A350 Technical Training Manual Maintenance Course Water/Waste System

Technical Training Manual Overview

A350
TECHNICAL TRAINING MANUAL
MAINTENANCE COURSE - T1+T2 - RR Trent XWB
Water/WasteThis 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.
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Please consider your environmental responsability before printing this document.AIRBUS
A350 TECHNICAL TRAINING MANUAL
WATER/WASTE

System Descriptions

Potable Water System Description

Potable Water System Description (2/3)
2

Waste Disposal System Description

Waste Disposal System Description (2/3) .
16

Water and Waste System Control and Indicating

Water and Waste System Control and Indicating (2)
26
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38 - Water/Waste
TABLE OF CONTENTS
Oct 06, 2015
Page 1AIRBUS
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Potable Water System Description (2/3)

General System Philosophy

POTABLE WATER SYSTEM DESCRIPTION (2/3)
General System Philosophy
The Potable Water System (PWS) is based on a centralized system
architecture with components for the water storage, pressurization and
distribution. These components are used for the water cabin consumers:

• Galleys
• Lavatories.

The Human-Machine Interface (HMI) for the servicing/ground handling,
maintenance operations and cabin crew interaction with the PWS is
installed at the stations that follow:

• Potable Water Service Panel (PWSP) and its Potable Water Indication
  Panel (PWIP)
• CIDS/FAP (cabin crew interface), through the PWS function hosted in
  the CIDS.

The PWS control, monitoring and communication use a single system
Controller Area Network (CAN) bus and the distributed logic
(intelligence) of its smart components. The PWS supplies water under
pressure and keeps a hygienically water quality, during the system filling
and during the ground/flight distribution.
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POTABLE WATER SYSTEM DESCRIPTION (2/3)
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CIDS
Pratcal Waste
PWIP
FILLING
% WATER
00
60
40-
PRE
20
C
STATUS
CIDS
DIRECTOR
PWS
1
2
POTABLE WATER STOWAGE AND SUPPLY
WATER PUMP
UV-WATER
TREATMENT MODULE
AIR MANIFOLD
NO STEP NO STEP NO ETEP NO STEP
WATER TANKS
FWD DRAIN
VALVE
FILL/DRAIN
VALVE
BYPASS/DRAIN
VALVE
GENERAL SYSTEM PHILOSOPHY
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POTABLE WATER SYSTEM DESCRIPTION (2/3)
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Page 3
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CABIN CONSUMERS
MAIN SUPPLY WATER LINE
-
-
RECIRCULATION WATER LINE
LAVATORY
GALLEY
PWIP: Potable Water Indication Panel
PWSP: Potable Water Service Panel
PWS:
Potable Water Service
UV:
Ultra-Violet
PWSP
FILL
STOP
DRAIN
·
Fimp
FAP
NO STEP NO STEP NO STEP NO STEPAIRBUS
A350 TECHNICAL TRAINING MANUAL

Potable Water Storage/Supply Description

POTABLE WATER SYSTEM DESCRIPTION (2/3)
Potable Water Storage/Supply Description
Potable-water tank assemblies
Two potable-water tank assemblies are installed side by side in a
horizontal position aft of the bulk cargo compartment.
The potable-water storage capacity of the A/C extends from the
baseline volume of (1060 liters) to an optionally extended volume of
(1500 liters).
Each tank has:

• A recirculation port
• An overflow/vent port
• A water outlet port
• A capacitive dip stick, associated with a Potable-Water Quantity
  Transmitter (PWQT).

The dip stick measures the water level and sends a signal to its related
potable-water quantity transmitter. The transmitter sends the signal
to the PWIP for calculation. The level indication is available on the
FAP and the PWIP.

Potable-water tank pressurization

Potable-water tank pressurization
The potable water tanks are pre-pressurized to (30 - 35 psig), by the
bleed air or by ground supplied compressed air through an air
manifold.
If the PWS is operated without tank pressurization available (e.g. on
ground without a bleed air/ground pressure available), the
pressure-controlled water pump is used as a single pressure source.
If there is a failure of the water pump in flight, the bleed air is used
as a single pressure source to supply the water.

Potable-water treatment module

Potable-water treatment module
The PWS has a water treatment module, to prevent the system
contamination. The water treatment is done by water irradiation with
the Ultra-Violet (UV) lights. The water goes through the water
treatment module before going to the main supply line and to the cabin
consumers.
The water treatment function also prevents the microbiological
contamination during tank refilling. The water tanks are filled via the
fill/drain valve, the water treatment module and the bypass/drain valve.

Fill/drain valve

Fill/drain valve
This valve enables the servicing functions (fill and drain) and performs
the depressurization and overflow protection for the tanks. It is
electrically controlled and monitored by the PWIP. By design, the
PWS servicing on ground (filling and draining) operates with the
electrical power only.
The valve is equipped by a manual override device, accessible directly
at the PWSP. The maintenance personnel use it, as a back-up, if:

• There is a fill/drain valve failure
• The electrical power is not available during servicing.

Bypass/drain valve

Bypass/drain valve
This valve is installed between the water treatment module and the
recirculation ports of the tanks, to bypass the potable water pump,
when it is opened. The bypass/drain valve is used for two reasons:

• During filling operation, to avoid a loss of water-tanker refill
  pressure, flow rate and shorter-system servicing duration
• For full drainage operation of the system piping, by gravity.

It is electrically controlled and monitored by the PWIP.
The valve has a manual lever, to be opened or closed manually if:

• There is a valve failure
• No electrical power is available (manual override).

Maintenance operation is necessary to remove access panel, for this
back-up action. A label shows if the valve is in the open or closed
position.

Door switch

Door switch
The door micro switch detects the service panel door position
(open/not open). The POTABLE WATER SERVICE DOOR OPEN
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message status is indicated on the FAP. This status is known by the
PWIP to perform control logic for the valves.
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POTABLE WATER SYSTEM DESCRIPTION (2/3)
Oct 07, 2015
Page 5AIRBUS
A350 TECHNICAL TRAINING MANUAL
ASSY: Assembly
PWQT: Potable Water Quantity Transmitter
BLEED AIR
AIR MANIFOLD
FLOAT
VALVE
GROUND
PRESSURIZATION
PORT
OVERFLOW PORT
OVERFLOW PORT
PWQT
PWQT
HO STE
NO STEP
RECIRCULATION
PORT
LH
POTABLE-WATER
TANK ASSY
FROM CABIN
CONSUMMERS
RECIRCULATION
PORT
RH
POTABLE-WATER
TANK ASSY
RECIRCULATION
WATER LINE
WATER OUTLET PORT
WATER OUTLET PORT
M
MANUAL
CONTROL LEVER
BYPASS/DRAIN VALVE
POTABLE WATER
TREATMENT MODULE
FILL/DRAIN
VALVE
MANUAL
OVERRIDE
DEVICE
PWSP
A/C SKIN
OVERFLOW NIPPLE
DOOR SWITCH
PWIP
MANUAL
OVERRIDE
FILL/DRAIN
NIPPLE + CAP
POTABLE WATER STORAGE/SUPPLY DESCRIPTION - POTABLE WATER STORAGE PART
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POTABLE WATER SYSTEM DESCRIPTION (2/3)
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.
TO CABIN CONSUMMERS
PL.19
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Potable Water Storage/Supply Description (continued)

POTABLE WATER SYSTEM DESCRIPTION (2/3)
Potable Water Storage/Supply Description (continued)
Potable water pump
The potable water pump operates as a pressure boost pump to increase
the water pressure to (40 psig) (system working pressure) and to make
the water circulation. It is an electrically-driven and pressure-controlled
centrifugal pump.
The potable water pump continuously supplies a water circulation
through the PWS main supply-lines and the recirculation lines.

FWD drain valve

FWD drain valve
The FWD drain valve is used to drain the forward PWS part by gravity.
It is electrically controlled and monitored by the PWIP.
The FWD drain valve has a lever to manually open or close the valve
if:

• There is a valve failure
• No electrical power is available.

A maintenance access removal is necessary for this back-up action.
A label shows if the valve is in the open or closed position.

Cabin consumers: lavatory and galley

Cabin consumers: lavatory and galley
All the cabin consumers are connected to the main water supply line,
which comes from the water tanks.
A water recirculation line is installed from the FWD cabin part back
to the potable water tanks. It creates a closed circuit with a continuous
flow of treated water.
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Cold weather package (optional)

Cold weather package (optional)
The main depress valve is installed on the overflow line between the
tanks and the overflow nipple. This valve is used for the optional
depress mode, selected via the FAP and the WATER DEPRESS key.
This valve bypasses the fill/drain valve, to release air pressure from
the tanks on ground only. The depress mode is an optional PWS
function for the A/C cold weather operation. It allows the transfer of
the water from the wet monuments (lavatories and galleys) into heated
zones of the PWS, to prevent freezing. The system depressurization
is necessary to transfer easily.
The support depress valve is installed between the overflow line and
the recirculation line and used to vent the recirculation line. It creates
easily the full drainage of FWD PWS part.
The last step will be the opening of the FWD drain valve after a fixed
time delay in order to relief outboard the remaining water.

Cabin/cockpit zone humidification (optional)

Cabin/cockpit zone humidification (optional)
A maximum of six humidifier shut-off valves supply water to the
cabin/cockpit zone humidification system (ATA 21 optional).
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