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Delivery pressure is regulated between 38 and 48 PSI , depending on the flow and is modulated to
balance the flow bled from the two engines located on the same wing.
The pressure can be reduced, in case of over temperature at the precooler inlet.
In case of pressure regulation failure, the overpressure valve (OPV) closes, when the pressure is
greater than 85 PSI.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 7/8
FCOM 19 AUG 10
The bleed valve is fully closed :
‐ Pneumatically in case of :
• Upstream pressure less than 8 PSI, or
• return flow
• Engine fire (thermal fuse)
‐ Electrically through the:
• BLEED pushbutton, when switched OFF
• ENG FIRE pushbutton (of related or adjacent engine) when pushed
• BMC, in the following cases :
‐ Overtemperature
‐ Overpressure
‐ Leak detection
‐ APU bleed ON (for RH engines, provided crossbleed valve is not closed).
‐ Starting sequence
PRESSURE REGULATION AND LIMITATION
Applicable to: ,
Downstream of the junction of HP and IP ducting, air is admitted into the bleed valve. This bleed
valve acts as a shut-off, and as a Pressure Regulating Valve (PRV).
Delivery pressure is regulated between 44 and 52 PSI , depending on the flow.
The pressure can be reduced, in case of over temperature at the precooler inlet.
In case of pressure regulation failure, the overpressure valve (OPV) closes, when the pressure is
greater than 85 PSI.
The bleed valve is fully closed :
‐ Pneumatically in case of :
• Upstream pressure less than 8 PSI, or
• Engine fire (thermal fuse)
‐ Electrically through the:
• BLEED pushbutton, when switched OFF
• ENG FIRE pushbutton when pushed
• BMC, in the following cases :
‐ Overtemperature
‐ Overpressure
‐ Leak detection
‐ APU bleed ON (for Engine 2, provided crossbleed valve is not closed).
‐ Starting sequence
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 8/8
FCOM 19 AUG 10
TEMPERATURE REGULATION AND LIMITATION
Applicable to: ALL
The temperature regulation of bleed air is achieved by a precooler, that is mounted downstream of
the bleed valve.
The precooler is an air-to-air heat exchanger, which uses cooling air that is bled from the engine Fan,
to regulate the temperature to 200 °C.
Fan airflow is controlled by the Fan Air Valve.
When wing anti-ice is selected off, the temperature may be regulated to 150 °C, upon zone controller
demand.
The fan air valve is spring-loaded closed, in the absence of pressure.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - APU BLEED AIR SUPPLY
A330/A340 FLEET DSC-36-10-30 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
Air supplied by the APU load compressor is both available on ground and in flight.
APU bleed air is controlled by the APU bleed valve, which operates as shutoff valve. It is
electrically-controlled and pneumatically -operated.
The APU bleed valve is controlled by the APU BLEED pushbutton, located on the AIR panel.
When, the pushbutton is set to ON, APU bleed air supplies the pneumatic system, provided APU N is
greater than > 95 %. This causes the crossbleed valve to open and the engine bleed valves to close.
A non-return valve, located near the crossbleed duct, protects the APU when air is bled from another
supply source.
APU BLEED VALVE OPENING LOGIC
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - APU BLEED AIR SUPPLY
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A330/A340 FLEET DSC-36-10-30 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - HP GROUND AIR SUPPLY
A330/A340 FLEET DSC-36-10-40 P 1/2
FCOM 19 AUG 10
HP GROUND AIR SUPPLY
Applicable to: ALL
Air is supplied to the aircraft’s pneumatic system via two HP ground connectors. The crossbleed
valve has to be opened manually opened to provide air for both sides.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - HP GROUND AIR SUPPLY
Intentionally left blank
A330/A340 FLEET DSC-36-10-40 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - CROSSBLEED
A330/A340 FLEET DSC-36-10-50 P 1/4
　
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