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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.
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 2/2
FCOM 19 AUG 10
APU BLEED VALVE OPENING LOGIC
Applicable to: ALL
Note: 1. Leak detection is disregarded during an engine start.
2. APU leak detection is lost, if BMC1 is lost.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - CROSSBLEED
A318/A319/A320/A321 FLEET DSC-36-10-40 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
A crossbleed valve on the crossbleed duct allows the air supply systems of the two engines to be
isolated or interconnected.
On the AIR COND panel, a rotary selector controls the crossbleed valve electrically.
Two electric motors, one for automatic mode and one for manual mode, control the valve.
In automatic mode, the crossbleed valve opens when the system uses APU bleed air. It closes, if the
system detects an air leak (except during engine start).
X-BLEED VALVE CONTROL LOGIC
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - CROSSBLEED
A318/A319/A320/A321 FLEET DSC-36-10-40 P 2/4
FCOM 19 AUG 10
ECAM INDICATION
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - CROSSBLEED
A318/A319/A320/A321 FLEET DSC-36-10-40 P 3/4
FCOM 19 AUG 10
ECAM INDICATION
Applicable to:
,
,
MSN,,,,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - CROSSBLEED
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-36-10-40 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - LEAK DETECTION
A318/A319/A320/A321 FLEET DSC-36-10-50 P 1/2
FCOM 19 AUG 10
LEAK DETECTION
Applicable to: ALL
Leak detection loops detect any overheating near the hot air ducts in the fuselage, pylons, and
wings.
For the pylon and APU, the sensing elements are tied to form a single loop and for the wing, a
double loop.
When the two wing loops detect a leak, or when one loop detects the leak and the other one is
inoperative, they activate a wing leak signal.
BMC1 and BMC2 each contain identical control logic for the system.
‐ A wing leak signal causes :
• the bleed valve on the related side to close automatically
• the associated FAULT light on the AIR COND panel to come on
• the x-bleed valve to close automatically (except during an engine start)
• the APU bleed valve to close automatically (if it is open, and if the leak concerns the left wing)
(except during engine start)
‐ A pylon leak signal causes :
• the bleed valve on the related side to close automatically
• the FAULT light for the related engine on the AIR COND panel to come on
• the x-bleed valve to close automatically (except during an engine start).
‐ An APU leak signal causes :
• the APU bleed valve to close automatically (except during engine start).
• the FAULT light the APU BLEED pushbutton switch on the AIR COND panel to come on
• the x-bleed valve to close automatically (except during an engine start).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - LEAK DETECTION
A318/A319/A320/A321 FLEET DSC-36-10-50 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - OPERATION FOLLOWING FAILURES
A318/A319/A320/A321 FLEET DSC-36-10-60 P 1/2
FCOM 19 AUG 10
BMC FAILURE
Applicable to: ALL
If one BMC fails, the adjacent BMC takes over the monitoring of the bleed system to issue the
following ECAM warnings if necessary :
‐ overpressure
‐ overtemperature
‐ wing leak.
Nevertheless, the associated FAULT light on the AIR COND panel is lost, and the associated bleed
valve does not close automatically.
ENG BLEED LEAK warning is lost for the associated engine, as is also the APU BLEED LEAK
warning if BMC1 has failed.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
　
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