Pneumatic system operation is controlled and monitored by two Bleed Monitoring Computers (BMC
1 and 2), the overhead control panel and the ECAM. The APU bleed supply is controlled by the APU
Electronic Control Box (ECB).
A leak detection system is provided to detect any overheat in the vicinity of the hot air ducts.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 1/8
FCOM 19 AUG 10
GENERAL
Applicable to:
Engine bleed systems are similar.
Each system is designed to :
Select ‐ the air source compressor stage,
‐ Regulate bleed air pressure,
‐ Regulate bleed air temperature.
Each system is controlled and monitored by one Bleed Monitoring Computer (BMC)
Each BMC has bleed pressure, temperature, and valve position information, and is interconnected
to :
‐ Other systems involved with the bleed system,
‐ The other BMCs,
and provides indications and warnings to the ECAM and CMC.
In case one BMC channel fails, the other channel takes over all of the monitoring functions.
The LH and RH bleed valves are electrically-controlled by BMC1 and BMC2 respectively, and are
pneumatically -operated.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 2/8
FCOM 19 AUG 10
L3 (*) Engine 3 and 4 bleed valves close, when the APU bleed valve opens, only if the crossbleed
valve is open.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 3/8
FCOM 19 AUG 10
GENERAL
Applicable to: ,
Engine bleed systems are similar.
Each system is designed to :
Select ‐ the air source compressor stage,
‐ Regulate bleed air pressure,
‐ Regulate bleed air temperature.
Each system is controlled and monitored by one Bleed Monitoring Computer (BMC)
Each BMC has bleed pressure, temperature, and valve position information, and is interconnected
to :
‐ Other systems involved with the bleed system,
‐ The other BMC,
and provides indications and warnings to the ECAM and CMC.
In case of failure of one BMC, the other one takes over most of the monitoring functions.
The LH and RH bleed valves are electrically-controlled by BMC1 and BMC2 respectively, and are
pneumatically -operated.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 4/8
FCOM 19 AUG 10
L3 (*) Engine 2 bleed valves closes, when the APU bleed valve opens, only if the crossbleed valve is
open.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 5/8
FCOM 19 AUG 10
ENGINE AIR SUPPLY
Applicable to:
Air is normally bled from the intermediate pressure stage (IP) of engine HP compressor, to minimize
fuel penalty.
When pressure from the IP is not sufficient (low engine speed), air is bled from the high pressure
(HP) stage thru the HP valve which limits downstream pressure to 36 ± 4 PSI.
An intermediate pressure check valve, mounted downstream of the IP port , closes to prevent air
from HP stage being circulated to the IP stage.
L3 The HP valve is automatically closed
‐ pneumatically :
• in case of low upstream pressure
• in case of excessive upstream pressure
‐ electrically when :
• the BLEED valve is electrically controlled closed or,
• wing anti-ice is OFF and upstream HP valve pressure is > 73 PSI
L1ECAM INDICATION
ENGINE AIR SUPPLY
Applicable to: ,
Air is normally bled from the intermediate pressure stage (IP) of engine HP compressor, to minimize
fuel penalty.
When pressure from IP is not sufficient (low engine speed), air is bled from the high pressure (HP)
stage thru the HP valve which limits downstream pressure to 40 ± 4 PSI .
Two intermediate pressure check valves, mounted downstream of each IP port, close to prevent air
from HP stage being circulated to the IP stage.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - ENGINE BLEED SYSTEM
A330/A340 FLEET DSC-36-10-20 P 6/8
FCOM 19 AUG 10
ECAM INDICATION
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).
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