I
3.11.12.1. Diecrete rotary ee~ectcre (knobs) ...... .... ..... ... 27 .

.3.11 .12.2 l)iscIwt.@ tbumbwheels . .................. .. .. ..... 27

3.11.12.3 Continuous rotary oontrds . . . . . . . . . . . . . . . . . .. . . . . . . 27

3.11.12.4 Contlnuoue tbumbwhe018 . . . . . . ... . . . .. . . . ..... . . . . . . . . 27

3.11.12 .5 TWo-positlont og@eewitchee ........ .......... .. . 27

3.11.12 .6’1’hrae-pOBttiOU tOg@e

3.11.12.7 Puebbutton actt@lon

switches .............. ......

............................
27

28
,e
3.1.1..12.7.1 positive Indtoatfon . . . . . . . . . . . . . . . ... . . . . . . . . . . . . 28

3.11..12.7.2 MuMietation puehbnttona . . . . . . . . . . . . . . . . . . . . ..+. 28

I f 3.11.12.7.3 Interacting pushbutton statiooe ..-..; . . . . . . ... . ... 28

3.11.13 Arran~ment of markln@ . . . . . . . . . . . . . . . . . . . . . .. . . . . 28

3.11.13 .10rlentation . .. . . . . . . . . . . . . . . . . . . . . .. . .. . . . . . . . ... 28

3.11.13 .2 LocMion ....................................... 26

3.11 .13.3 Control position nomenclature arrangement ......... 29

3.12 Coding ................................................... 29

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3.10.2 Protecting pushbuttons . . . . . . . . . . . . . . . . . . . . . . ... . . . . . 24

3.10.2,1 Recesses ........................................ 24

3.10.2.2 Cover guards ................................... 24

! 3.10.2.3

3.10.2.4
Frangible

Interlocks
cover . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . .

......................................
24

24
,

~ “, 3.10.3 Protecting rotary controls .......................... 24

3.10.3.1 Locking detices ................................. 24

I 3.10.3.2 StOPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.10.3 .3 Gate ............................................ 24

I

3.11 Panel layout endarraogement :............................ 24

1“ .s) 3.11.1 Control-display relationsMp ........................ 24

3.11.2 Operator efficiency ................................ 25

3.11.3 Critical primary and emergency controls ............. 25

3.11.4 Clothing considemtions ............................. 25

3.11.5 Direction of movement ............................ 25

,.. .
3.11.6 Panel layout conventions ............................ 25

3.11.7 Panel layout ...................................... 25

3.11.8 Functional grouping arrSnSements ................... 26

3.11.9 Pushbutton array sand wtrices ...................... 26

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3.12.1 Special codfng applications . . . . . . . ... . . . . . . . . . ... . . . . . ““29

4. QUALITY ASSURANCE PROVISICiNS

4.1 Reeponsfbility fo~ inspection . . . . . . . . . . . ... . . ... ... . . . .....*.. . 29

4.2 Iris@@@l Wd teetlpg t~”~m~tS . . . . ... . ... . ... . . . . . . . . . . . .

S. PREPA.RA”TIC)NPm DELIVERY

i 5.1 Prem”rViitkxi,’ paclki@ig, packing’and marking .............. 37

& lwvms

$.1 lsmilasd niM . . . . . . . . . . . . ● ..,..-..,.. . . . . . . . . . . . . . . ... . . . . . . m

.! 6.2 Sp&3fficaticni EiMoreeni6nt Re@Wsk (SEW .................. 37

1;
6.3 Ike&n Mkifww Aeqtme%’(tiq . . . . . . . ... . . . . . . . . . . . . . . ... .

6.4 &e&h5afM EJi3id@oliI%wktbn (SDN) ...................

6.6 Prbwd6iwe of daoimmms . ... . . . . . . . . . . . . . . . . . . . . . ...”..... .9’7

g &%@iis alafmu?ia4‘* -
~
Fvg@61. &si4ftAP%#61L*”6a ,. . . . . . . . . . . . . . .. . . . . . . . . ..4 . . . . . . .

-2. ‘%w~tifkmmldviewfmrwe . . . . . ..4 . .. . . . . . . . . . . . . . . 39

Ff@me 3. @reel Bkdikigs . . . . . . . . . .. . . . . . . . . . . .. . .. . . . . . . . . . . . . . .. . . 40

Figure 4.. Keyboard Arras@meti . . . . . . . . . . . . . . . . . . . . . . .. . ...4.. .. 41

Figure 5. .Control Knob Shapes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 4Z

‘l%ble L Control Salect.ion ‘Chart . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

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Table ~. Control Characteristics .................................. 45

i
Table III. Knob Detents Placement for Visual and Tact&1 Positioning. .. 47 ‘
1
Table IV. Display Selection Chart ................................. 49
#
Table V. Minimum Control Separation Requirement . . ..’...... ...... 50

-. Appendix A. Format For Control Panel Eata . . . . . . . . . . . . . ... . . . . . . . . . 51

Appendix B. Prepariitiori of Marking Plate for Aircmft Control

Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 . . . . . . . . .. . . . ’77

*UA ‘=— Prmm’mG

OF?XX!:
1ST8.,,L-C., ”,,=

:.

91 ,.

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. ----- —
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NOTS: I’%iaform maY not be u=d to mqueat copies of documents, nor to request waivem, d&tion.s, or clarification of
m=ifi-tion -q~~~ on ~nt contmcti. ~m~nh mb~tt~ on tb~ fom do not corutihate or imply authorization
tO wsira any portion of me mfe=nc=l d~mentfd or to amend ~n~t~ ~q~mmen~.
i

‘% (Fold do)u thh Und

(Fc.bi slow thb line)

n
DEPARTMENT OF THE NAVY

111111 NO POSTAGE
N6CESSW+Y
IF MAILEO

UNITED
IN THE
STATES

Bys~NE:sNoREPLYMA~~,
OFFICIAL BuSINESS
PENALTY FOR PRIVATE uSE 83D0

PD=AGE WILL 8E PAID BY THE DEPARTMENT OF THE”NAVY

Commanding Officer
Naval Air Engineering Center
Engineering Specifications h Standards
Department (ESSD) Code 93
Lakehurst, NJ 08733

. —
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,00FlE”6s(slIe*t, cm. 8fam. ZIPC*)

❑ MANUFA CTURER

ln OTMEF!(SLW,WY), -
*1
1
ROBLEM A~EAS

P“wa@N..nW MdWC.rdtIW Y
,;.

b. R O W n m ’IM d O d W M dl” g:

3EMARKS

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tmhu OF StJ8h81TTER ht. .%’s1. M[, — OWond b. WORX T E L EPHONE P4uk46EFi fr.d.* Am

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WAtLtN G A00RE5S(Shwt, C1&.8tie. ZIP C&, -OP,!.nd 8. O ATE OF SU9UlS910N (YYMMDD)

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DDL oR ’1,4 2 6 PREVIOUS EDITION 1s Ogls.a LETE.