Training Manual Table of Contents

A318/A319/A320/A321 EASA Part 66 Cat. B1

25 Equipment / Furnishings
25-00 General

25-10 Cockpit Seats

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Captain and First Officer Seats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Seat Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Third Occupant Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

25-23 Linings and Furnishings

Overhead Stowage Compartments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ceiling Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Passenger Service Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sidewall Panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
A321Doors 2/3 Area Heating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

25-50 Cargo Loading System

Semi Automatic Cargo Loading - General . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ball Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Roller Tracks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power Drive Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Door Sill Latches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
XZ–Single Latch 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Additional A319 Informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

25-Study Questions

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Contents - I
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 Training Manual Table of Contents
A318/A319/A320/A321 EASA Part 66 Cat. B1

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Contents - II
Copyright by SR Technics
 Training Manual Equipment and Furnishing
A318/A319/A320/A321 25-00 General

25 Equipment / Furnishings
25-00 General
Figure 1: Passenger Cabin Layout

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Figure 2: Arrangement of Accessory Compartments

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Figure 3: Arrangement for Avionics Compartments

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Figure 4: Avionics Compartments - Component Location

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A318/A319/A320/A321 25-10 Cockpit Seats

25-10 Cockpit Seats

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A318/A319/A320/A321 25-10 Cockpit Seats

General
The cockpit is equipped with three seats a Captain seat, a First Officer seat and a
Third Occupant seat located against the right aft panel.
Figure 1: Component Location

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Figure 2: Cockpit Seats - Component Location Figure 3: Pilot Seat - Manual Control

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A318/A319/A320/A321 25-10 Cockpit Seats

Captain and First Officer Seats A knob located on the front of the armrest ensures height adjustment by means
of a screw-nut system and associated stop (continuous adjustment from 15
General Layout deg. downwards to 10 deg. upwards).
The Captain and First Officer seats are symmetrical and their operation is identi- • Sidestick armrest
cal. They are secured to the cockpit floor. The sidestick armrest located on the outboard side of the seats is provided with
The seat moves longitudinally and vertically. In the rear most position the seat two adjustment knobs. These knobs are used to adjust the height and the tilt
moves sidewise towards the console, which increases the space between the angle of the sidestick armrest so that the pilot can rest his arm in its optimum
pedestal and the seat and therefore enables passage of the seat occupant. This position with respect to the sidestick controller.
is the seat stowed position. The armrest is fixed to the seat pan structure and is not affected by backrest
movements. It can be folded back to a vertical position to enable easy access
Controls to the crew briefcase or console.
• Manual controls are fitted on the seats. They serve to unlock the seat and allow The sidestick armrest is composed of three main sections. These are the fixed
to position it in different configurations. arm, the carrier arm and the sidestick table.
• Electrical controls are also available. They consist of a motor coupled to two The fixed arm supports the carrier arm and sidestick table assembly and is at-
reduction gears. The motor is controlled by two three-position switches. The tached to the seat pan.
gear motor assembly is overriden by the manual controls.
A position indicator including two scales is integrated in the table.
• Additional manual controls are used to adjust the backrest and lumbar rest po-
sition. All the controls are of easy access and enable the occupant to select the The scale on the seat side shows the tilt angle adjustment of the table. The scale
desired position. on the outboard side shows table height.
A wheel, located on the front of the table, serves to avoid interference between the
Electrical Control armrest and the lateral console when the seat is moved forwards with the table
The three-position switch controls the gear motor connected to a rack and pinion fully inclined.
system located under the seat pan. When the seat reaches its limit position, over-
torque is detected and the motor power supply is cut off. The detector is integrated Seat Equipment
in the gear motor.
The backrest incorporates a life vest fitted in a housing.
The gear motor assembly locks the seat on the rack.
A lumbar rest adjustable vertically and horizontally enables adaptation of the seat
Backrest Adjustment to the occupant.
The position of the backrest can be adjusted from 7 deg. to 34 deg. with respect The safety harness comprises five straps and an inertia reel. The inertia reel can
to the vertical by pulling the control handle marked R, located on the pedestal side be locked by a control lever located behind the seat on the right side.
of the seat. The lever acts on two locks by means of a control and 2 cables. A gas
cylinder damps the backwards movement of the backrest and acts as return spring
when backrest is raised to the 7 deg. position.

Armrest Adjustment
• Inboard armrest
The inboard armrest (pedestal side) can be raised vertically and stowed behind
the backrest.

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Figure 4: Pilot Seat (Rear View)

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A318/A319/A320/A321 25-10 Cockpit Seats

Third Occupant Seat To fold down the headrest, simultaneously act on the two controls located in cent-
er of bottom section of the headrest. When the system unlocks, fold down the
The 3rd Occupant seat is a folding seat attached to the right rear panel in the cock- headrest into its stowed position.
pit.
To return the seat assembly to its stowed position, move the control-handle
It can slide along the Y-axis to take up a position on the aircraft centerline. No lon- marked “SEAT UNLOCK” upwards and move the seat into stowed position.
gitudinal adjustment is provided.
Seat pan opens and locks only in the normal operating position in the aircraft cen-
terline.

Controls
A manual control enables the seat to be moved from its stowage position to its uti-
lization position on the aircraft centerline.
A second control serves to unlock the headrest.
A third control serves to lock the inertia reel.

Seat Equipment
The non-adjustable armrests pivot on the seat uprights.
The headrest can be folded down so that the circuit breaker panel can be opened
while the seat is in its stowed position.
A compartment closed by VELCRO tapes and containing a life vest is provided in
the lower part of the seat.
The safety harness includes fifth straps and an inertia reel controlled by a handle
located on the left of the seat. This handle serves to lock and unlock the inertia
reel.

Operation
Deployment from stowage position to utilization position on aircraft centerline.
To move the seat to its utilization position on the aircraft centerline, the handle
called “SEAT UNLOCK”, located on the left of the seat, must be pulled upwards in
order to unlock the system and enable the seat to slide transversally into its utili-
zation position. When utilization position is reached, the system locks.
The translation movement is given by two guide tubes attached to the rear upper
and lower sections of the seat. The tubes are guided by ball-sleeves attached to
the rear panel. The seat is held in position by a locking pin which engages in the
upper guide tube.
To raise the seat bottom, push seat upwards to override the locking force, the seat
and the two armrests will then rise automatically.

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Figure 5: Third Occupant Seat

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Figure 6: Pilot Seat - Electrical Control

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25-23 Linings and Furnishings

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Overhead Stowage Compartments Figure 1: Panels

The overhead stowage compartments (OHSC) have a box structure and are of dif-
ferent lengths:
Each OHSC has:
• one or more doors with a handle/latch assembly for each door,
• a handgrip along its length,
• hinge mechanisms that attach the door to the OHSC,
• a gas filled damper strut on each hinge mechanism (spacer OHSC only on one
hinge) for a controlled door operation,
• upper attachment brackets,
• lower attachment brackets.
• mounting rails for the installation of the passenger service/information unit
(PSUI) and the emergency oxygen container.
Brackets connect the OHSC to each other.
Brackets and turnbuckles attach the OHSC to the fuselage structure.
Cabin temperature control sensors are installed between the OHSC according to
the cabin layout.

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Figure 2: Overhead Stowage Compartment Figure 3: New Overhead Stowage Compartment

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Ceiling Panels Figure 4: Ceiling Panels

The ceiling panels are made of synthetic honeycomb material. They are installed
along the full length of the cabin and the utility area.

Cabin Area
The ceiling panels in the cabin area are installed between the left and the right
overhead stowage compartments and have flourescent lamps. The ballast units
are part of the lamp units and are attached to the ceiling panels. Filler strips are
installed in the area between the panels. The ceiling panels are attached to the
overhead stowage compartments with attachment rails and latches.
Open the left and right overhead compartment doors below the ceiling panel.
Open the access doors in the left and right overhead stowage compartments.
Disconnect the electrical connectors left and right at the access doors.
Put blanking caps on the disconnected electrical connectors.
Close the overhead stowage compartment doors.
Open the two quick release fasteners at the left side of the ceiling panel.
Push the left side of the ceiling panel up.
Move the ceiling panel to the left and out of the spring fasteners.
Move the ceiling panel at an angle with the right side down.
Make sure the right side of the ceiling panel is clear from the overhead stowage
compartments.
Remove the ceiling panel.

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Passenger Service Units Figure 5: Passenger Service/Information

Each PSU has:
• an attendant call panel (Ref. 23-73-00),
• a reading light panel (Ref. 33-25-00),
• a fresh air outlet panel (Ref. 21-24-00),
• an emergency oxygen mask container (Ref. 35-20-00).

Attendant Call Panel

Each Panel has:
• an attendant call/reset push button,
• reading light ON/OFF switches,
• lighted seat numbers and seat row number,
• lighted SMOKER/NO SMOKER sign.

Reading Light Panel

The number of reading lights on each reading light panel agrees with the customer
seat layout. Each reading light is adjustable and can be switched ON or OFF in-
dependently with its related switch. The Reading light switches are located on the
attendant call panel.

Fresh Air Outlet Panel

The number of fresh air outlets on each fresh air outlet panel agrees with the cus-
tomer seat layout. Each fresh air outlet is adjustable and can be opened or closed
independently.

Emergency Oxygen Mask Container

The number of emergency oxygen masks in each container agrees with the cus-
tomer seat layout. The oxygen masks fall from the container immediately, if there
is a sudden decrease in cabin pressure.
Passenger Information Units (PIUs) (Ref. 23-73-00)
Each PIU is a single panel which has:
• a loudspeaker,
• a lighted sign FASTEN SEAT BELT,
• a lighted sign NO SMOKING.
The PIUs are installed only above every second seat row.

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Figure 6: Cove Light Panels

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Sidewall Panels Hinges attach them to the upper part of the panels. A silicon rubber locking device
holds each door in the closed position. If a rapid decompression occurs in the cab-
Cove-Light Panel in or cargo compartment the doors will automatically open (Ref. 25-68-00).
(Ref. Fig. 006 SHEET 006.1) Figure 7: Sidewall Panels
The cove-light panels are installed between the overhead stowage compartments
and the upper sidewall panels. They are attached to the attachment rails on the
overhead stowage compartments with assembly seals. The bracket of the panels
are engaged in fittings, behind the upper edges of the upper sidewall panels.

Upper Sidewall Panels

(Ref. Fig. 007 SHEET 007.1)
The upper sidewall panels are made of synthetic honeycomb material.They have
moulded plastic window frames. The panels are installed on special attachment
fittings called YO-YO-Rollers. There are different types of panels e.g. with or with-
out a window, 2-frame panels.
Some of the panels have different equipment installed in them e.g. emergency exit
markers, electrical sockets.

Lower Sidewall Panels

(Ref. Fig. 008 SHEET 008.1)
The lower sidewall panels have two parts:
• The decorative panels
• The metallic base panels.
The metallic base panels and the decorative panels make a channel for the cabin
air conditioning supply. Self-adhesive sound-insulation foam is installed in the
channel.

Decorative Panels
The decorative panels are made of NOMEX honeycomb material with pre-impreg-
nated phenolic fiberglass. Decorative foil or fabric make the cover of the front sur-
face. Fasteners attach the upper part of the decorative panels to the attachment
fittings mounted on the fuselage structure. Screws attach the bottom part of the
decorative panel to the metallic base panel.

Metallic Base Panels

Quick release pins attach the lower part of the metallic base panels to the cabin
floor structure. Decompression doors are installed in the metallic base panels.

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A321Doors 2/3 Area Heating System Components

The heated floor panels increase the temperature of the floor in some areas to The heated floor panel has:
give more comfort to the crew and the passengers. • A heating foil which is protected with an aluminium outer cover plate
A/C A321 (276-299, 476-499, 503-549) • Insulation material to keep the temperature of the heating foil
• Drain holes to drain fluid
Heated Floor Panels • A sensor to measure the temperature of the heating foil
General • One overtemperature thermostat
The heated floor panels increase the temperature in areas of the cabin which are • One self-locking overtemperature thermostat.
much colder than other areas in the cabin.
Operation
System Architecture If a control unit has a malfunction and supplies constant power to a heated floor
The heated floor panel system has: panel, the overtemperature thermostat operates.
• Heated floor panels The overtemperature thermostat operates at approximately 35 deg.C (95.00
• Control units. deg.F) and 65 deg.C (149.00 deg.F).
If the heated floor panel temperature increases more than 80 deg.C (176.00
Description deg.F) the self-locking overtemperature thermostat will stop the power supply to
The heated floor panel system operates when: the heated floor panel.
• The circuit brakers of the system are closed.
Figure 8: Heated Floor PanelDoor 2/3
• The galley supply system operates (Ref. 24-56-00).
The heated floor panels:
• Have sensors which measure constantly the temperature of the panels.
• Are connected to the control units.
• Give data of the measured temperature to the control units.
The control units:
• Supplies electrical power to the heated floor panels if the temperature is less
than a given temperature.
• Removes the electrical power supply from the heated floor panels if the tem-
perature is more than a given temperature.

Heated Floor Panel

General
The heated floor panel is made of composite material. It has heating element(s) to
heat the surface of the panel.

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Figure 9: Heater Box Figure 10: Schematic

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25-50 Cargo Loading System

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A318/A319/A320/A321 25-50 Cargo Loading System

Semi Automatic Cargo Loading - General Loading Area Lights

(A321 shown, A320/A319 is similar) The loading area lights are spotlights installed in the ceiling panels at the FWD and
AFT cargo compartment doors. The intensity of the lights of the loading area per-
In the lower deck of the aircraft, there are two lower holds (FWD hold and AFT mits you to read labels on loading equipment near a cargo compartment door. The
hold) which are divided into cargo compartments. The FWD hold is divided into the toggle switch for the loading area lights is installed at the FWD and AFT door op-
FWD cargo compartments No. 1 and No. 2. The AFT hold is divided into the AFT
eration panel.
cargo compartments No. 3, No. 4 and the Bulk cargo compartment No. 5. A divider
net isolates the cargo compartment No. 5 from the cargo compartments No. 3 and Drainage of FWD and AFT Cargo Compartments
No.4.
The FWD and AFT cargo compartments have drainage systems which operate in
The FWD and AFT cargo compartments each have an equivalent semi-automatic an equivalent manner. Each drainage system has filters, filter holders, drain fun-
cargo loading system. Cargo which is to be loaded may be in containers, on pal- nels, flexible hoses and pipes. The drainage system collects and lets rain-water
lets or loaded in bulk. Containers and pallets can be loaded in the FWD and AFT and spilt liquids flow out of the cargo compartments.
cargo compartment only.
Two hydraulically operated cargo compartment doors which open to the outside
are installed on the lower right side of the aircraft.
The Bulk cargo compartment is in Zone 160 between FR59 and FR65. A manually
operated door (Bulk door) which opens to the inside is installed on the lower right
side of the aircraft.
The Bulk cargo compartment has tiedown/attachment points for the door nets and
for the nets and straps which keep the bulk cargo in place.

Linings and Floor Panels

The linings and floor panels in the FWD and AFT lower holds prevent damage to
the aircraft structure. The linings are made of flame-resistant synthetic material
and permit fast decompression. The floor panels are of sandwich construction and
have non-slip surfaces.

Rapid Decompression Panels

Rapid decompression panels (blow-in and blow-out) are part of the cargo com-
partment linings. They are installed in the cutouts of the ceiling panels and lateral
right sidewall lining at FR52A and FR56.
Catch assemblies hold them in the cutouts. The rapid decompression panels are
sealed to the ceiling panels and to the sidewall lining with adhesive tape.

Cargo Compartment Lighting

Each lower hold has a lighting system with fluorescent lamps which are installed
in the center of the cargo compartment ceiling. Toggle switches installed at the
doors of the cargo compartments control the lighting system.

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Figure 1: Cargo Compartments A321 - A320

A320 A321

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Figure 2: Cargo Compartments A319 - A318

A319 A318

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Figure 3: FWD Cargo Compartment (A321 shown, A319/A320 similar but

shorter)

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Figure 4: AFT Cargo Compartment (A321 shown, A319/A320 similar but

shorter)

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Ball Mats Figure 5: Ball Mats and Ball Unit

The ball mats are installed across the full width of the cargo compartment floor.
The ball strips are installed between the door sill latches. The ball mats and ball
strips make it possible to move a ULD in the longitudinal and lateral direction. The
ball mats and ball strips have an aluminum structure and hold the ball unit assem-
blies.

Ball Unit
Each ball unit has a ball installed in a bearing shell. This shell is contained in a
circular housing. A top cover holds the ball and bearing shell in the housing. The
top cover is also a dirt shield. The top cover has 2 spring struts for installation.

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Roller Tracks Figure 6: Rollers

The roller tracks are on the centerline of the cargo compartment floor. Installed in
the roller tracks are transport rollers. The roller tracks permit ULD to move in the
longitudinal direction.

Transport Roller
Each transport roller assembly has a roller and 2 bearings installed on a shaft. A
washer and a cotter pin on each end of the shaft safety the roller assembly to the
roller track.

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Control Panel the UP position. The actuator is then in operation and compresses a spring in the
mechanism. The spring makes the overrideable Y–latch move to the lifted position
The control panels for the FWD and AFT semi–automatic cargo loading systems when the ULD is moved away.
(FWD and AFT systems) are on the cargo compartment doors. They are installed
at the forward edge on the inner face of each cargo compartment door. The control ULD = Unit Loading Device
panels are the control panel 2020VU1 for the FWD system and the control panel PDU = Power Drive Unit
2020VU2 for the AFT system.
On each control panel there are:
• one POWER ON/OFF switch 5MY,
• one Joystick 4MY,
• one DOOR SILL LATCH switch 6MY,
• one POWER indicator light 7MY.
The POWER ON/OFF switch 5MY is a toggle switch. The four–position joystick
4MY goes back to the center/neutral position automatically. The joystick controls
the operation of the PDU. The joystick is gated to permit the manual selection of
one operation at a time.
The four positions available are:
• IN – the lateral PDU operates in the load direction,
• OUT – the lateral PDU operates in the unload direction,
• FWD – the longitudinal PDU operate in the flight direction,
• AFT – the longitudinal PDU operate against the flight direction.

Operation
When the POWER ON/OFF switch is set to ON, power is supplied to the system
when the YZ–latches of the door sill latches are lowered. This operates the limit
switches (2004VU1, 2004VU2 for the FWD system and 2004VU3, 2004VU4 for
the AFT system).
When you put the POWER ON/OFF switch to the ON position, the power contac-
tor in the control box closes, and AC and DC power is supplied to the system. The
control box has a monitor circuit which controls the power to the POWER light
7MY. The POWER light comes on when the power supply is correct. The DOOR
SILL LATCH switch 6MY is a toggle switch. An internal spring keeps it in the UP
position. The DOOR SILL LATCH switch 6MY operates the overrideable Y–latch
of the door sill latch. To lower the overrideable Y–latch, put the DOOR SILL
LATCH switch to the DOWN position and hold it there. This causes the actuator
20MY for the FWD system to operate and Lower the overrideable Y–Latch. For
the AFT system it is the actuator 120MY. You can release the DOOR SILL LATCH
switch 6MY when the ULD is above the overrideable Y–latch. It then goes back to

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Figure 7: Control Panel (Typical for all Cargo Compartments)

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A318/A319/A320/A321 25-50 Cargo Loading System

Control Box Figure 8: CLS Sontrol Box Location

The control boxes 1MY and 10MY are installed behind the sidewall panels of the
FWD and AFT cargo compartments. The control box 1MY is between
STA1163(FR28) and STA1217(FR29) in the FWD cargo compartment. The con-
trol box 10MY is between STA2349(FR51) and STA2403(FR52) in the AFT cargo
compartment.

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Power Drive Units

The power drive units (PDU) are installed in the FWD and AFT cargo compart-
ments. The PDU for longitudinal movement of the ULD are in the roller tracks. For
the lateral movement there is a single PDU on the right side of each cargo com-
partment in the ball mat area.
The PDU to move the ULD in the lateral direction in the FWD cargo compartment
is between FR26 and FR27. In the AFT compartment the PDU is between FR54
and FR54A. Each PDU has an aluminum housing with an electrical motor, a gear
train and a rubber covered roller. The motor is a three phase squirrel cage motor
with a thermal overload protection. The motor operates with 115/200 V AC,
400 Hz. When the PDU is energized, the drive roller is lifted until it touches the un-
derside of the ULD. When the PDU is deenergized, the roller stops and is lowered
to the cargo compartment floor level. When the PDU operates in the opposite di-
rection the supply phases are changed and make the gears operate in the oppo-
site direction.

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Figure 9: Power Drive Unit (PDU) (A320 has 3+4 PDUs)

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Door Sill Latches the electric motor of the actuator starts to turn and lowers the Y–latch through an
actuating mechanism.
General If an electrical malfunction occurs, you can lower the Y–latch manually. To lower
Two door sill latches are installed in the FWD and AFT cargo compartments. The the Y–latch manually, operate the manual door–sill latch lever which is installed
latches are installed on the door sills of each cargo compartment. In the FWD car- between the door sill latches.
go compartment they are at FR26 and FR27. In the AFT cargo compartment they
are installed between FR53 and FR54 and at FR55. XZ–Single Latch 32
Each door sill latch has: The manually operated XZ–single latches 32 are in the FWD and AFT cargo com-
• a housing, partments. The XZ–single latches 32 are installed in the roller tracks which are on
• a manually operated YZ–latch, the centerline of the cargo compartment floor. The XZ–single latches 32 can lock
• an overridable Y–latch, one or two ULD (two when the ULD are placed back to back). They hold ULD with
a base plate size of 60.4 x 61.5 in. in the X and Z directions. The XZ–single latch
• a guide–in roller, 32 have latching elements which lock and secure ULD in their related positions.
• a limit switch. The latching elements can lock and secure one or two ULD (two when the ULD
The functions of the door sill latches are: are placed back to back). A yellow marked safety indicator is located on the sur-
• to prevent the accidental roll–out of a ULD, face of the locking element, this shows if the latch is in the fully locked or unlocked
condition. When the latch is in the fully locked position you can not see the yellow
• to lock a ULD in position,
indicator.
• to hold the ULD vertical with the guide–in roller.
Proximity Switch
Manually operated YZ–Latch
A proximity switch is below each XZ–single latch 32. The proximity switches are
The manually operated YZ–latch locks the ULD in the door area in position. When wired in series with the PDUs. Thus power is only available at the PDU when the
the YZ–latch is lifted, a spring pushes on a pawl which locks the YZ–latch in posi- latches are lowered. See Figure 10 on page 15
tion. When you push the release lever on the side of the door sill latch down, the
pawl disengages and permits a spring to lower the YZ–latch manually until the End Stops
pawl locks it in position. When the YZ–latch moves, it operates a limit switch.
The end stops are in the roller tracks installed on the center line of the cargo com-
Limit Switch partment floor in the FWD and AFT cargo compartments. They have the shape of
fixed XZ–single latches and hold the ULD in the X and Z directions.
The limit switch supplies an electrical two way lock. It prevents the operation of the
cargo compartment door when the YZ–latch is in the lowered position. The limit
switch also electrically isolates the cargo loading system when the YZ–latch is in
the lifted position. (Figure 10 on page 15)

Overridable Y–Latch
A ULD can move over the Y–latch, but only in the load direction. The ULD pushes
the Y–latch down. A spring lifts the Y–latch again when the ULD is moved away.
Thus the latch prevents the accidental roll–out of a ULD. To unload a ULD you
must lower the Y–latch. To lower the Y–latch electrically, you operate the SILL
LATCH switch on the control panel. When you operate the SILL LATCH switch,

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Figure 10: Proximity Switch on Latch Locations

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Figure 11: Sill Latch Actuator (Typical for all Cargo Compartments)

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Figure 12: Sill - Latch Manual Operation

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Figure 13: Door Still Latches

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Figure 14: Electrical Schematic - FWD Cargo Compartment

A321 is shown
A320: 4 PDUs,
2 PROX.SWs ONLY

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Figure 15: Electrical Schematic - AFT Cargo Compartment

A321 is shown
A320: 4 PDUs,
3 PROX.SWs ONLY

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Additional A319 Informations

Figure 16: Cargo Capacity of A319 Compared with A320

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Figure 17: Cargo Loading

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Figure 18: Door Sill Roller - A319 AFT Cargo Compartment Figure 19: Entrance Guide - A319 AFT Cargo Compartment

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 Training Manual Study Questions
A318/A319/A320/A321 Equipment - Furnishing

25-Study Questions
25-10 Cockpit Seats 25-50 Cargo Loading System
1. How can the cockpit seats be operated? 3. When is the cargo loading system energized?

2. Where is the location of the CB,s for the cockpit seats? 4. How are the PDU’s energized?

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 Training Manual Study Questions
A318/A319/A320/A321 Equipment - Furnishing

5. The cargo loading control box being supplied, which latch ensures the ener-
gization of the PDU,s.

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