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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - AVIONICS VENTILATION
A330/A340 FLEET DSC-21-30-20 P 4/6
FCOM 19 AUG 10
SCHEMATICS
Applicable to: ,
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - AVIONICS VENTILATION
A330/A340 FLEET DSC-21-30-20 P 5/6
FCOM 19 AUG 10
SYSTEM OPERATION
Applicable to:
The cabin and the extract fans operate continuously. Air, recirculated from the cabin, is provided to
the avionics compartment and the flight deck instrument panels.
Note: In case of failure of two cabin fans, fresh air is blown from the packs.
In normal operation, fresh air is blown by the extract fan :
On ground, engines not running : Through the OVBD extract valve (the underfloor extract valve is‐
closed).
In f‐light, or on ground, with inner engines running : Through the underfloor extract valve (the
OVBD extract valve is closed).
If OVRD is selected on the EXTRACT pushbutton, air is blown through the OVBD extract valve which
is partially open (the underfloor extract valve is closed).
When the DITCHING pushbutton is ON, the OVBD extract valve is closed and the underfloor extract
valve is open, whatever the position of the EXTRACT pushbutton.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - AVIONICS VENTILATION
A330/A340 FLEET DSC-21-30-20 P 6/6
FCOM 19 AUG 10
SYSTEM OPERATION
Applicable to: ,
The cabin and the extract fans operate continuously. Air, recirculated from the cabin, is provided to
the avionics compartment and the flight deck instrument panels.
Note: In case of failure of two cabin fans, fresh air is blown from the packs.
In normal operation, fresh air is blown by the extract fan :
On ground, engines not running : Through the OVBD extract valve (the underfloor extract valve is‐
closed).
In flight, or on ground, with engines running : Through the underfloor extract valve (the OVBD‐
extract valve is closed).
If OVRD is selected on the EXTRACT pushbutton, air is blown through the OVBD extract valve which
is partially open (the underfloor extract valve is closed).
When the DITCHING pushbutton is ON, the OVBD extract valve is closed and the underfloor extract
valve is open, whatever the position of the EXTRACT pushbutton.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - BATTERY VENTILATION
A330/A340 FLEET DSC-21-30-40 P 1/2
FCOM 19 AUG 10
BATTERY VENTILATION
Applicable to: ALL
A venturi in the aircraft skin draws air from the space around the batteries and vents it overboard.
The resulting airflow ventilates the batteries.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - BATTERY VENTILATION
Intentionally left blank
A330/A340 FLEET DSC-21-30-40 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - LAVATORY AND GALLEY VENTILATION
A330/A340 FLEET DSC-21-30-50 P 1/2
FCOM 19 AUG 10
LAVATORY AND GALLEY VENTILATION
Applicable to: ALL
The lavatory and galley are ventilated with air from main cabin distribution system.
Air is discharged outside through a venturi. On ground, or when ▵P < 1 PSI, it is extracted by an
electrical fan controlled by the ventilation controller.
Ventilation of the cabin temperature sensors is connected to the extraction duct.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - LAVATORY AND GALLEY VENTILATION
Intentionally left blank
A330/A340 FLEET DSC-21-30-50 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
VENTILATION - PACK BAY VENTILATION
A330/A340 FLEET DSC-21-30-70 P 1/2
FCOM 19 AUG 10
PACK BAY VENTILATION
Applicable to: ALL
Ventilation of the pack bay ensures air circulation in order to maintain, on ground and in flight, a
mean temperature that is compatible with the structure constraints in the relevant area.
In flight, air from the outside flows into the pack bay through a NACA air inlet.
On ground, a turbofan provides sufficient airflow.
The turbofan is driven by air from the bleed system, which is supplied through the turbofan supply
valve. Controlled by the AEVC, the fan operates when the aircraft is on ground.
An ECAM warning, associated with an external horn on ground, is triggered in case of failure of the
　
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