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cabin temperature can be selected from the AIR panel in the cockpit.
A control panel is provided on the forward attendant panel. During cruise, the cabin crew can modify
each cabin zone temperature from the cockpit, with a limited authority of ± 3 °C (5.4 °F).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - GENERAL
A330/A340 FLEET DSC-21-10-10 P 2/4
FCOM 19 AUG 10
Low pressure air is supplied to the mixing unit via a ground connection.
ARCHITECTURE
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - GENERAL
A330/A340 FLEET DSC-21-10-10 P 3/4
FCOM 19 AUG 10
ARCHITECTURE
Applicable to: ,
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - GENERAL
Intentionally left blank
A330/A340 FLEET DSC-21-10-10 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - MAIN COMPONENTS
A330/A340 FLEET DSC-21-10-20 P 1/6
FCOM 19 AUG 10
AIR CONDITIONING PACK
Applicable to: ALL
The two packs operate automatically and independently of each other. Pack operation is controlled
by the pack controller.
Warm pre-conditioned bleed air enters the cooling path via the pack flow control valve and is ducted
to the primary heat exchanger.
Then, the cooled bleed air enters the compressor section of the aircycle machine and is compressed
to a higher pressure and temperature.
It is again cooled in the main heat exchanger, and enters the turbine section where it expands. In
expanding, it generates power to drive the compressor and cooling air fan.
The removal of energy during this process reduces the air temperature, resulting in a very low air
temperature at turbine discharge.
The temperature control valve can modify the pack outlet temperature by adding uncooled air to the
turbine outlet flow.
In case of an air cycle machine failure, a by pass valve allows the bleed air to be cooled by the
corresponding heat exchanger only.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - MAIN COMPONENTS
A330/A340 FLEET DSC-21-10-20 P 2/6
FCOM 19 AUG 10
PACK SCHEMATIC
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - MAIN COMPONENTS
A330/A340 FLEET DSC-21-10-20 P 3/6
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
AIR CONDITIONING - MAIN COMPONENTS
A330/A340 FLEET DSC-21-10-20 P 4/6
FCOM 19 AUG 10
PACK FLOW CONTROL VALVE
Applicable to: ALL
This valve is pneumatically-operated and electrically-controlled. It regulates the air flow in
accordance with signals received from the pack controller.
In the absence of air pressure, a spring keeps the valve closed.
In the absence of electrical supply, the valve is open in a position equivalent to the NORM selection,
provided air supply is available.
The valve closes automatically in case of pack overheating, engine starting, operation of the fire or
ditching pushbuttons, any unclosed doors at engine start, or insufficient upstream pressure. The
valve is controlled from the AIR panel.
RAM AIR
Applicable to: ALL
An emergency ram air inlet ventilates the cockpit and cabin, if both packs fail.
The emergency ram air inlet valve is controlled by the RAM AIR pushbutton on the AIR panel.
This pushbutton opens the ram air valve, provided that ditching is not selected.
The outflow valves open about 50 %, provided that they are under automatic control and ΔP is less
than one psi. They do not automatically open if they are under manual control, even if the ΔP is less
than one PSI. If ΔP is greater than one psi, the check valve, located downstream the ram air door,
will not open. No airflow will then be supplied.
MIXER UNIT
Applicable to: ALL
This unit mixes cold fresh air from the packs with the cabin air being recirculated through
recirculation fans. The mixer unit is also connected to the emergency ram air inlet and the low
pressure ground inlets.
Note: In case both packs are inoperative, the recirculation valves are partially closed.
HOT AIR VALVES
Applicable to: ALL
These valves regulate the pressure of hot air, tapped upstream of the packs.
They are pneumatically-operated and electrically-controlled from the HOT AIR 1 and HOT AIR 2
　
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