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Computer (BMC) to decrease the bleed temperature from normal (200 °C) to reduced setting
(150 °C). This reduction is inhibited, if the wing-anti ice is ON.
TEMPERATURE REGULATION
Applicable to: ALL
The zone controller regulates the cabin and cockpit temperature.
BASIC TEMPERATURE REGULATION
The flight crew uses the temperature selectors on the air conditioning panel in the cockpit to select
the reference temperature. The flight attendant adjusts the cabin temperature from the Forward
Attendant Panel (FAP).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A330/A340 FLEET DSC-21-10-30 P 3/4
FCOM 19 AUG 10
The cabin altitude can be automatically corrected to adjust the cabin temperature for passenger
comfort. The correction is done to the master temperature selected in the cockpit to compensate
for the dryness of the air and the coldness of the lining. (The altitude correction can be
programmed, but the basic manufacturer setting is without correction).
The zone controller computes a temperature demand, depending on the selected temperature and
the actual temperature.
The actual temperature is measured by sensors in the :
Cockpit‐
Lavatory extraction circuit and galley ventilation system for the cabin.‐
A signal corresponding to the lowest demanded zone temperature goes to the pack controller,
which then makes both packs produce the required outlet temperature.
OPTIMIZED TEMPERATURE REGULATION
The zone controller optimizes temperature by acting on the trim air valves.
The cockpit crew can select temperatures between the range of 18 °C (64 °F) to30 °C (86 °F).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
Intentionally left blank
A330/A340 FLEET DSC-21-10-30 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION
A330/A340 FLEET DSC-21-10-40 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Each Controller has a Channel 1 (that is normally in control), and a Channel 2 (that acts as a backup,
if Channel 1 fails).
ZONE CONTROLLER
Applicable to: ALL
CHANNEL 1 OR 2 FAILURE
A Channel 1 or 2 failure has no effect on zone temperature regulation.
CHANNELS 1 AND 2 FAILURE
Optimized and backup temperature regulation are lost. The packs deliver a fixed pack outlet
temperature of 20 °C (68 °F). A Channel 1 and 2 failure removes all information from the ECAM
COND page, which then displays “PACK REG”. Flow selection from the PACK FLOW selector is
lost.
PACK CONTROLLERS
Applicable to: ALL
CHANNEL 1 OR 2 FAILURE
A Channel 1 or 2 failure has no effect on pack regulation.
CHANNELS 1 AND 2 FAILURE
The corresponding anti-ice valve regulates the pack outlet temperature between approximately
1 °C and 15 °C (respectively 34 and 59 °F). The ECAM signals, associated with the corresponding
pack, are lost. The flow control valve pneumatically regulates the pack flow to approximately
120 % of the NORM flow.
AIR CYCLE MACHINE FAILURE
Applicable to: ALL
If the Air Cycle Machine (ACM) fails (compressor/turbine seizure), the affected pack may be operated
in the heat-exchanger cooling mode. Warm pre-conditioned bleed air enters the cooling path, via the
pack flow control valve, and goes to the primary heat exchanger. Then, the compressor check valve
and the bypass valve open, and air is cooled only by the heat exchanger. The ACM seizure reduces
the pack flow.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION
A330/A340 FLEET DSC-21-10-40 P 2/2
FCOM 19 AUG 10
As in normal pack operation :
Th‐e pack controller regulates temperature, in accordance with zone controller demand, by
modulating the temperature control valve and the ram air inlet and outlet flaps.
The zone controller regulates the flow of hot air, through the trim air valves, to opt‐imize
cockpit/cabin temperature regulation. Hot air flow is less in normal pack operation, because the
pack flow is reduced.
Note: A pack with a seized ACM must be switched off on ground, due to the unavailability of RAM
air cooling.
HOT AIR VALVES FAILURE
Applicable to: ALL
One or both valves failed
open
: No effect.
One valve failed closed : No effect (HOT AIR X valve opens)
　
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