50 Cargo and Accessory Compartments

A350
TECHNICAL TRAINING MANUAL

MAINTENANCE COURSE - T1+T2 - RR Trent XWB
Cargo and Accessory Compartments
This document must be used for training purposes only
Under no circumstances should this document be used as a reference
It will not be updated.
All rights reserved

No part of this manual may be reproduced in any form,
by photostat, microfilm, retrieval system, or any other means,
without the prior written permission of AIRBUS S.A.S.
AIRBUS Environmental Recommendation

Please consider your environmental responsability before printing this document.
A350 TECHNICAL TRAINING MANUAL
CARGO AND ACCESSORY COMPARTMENTS

Cargo Compartments Panels Description (2/3) . . . . . . . . . . . . . . . . . . 2
Cargo Loading System Description (2/3) . . . . . . . . . . . . . . . . . . . . . . 12
Cargo Drainage System Description (2/3) . . . . . . . . . . . . . . . . . . . . . 26
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MAINTENANCE COURSE - T1+T2 - RR Trent XWB TABLE OF CONTENTS Jun 30, 2014
50 - Cargo and Accessory Compartments Page 1
CARGO COMPARTMENTS PANELS DESCRIPTION (2/3)

Introduction
The Lower Deck Cargo Compartments (LDCC) are defined by physical
boundaries consisting of:
- Vertical/inclined sidewall lining panels and partition walls (door panels,
decompression protection devices)
- Ceiling panels
- Floor panels
- Additional access panels are installed for maintenance access to
components installed behind the linings.
The basic function of these panels and walls are:
- To protect surrounding structures/systems against temperature and
handling loads
- To seal the LDCC adequately to make a fully air tight compartment for
fire containment and fire extinguishing purpose.
The design principle of sidewall, rapid decompression panels, partition
and ceiling linings is a composite sandwich construction (Glass Fiber
Reinforced Plastic (GFRP) fabrics with a honeycomb core).
The design of the floor panels is a composite sandwich construction
(Carbon Fiber Reinforced Plastic (CFRP) fabrics with a honeycomb core).
The LDCC lining and floor panels are attached to the structure with quick
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release fasteners.
The panels are sealed, as this is necessary to guarantee a sufficient
concentration of fire extinguishing agent after discharge for the safe
continuation of the flight.
MAINTENANCE COURSE - T1+T2 - RR Trent XWB CARGO COMPARTMENTS PANELS DESCRIPTION (2/3) Jul 10, 2014
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INTRODUCTION

FWD Cargo Compartment
Vertical and inclined sidewall lining panels make the left and right limits
of the cargo compartments. Partition walls make the FWD and aft limits,
the ceiling panels the upper limit and floor panels the lower limit.
The FWD partition wall of the FWD cargo compartment is equipped with
an access door to the main avionics compartment.
On the inclined sidewall lining panels, footsteps are installed providing
an aisle when pallets are loaded.
Rapid decompression panels (blow-in and blow-out) are installed on the
vertical lining of the cargo compartments.
To avoid damage to the cargo compartment lining caused by pressure
difference during climb and descent flight phases, pressure compensation
valves ensure pressure equalization between cabin and LDCCs.
There is one pressure compensation valve assembly installed per LDCC.
Each assembly is composed of two spring-loaded relief valves that cover
both blow-in and blow-out cases. If required, each valve may be pushed
by air pressure in the opening direction against a spring. To protect the
valve from damages which might occur during cargo loading, a protection
grid is installed over the valve body (cargo compartment side only).
Direct access from either side of the partition walls is given for valves
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visual inspection.
The cargo compartments ceiling consists of several collapsing panels
which are attached to the fuselage primary structure and secondary
structure with quick release fasteners. They protect the structure against
rapid decompression damages. In case of high pressure difference, the
collapsing ceiling panels will open together with the decompression
panels installed in the sidewall lining.
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FWD CARGO COMPARTMENT

Aft and Bulk Cargo Compartments
The aft LDCC lining panels and associated equipments are similar to the
FWD LDCC ones, however there are some differences:
- Aft partition wall in the bulk cargo compartment is equipped with an
access door to the rear part of the fuselage (maintenance access only)
- There is one pressure compensation valve assembly installed on the
bulk compartment maintenance access door (aft partition wall of the aft
cargo compartment)
- Rapid decompression panels installed in the bulk cargo compartment
are equipped with a protection panel.
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AFT AND BULK CARGO COMPARTMENTS

Rapid Decompression Panels D/O
Rapid decompression panels (blow-in and blow-out) are installed on the
sidewall panels and on the fixed partition walls of the cargo compartments.
In case of decompression in the cabin (blow-out case), or in the cargo
compartment (blow-in case), they equalize the pressure in both sections,
to avoid damage to the A/C structure.
The panels have a composite structure (made of a honeycomb core and
a flame-retardant laminated-skin). Foam-tape makes a seal between the
panel and the frame. The panel assemblies include a panel, a frame and
fastener assemblies. The fastener assemblies are attached to the frames
and include some latches, springs and catches. Those installed in the
sensitive cargo handling areas are equipped with a protection grid or a
protection panel.
If a rapid-decompression occurs in the cargo compartment, the cabin
higher air pressure pushes the panel assemblies against their fasteners.
This force will release the catches and the panel assemblies are blown
inboard (blow-in). The higher air pressure can flow from the cabin to the
cargo compartment.
If a rapid-decompression occurs in the cabin, the LDCC higher air
pressure pushes the panel against their fasteners. This force will release
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the catches and the panels are blown outboard (blow-out). The higher air
pressure can flow from the cargo compartment to the cabin.
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RAPID DECOMPRESSION PANELS D/O

Lining Panels and Fasteners
All lining panels are installed with quick-release fasteners into the A/C
structure. As per regulations, all fasteners in the cargo compartments
have no loose parts (only captive parts).
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LINING PANELS AND FASTENERS
CARGO LOADING SYSTEM DESCRIPTION (2/3)

The lateral guides are installed in the ball mat area of the FWD cargo
Components compartment to make the loading and unloading procedure easier.
The lockable center latches are installed in the center roller track.
Transport and Guiding
They hold the half-size ULDs in the transversal and vertical directions.
The FWD and the aft cargo compartments each have a lower deck
CLS that operates independently when the A/C is on ground. Each
CLS moves, holds and locks the ULDs on the A/C.
The ULDs are locked and unlocked manually.
The PDUs are the primary components of the CLS.
The PDUs move the ULDs in longitudinal and transversal directions
(ball mat area only).
Each PDU detects the presence of an ULD through a built-in optical
sensor.
Two types of PDUs are installed:
- The self erecting PDU (only installed in the ball mat area)
- The spring loaded PDU (installed in the longitudinal area).
When the self erecting PDU is in operation, two rollers touch the
bottom of the ULD. The rollers turn and move the ULD.
The spring loaded PDU has two rollers to move the ULDs and a spring
that holds the rollers against the bottom of the ULD. The rollers drive
the ULDs but they can also operate as a brake if the PDUs are not in
operation.
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Seven roller tracks are installed longitudinally across the FWD and
aft cargo compartments. The roller tracks have transport rollers for a
proper movement of the ULDs.
The ball mat assemblies are installed in the cargo door area. They
have ball transfer units that allow multi-directional movement of the
ULDs.
The entrance guides are installed at the door area to guide the ULDs
in the transversal and longitudinal directions, and prevent damages
to A/C structure.
The splitter guides move the half-size ULDs into the right or left side
of the cargo compartment.
MAINTENANCE COURSE - T1+T2 - RR Trent XWB CARGO LOADING SYSTEM DESCRIPTION (2/3) Jul 10, 2014
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COMPONENTS - TRANSPORT AND GUIDING

Components (continued)
Latching
Different types of latches hold and guide the ULDs in the X, Y and
Z directions.
These types of latches are installed:
- XZ latch
- Lockable center latches
- YZ latch
- Door sill latch.
The XZ latches are installed in the roller tracks and hold the ULDs
in the X and Z directions.
The XZ latches are manually operated.
The lockable center latches hold the half-size ULDs in the Y and Z
directions. The lockable center latches are manually operated and
overrideable. The lockable center latches retracts when a full-size
ULD moves above it.
The YZ latches:
- Guide the ULDs during loading and unloading
- Hold the ULDs in the Y and Z directions (fixed latches)
- Make sure that no ULD can hit the compartment lining.
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The door sill latches are installed on the door sill in the door area. The
door sill latches hold the ULDs in the Y and Z directions. During
loading and unloading operations the door sill latches are retracted to
make the ULD movement possible.
The proximity switches are installed at the XZ latches, lockable center
latches, and in the door sill latches. The proximity switches monitor
the position of the latches.
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COMPONENTS - LATCHING

Door Sill Latch
Each door-sill latch unit has:
- A door sill latch
- A door-sill anti-roll-out device
- A door sill roller.
The door-sill latch unit is multifunctional:
- The basic component has a retractable door sill latch that holds the
ULD in the Y and Z directions during flight
- The anti roll out device stops the ULD to go back out of the cargo
compartment during loading procedure and split function
- The door sill roller operate as a load carrier for the ULDs.
Five door-sill latch units are installed in the FWD compartment door
area and five door-sill latch units are installed in the aft cargo
compartment door area.
The door sill latch can be manually operated. When the lowering lever
is pushed down, the door-sill latch pawl lowers. To raise the door-sill
latch pawl in locked position the pawl must be lifted up manually.
Two of the five door sill latches in the FWD cargo compartment have
proximity switches. Also two of the five door sill latches in the aft
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cargo compartment have proximity switches. Those proximity switches

are installed in the door-sill latch unit base. They detect the position
of the door sill latches to inhibit cargo door closure, should one door
sill latch be detected in the retracted position. The CLS is only supplied
with electrical power when all door sill latches are lowered.
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COMPONENTS - DOOR SILL LATCH

to resume electrical cargo loading, both joysticks first have to be
Components (continued) returned to their zero position.
When the ULD is in position, the latches must be manually locked.
Control Panels and Cargo Control Box
Manual loading:
There is one cargo control box for each of the FWD and aft cargo For the manual loading, the SYSTEM ON/OFF SW must be in the
compartments. The cargo control box receives commands from the OFF position. Then you can manually move the ULD in position and
outside control panel and the inside control panel. must lock the latches manually.
The cargo control box controls and monitors directly the PDUs that
are installed in the ball mat area and the longitudinal area of PDUs.
The outside control panel is the primary command interface for the
operation of the electrical CLS.
The outside control panel has:
- A SYSTEM ON/OFF SW
- A joystick that gives the commands IN/OUT/FWD/AFT/SPLIT
- A SYSTEM READY green lamp
- A LAMP TEST P/B.
The inside control panel is the secondary command interface for the
operation of the CLS. The joystick of the inside control panel only
gives the aft and the FWD commands.
One single person can operate the CLS in two different modes:
- The electrical loading that is semi-automatic (ULD displacement is
motorized, but ULD locking is manual)
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- The manual loading that is fully manual.

Semi-automatic electrical CLS:
When the SYSTEM ON/OFF SW is set to ON the SYSTEM READY
lamp starts to flash. The flashes stop after some seconds and the light
of the SYSTEM READY becomes steady ON. This shows that the
electrical CLS system is now ready to operate.
One person can move the ULD through the joystick of the outside
control panel or the inside control panel (only used for the longitudinal
area).
Note that simultaneous actions on the outside control panel and the
inside control panel will cause a complete stop of PDUs operation;
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COMPONENTS - CONTROL PANELS AND CARGO CONTROL BOX

Door-Sill Proximity Switch
The door sill latches are connected independently to the cargo control
box. If all the door sill latches are in the DOWN (lowered) position,
the CLS is energized thru the CCB.
If all the door sill latches are in the UP (locked) position, the CLS is
electrically isolated.
When the position of one door sill latch is different from the other
ones, the CLS operation is electrically isolated.
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COMPONENTS - DOOR-SILL PROXIMITY SWITCH

Conveyance Proximity Switches
The conveyance proximity switches are installed below the XZ latches,
lockable center latches and detect if the latches are in the lift or
lowered position.
If the latch is in the lifted position, the proximity switch sends a signal
to the related PDU that will signal the cargo control box to cut-off the
power supply to the PDU. As a result, all PDUs after a raised latch in
load direction are inactive to drive ULDs.
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COMPONENTS - CONVEYANCE PROXIMITY SWITCHES

Cargo Control Box Interfaces
The cargo control box receives signals from the proximity switches
that are installed below the door sill latches through discrete wires.
Those proximity switches monitor the status of the door sill latches.
The cargo control box receives discrete signals from the inside control
panel and the outside control panel. The cargo control box operates
the SYSTEM READY lamp of the outside control panel that shows
if the CLS is prepared for operation. The CLS starts to operate if there
is no inhibition.
The cargo control box receives feedback from the proximity switches
that are installed below the XZ and lockable center latches through a
CAN data bus. The cargo control box then sends commands to the
transverse and longitudinal PDUs through a CAN data bus.
These LRUs of the CLS have an internal BITE:
- The cargo control boxes (monitoring of the cargo control box itself,
the inside and outside control panels, the door sill latches, and the
PDUs)
- The PDUs (monitoring of the PDU itself, and the proximity switches
of XZ latches and lockable center latches).
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The LRUs send the internal failure data to the cargo control box
through the CAN data bus and the discrete wires. The failure messages
are stored in the cargo control box BITE memory. The cargo control
box sends the messages to the CMS.
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COMPONENTS - CARGO CONTROL BOX INTERFACES
CARGO DRAINAGE SYSTEM DESCRIPTION (2/3)

Introduction
The A/C has three Lower Deck Cargo Compartments (LDCCs) equipped
with a drainage system. They are:
- The FWD cargo compartment
- The aft cargo compartment
- The bulk cargo compartment.
A gravity-based drainage system collects all fluids spilled in the cargo
compartments, and drains them into the bilge (standard unheated bilge
drainage system) or to the drain masts (heated drainage system option).
It operates both on ground (overboard evacuation) and in flight (but no
overboard evacuation, except if heated drainage option installed).
The purpose of the drainage system is to prevent:
- Accumulation of fluids and ice in the cargo compartments or in the
bilge
- Contamination of the A/C structure (corrosion prevention) and the
systems which are installed above and below of the LDCCs floor.
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MAINTENANCE COURSE - T1+T2 - RR Trent XWB CARGO DRAINAGE SYSTEM DESCRIPTION (2/3) Jul 10, 2014
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INTRODUCTION

Implementation
Fluid Collection Zones at Cargo Compartments FloorLevel
The components of the drainage system which are installed at floor
level in the LDCCs, collect the fluids spilled in the compartment.
These fluids are then routed to a cross-connecting pipe system installed
below the floor.
The components of the drainage system installed at the floor level
are:
- Drain funnels fitted with filters installed in the roller tracks: center
area and at the ends of each track
- Overflow holes in the roller tracks side walls
- FWD LDCC drainage pan (rear end) and aft LDCC drainage pan
(front end) are installed to drain the cargo compartment floor panels;
fluids are collected via filters
- Ball mat area: the PDU drain pans with funnels below each self
erecting PDU
- Ball mat area: the ball transfer units fitted with filter cages and the
filters that drain the fluids into drain pans (with funnels) installed
below the ball mat.
Note that spring loaded PDUs installed in the longitudinal area are
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not equipped with drain pans: fluids flowing in the roller tracks by-pass
them underneath.
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IMPLEMENTATION - FLUID COLLECTION ZONES AT CARGO COMPARTMENTS FLOORLEVEL

Implementation (continued)
Fluid Collection Components at Cargo Compartments Floor
Level
The components in charge of fluids collection at the cargo
compartments floor level are illustrated on this slide. The FWD cargo
compartment is shown, and the aft cargo compartment is identical.
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IMPLEMENTATION - FLUID COLLECTION COMPONENTS AT CARGO COMPARTMENTS FLOOR LEVEL

Fluid Collection Under Cargo Compartments Floor
(Unheated System)
The standard drainage system is an unheated bilge drainage system.
The fluids collected at the cargo compartments floor level will be led
into the bilge via a pipe system. The fluids, which are collected in the
bilge, drain out of the A/C via bilge drain valves.
The bilge drain valves, installed at the bottom of the fuselage panels,
are used for the evacuation of fluids overboard. The drain valves are
spring loaded open on ground (or close to the ground), and will be
closed by the cabin differential pressure in flight. Therefore no fluid
can flow out of the A/C unless the cabin differential pressure drops
below a set value.
As said above none of these drainage components are heated, therefore
ice accumulation in the A/C belly is possible in flight.
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IMPLEMENTATION - FLUID COLLECTION UNDER CARGO COMPARTMENTS FLOOR (UNHEATED SYSTEM)

Fluid Collection Under Cargo Compartments Floor
(Optional Heated System)
The optional drainage system is heated.
The fluids which are collected at the cargo compartments floor level
will be led to the ATA 38 FWD or aft heated drain masts via a heated
piping system.
The pipes, the cargo drain valves, and the drain masts are equipped
with heater elements and insulation, to prevent freezing of fluids inside
the drainage system, on ground and in flight under cold weather
conditions.
The cargo drain valve is installed within the cargo drain piping system
upstream of the drain mast. The valve functions automatically,
depending on the level of water in the piping. If no water (or other
fluids) are to be drained out, the valve will remain closed. If water
accumulates in the drain piping, the hydrostatic pressure of the water
column will force the valve to the open position and the water will be
released overboard.
This design of the valve prevents pressurization losses from the
fuselage.
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The drain valve is equipped with a manual lift facility to enable

draining if the valve interior is blocked.
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IMPLEMENTATION - FLUID COLLECTION UNDER CARGO COMPARTMENTS FLOOR (OPTIONAL HEATED SYSTEM)
AIRBUS S.A.S.
31707 BLAGNAC cedex, FRANCE
STM
REFERENCE V2414251
JUNE 2014
PRINTED IN FRANCE
AIRBUS S.A.S. 2014
ALL RIGHTS RESERVED
AN EADS COMPANY

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A350

TECHNICAL TRAINING MANUAL

Under no circumstances should this document be used as a reference

It will not be updated.

All rights reserved

AIRBUS Environmental Recommendation

CARGO AND ACCESSORY COMPARTMENTS

CARGO COMPARTMENTS PANELS DESCRIPTION (2/3)

CARGO COMPARTMENTS PANELS DESCRIPTION (2/3)

FWD CARGO COMPARTMENT

CARGO COMPARTMENTS PANELS DESCRIPTION (2/3)

AFT AND BULK CARGO COMPARTMENTS

CARGO COMPARTMENTS PANELS DESCRIPTION (2/3)

RAPID DECOMPRESSION PANELS D/O

CARGO COMPARTMENTS PANELS DESCRIPTION (2/3)

LINING PANELS AND FASTENERS

CARGO LOADING SYSTEM DESCRIPTION (2/3)

COMPONENTS - TRANSPORT AND GUIDING

CARGO LOADING SYSTEM DESCRIPTION (2/3)

CARGO LOADING SYSTEM DESCRIPTION (2/3)

cargo compartment have proximity switches. Those proximity switches

COMPONENTS - DOOR SILL LATCH

CARGO LOADING SYSTEM DESCRIPTION (2/3)

- The manual loading that is fully manual.

COMPONENTS - CONTROL PANELS AND CARGO CONTROL BOX

CARGO LOADING SYSTEM DESCRIPTION (2/3)

COMPONENTS - DOOR-SILL PROXIMITY SWITCH

CARGO LOADING SYSTEM DESCRIPTION (2/3)

COMPONENTS - CONVEYANCE PROXIMITY SWITCHES

CARGO LOADING SYSTEM DESCRIPTION (2/3)

COMPONENTS - CARGO CONTROL BOX INTERFACES

CARGO DRAINAGE SYSTEM DESCRIPTION (2/3)

CARGO DRAINAGE SYSTEM DESCRIPTION (2/3)

IMPLEMENTATION - FLUID COLLECTION ZONES AT CARGO COMPARTMENTS FLOORLEVEL

CARGO DRAINAGE SYSTEM DESCRIPTION (2/3)

IMPLEMENTATION - FLUID COLLECTION COMPONENTS AT CARGO COMPARTMENTS FLOOR LEVEL

CARGO DRAINAGE SYSTEM DESCRIPTION (2/3)

IMPLEMENTATION - FLUID COLLECTION UNDER CARGO COMPARTMENTS FLOOR (UNHEATED SYSTEM)

CARGO DRAINAGE SYSTEM DESCRIPTION (2/3)

The drain valve is equipped with a manual lift facility to enable

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