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The flight crew uses the temperature selectors on the cockpit’s air conditioning panel to select
the reference temperatures which are fine tuned through the Forward Attendant Panel (FAP) for
the cabin zones. The air conditioning system controllers compute a temperature demand from the
selected temperature and the actual temperature.
The actual temperature is measured by sensors :
‐ In the cockpit, for the cockpit zone ;
‐ In the lavatory extraction circuit and galley ventilation system, for the cabin.
A signal corresponding to the lowest demanded zone temperature goes to the air conditioning
system controllers, which then make both packs produce the required outlet temperature.
OPTIMIZED TEMPERATURE REGULATION
The air conditioning system controllers optimize temperature by acting on the trim air valves.
The temperature selection range is from 18 °C (64 °F) to 30 °C (86 °F).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A318/A319/A320/A321 FLEET DSC-21-10-30 P 4/4
FCOM 19 AUG 10
AIR CONDITIONING SYSTEM CONTROLLERS
Applicable to:
,
,
MSN,,,,
Each air conditioning system controller regulates the temperature of its associated pack, by
modulating the bypass valve and the ram air inlet flap.
The ram air inlet flap closes during takeoff and landing to avoid the ingestion of foreign matter.
Note: During takeoff, the ram air inlet flap closes when takeoff power is set, and the main landing
gear struts are compressed.
During landing, it closes as soon as the main landing gear struts are compressed, as long
as speed is at or above 70 kt.
It opens 20 s after the speed drops below 70 kt.
The air conditioning system controllers also regulate flow by modulating the associated pack flow
control valve.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION
A318/A319/A320/A321 FLEET DSC-21-10-40 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to:
Each controller consists of a primary channel that is normally in control and a secondary channel that
acts as a backup if the primary channel fails.
GENERAL
Applicable to:
,
,
MSN,,,,
Each controller is comprised of two lanes. One lane controls the system, the other takes over full
control, in case of an active lane failure.
ZONE CONTROLLER
Applicable to:
PRIMARY CHANNEL FAILURE
The secondary channel operates as backup.
The flow setting function and optimized temperature regulation are not available. HOT AIR and
TRIM AIR valves close.
The zones are controlled to 24 °C (76 °F) (backup regulation). Pack 1 controls the cockpit
temperature. Pack 2 controls the FWD and AFT cabin temperatures.
ALTN MODE appears on the ECAM (Electronic Centralized Aircraft Monitoring) COND page.
SECONDARY CHANNEL FAILURE
This has no effect on zone temperature regulation.
Backup mode is lost.
PRIMARY AND SECONDARY CHANNEL FAILURE
Optimized and backup temperature regulation is lost.
The packs deliver a fixed temperature : 20 °C (68 °F) for pack 1, 10 °C (50 °F) for pack 2. The
failure removes all information from the ECAM COND page, which then displays PACK REG.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - SYSTEM OPERATION UNDER FAILURE CONDITION
A318/A319/A320/A321 FLEET DSC-21-10-40 P 2/4
FCOM 19 AUG 10
PACK CONTROLLERS
Applicable to:
PRIMARY CHANNEL FAILURE
The secondary computer operates as a backup.
Regulation is not optimized.
Pack flow is fixed at the previous setting.
SECONDARY CHANNEL FAILURE
This failure has no effect on pack regulation. Backup mode is lost.
ECAM signals related to the corresponding pack are lost.
PRIMARY AND SECONDARY CHANNEL FAILURE
As a backup, corresponding pack outlet temperature is controlled by the anti-ice valve and is
stabilized to a temperature between 5 °C (41 °F) and 30 °C (86 °F) in a maximum of 6 min.
ECAM signals, related to the corresponding pack, are lost.
AIR CONDITIONING SYSTEM CONTROLLER
Applicable to:
,
,
MSN,,,,
ONE LANE FAILURE
No effect, as the second lane takes over.
BOTH LANES’ FAILURE
The related pack is lost, and the hot air pressure-regulating valve and associated trim air valves
close.
AIR CYCLE MACHINE FAILURE
　
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