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• The associated ENGINE BLEED FAULT light on the AIR panel are illuminated
• The X-bleed valve automatically closes (except when manually selected open).
• If the APU bleed valve is open, and if the leak affects the left wing, the APU bleed valve
automatically closes.
‐ In case of pylon leak signal
• The bleed valves and the HP valves on the affected side are automatically closed
• The FAULT light associated with the related engine is illuminated on the AIR panel
• The X-bleed valve automatically closes (except during an engine start or manually selected
open).
• If the APU bleed valve is opened, and if the leak affects pylon 1, the APU bleed valve
automatically closes (except during engine start).
‐ In case of APU leak signal
• The APU bleed valve automatically closes
• The FAULT light illuminates on the APU BLEED pushbutton on the AIR panel.
• The X-bleed valve automatically closes (except when manually selected open).
• If the APU bleed valve is closed, the engine 1 bleed valve and engine 1 HP valve automatically
close.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - LEAK DETECTION
A330/A340 FLEET DSC-36-10-60 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - OPERATION FOLLOWING FAILURES
A330/A340 FLEET DSC-36-10-70 P 1/2
FCOM 19 AUG 10
BMC FAILURE
Applicable to:
If one BMC is failed the BMC takes over monitoring of the bleed system and ensures the following
ECAM warnings :
‐ ENG BLEED FAULT (overpressure and overtemperature only)
‐ WING LEAK
‐ BLEED LO TEMP (if wing anti ice is on)
Nevertheless the associated FAULT light on the AIR panel is lost, and the bleed valve does not close
automatically.
ENG BLEED LEAK warning is lost for the associated engine as well as APU BLEED LEAK warning if
BMC2 is concerned.
BMC FAILURE
Applicable to: ,
If one BMC is failed the other BMC takes over monitoring of the bleed system and ensures the
following ECAM warnings :
‐ ENG BLEED FAULT (overpressure and overtemperature only)
‐ WING LEAK
‐ BLEED LO TEMP (if wing anti ice is on)
Nevertheless the associated FAULT light on the AIR panel is lost, and the bleed valve does not close
automatically.
ENG BLEED LEAK warning is lost for the associated engine as well as APU BLEED LEAK warning if
BMC1 is concerned.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
DESCRIPTION - OPERATION FOLLOWING FAILURES
Intentionally left blank
A330/A340 FLEET DSC-36-10-70 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-36-20 P 1/10
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(1) ENG 1 (2, 3 or 4) BLEED pb sw
On : The bleed valve opens, provided :
Upstream ‐ pressure is above 8 PSI.
‐ The APU BLEED pushbutton is OFF, or the APU bleed valve is closed.
‐ There is no onside wing or pylon leak, overpressure or overtemperature
detected.
‐ The ENG FIRE pushbutton is not released out.
‐ The ENG start valve is closed.
FAULT lt : Comes on, along with an associated ECAM caution, in case the :
‐ Bleed valve is not closed during engine start.
‐ Bleed valve is not closed with APU bleed ON (and for RH engine crossbleed
open).
and additionally associated with autoclosure of the bleed and HP valves :
‐ Overpressure downstream of the bleed valve.
‐ Bleed overheat
‐ Wing or engine leak on the related side.
It goes off, when the ENG BLEED pushbutton is OFF, provided the failure has
disappeared.
OFF : The Bleed valve and HP valve close. The OFF light comes on white. The FAULT
light and the autoclosure signal are reset.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-36-20 P 2/10
FCOM 19 AUG 10
(2) APU BLEED pb sw
ON : APU valve opens provided :
‐ N > 95 %
‐ Altitude < 25 000 ft climbing
or < 23 000 ft descending
‐ No leak detected on APU or LH bleed (Should a leak occur on the RH side, the
X-bleed would close).
ON light illuminates blue.
Off : APU valves closes.
FAULT lt : illuminates amber, associated with ECAM caution, when APU leak is detected.
(3) X-BLEED sel
AUTO : X-bleed valve is open if APU bleed valve is open
X-bleed valve is closed if APU bleed valve is closed.
OPEN : X-bleed valve is open.
　
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