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At low engine speed, when the pressure and temperature of the IP air are too low, the system bleeds
air from the HP stage and maintains it at 36 ± 4 PSI.
An intermediate pressure check valve downstream of the IP port closes to prevent air from the HP
stage from being circulated to the IP stage.
L3 The HP valve closes automatically
‐ pneumatically
• in case of low upstream pressure
• in case of excessive upstream pressure
‐ electrically :
• when the bleed valve is closed electrically
• in case of overpressure upstream of the HP valve with wing anti-ice off, two packs on and
aircraft altitude above 15 000 ft.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A318/A319/A320/A321 FLEET DSC-36-10-20 P 8/10
FCOM 19 AUG 10
L1ECAM INDICATION
AIR BLEED SELECTION
Applicable to:
MSN,,,
Air is normally bled from the intermediate pressure stage (IP) of engine’s high-pressure (HP)
compressor to minimize fuel penalty.
At low engine speed, when the pressure and temperature of the IP air are too low, the system bleeds
air from the HP stage and maintains it at 36 ± 4 PSI.
An intermediate pressure check valve downstream of the IP port closes to prevent air from the HP
stage from being circulated to the IP stage.
L3 The HP valve closes automatically
‐ pneumatically
• in case of low upstream pressure
• in case of excessive upstream pressure
‐ electrically :
• when the bleed valve is closed electrically
• in case of overpressure upstream of the HP valve with wing anti-ice off, two packs on and
aircraft altitude above 15 000 ft.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A318/A319/A320/A321 FLEET DSC-36-10-20 P 9/10
FCOM 19 AUG 10
L1ECAM INDICATION
PRESSURE REGULATION AND LIMITATION
Applicable to: ALL
The bleed valve, which is downstream of the junction of HP and IP ducting, acts as a shut-off and
pressure regulating valve.
It maintains delivery pressure at 45 ± 5 PSI.
Note: Bleed pressure may fluctuate between 38 and 56 PSI (with a maximum peak to peak
pressure of 16 PSI) particularly at high engine power (takeoff or climb) up to FL 100.
The bleed valve is fully closed :
‐ pneumatically :
• if upstream pressure goes below 8 PSI
• if there is return flow
‐ electrically by means of
• the BLEED pushbutton switch (switched OFF)
• the ENG FIRE pushbutton (pushed)
• the Bleed air Monitoring Computer (BMC) in the following cases :
‐ overtemperature
‐ overpressure
‐ leak
‐ open starter valve
‐ APU bleed being ON.
If pressure regulation fails, the overpressure valve closes when the pressure goes over 85 PSI.
TEMPERATURE REGULATION AND LIMITATION
Applicable to: ALL
A precooler downstream of the bleed valve regulates the temperature of the bleed air.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A318/A319/A320/A321 FLEET DSC-36-10-20 P 10/10
FCOM 19 AUG 10
The precooler is an air-to-air heat exchanger that uses cooling air bleed from the engine fan to
regulate the temperature to approximately 200 °C.
The fan air valve controls fan air flow.
A spring keeps the fan air valve closed in the absence of pressure.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - APU BLEED AIR SUPPLY
A318/A319/A320/A321 FLEET DSC-36-10-30 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to:
,
,
MSN,,,
Air from the APU load compressor is available on ground and in flight.
The APU bleed valve operates as a shut-off valve to control APU bleed air. It is electrically-controlled
and pneumatically operated.
The APU BLEED pushbutton, on the AIR COND panel, controls the APU bleed valve. When the
flight crew selects ON with the pushbutton, APU bleed air supplies the pneumatic system, if the APU
speed is above 95 %. This opens the crossbleed valve and closes the engine bleed automatically.
A check valve near the crossbleed duct protects the APU, when bleed air comes from another
source.
GENERAL
Applicable to:
Air from the APU load compressor is available on ground and in flight.
The APU bleed valve operates as a shut-off valve to control APU bleed air. It is electrically-controlled
and operated by fuel pressure.
The APU BLEED pushbutton, on the AIR COND panel, controls the APU bleed valve. When the
　
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