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PNEUMATIC
DESCRIPTION - OPERATION FOLLOWING FAILURES
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A318/A319/A320/A321 FLEET DSC-36-10-60 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-36-20 P 1/8
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
(1) ENG 1 and ENG 2 BLEED pb sw
On : Bleed valve opens if :
Upstream ‐ pressure is above 8 PSI.
‐ APU BLEED pushbutton switch is off or APU bleed valve is closed.
‐ There is no onside wing or pylon leak, and no overpressure or
overtemperature has been detected.
‐ The ENG FIRE pushbutton has not been popped out.
‐ The engine start valve is closed.
FAULT lt : This amber light comes on, and an ECAM caution appears, if :
‐ There is an overpressure downstream of the bleed valve.
‐ There is a bleed air overheat.
‐ There is a wing or engine leak on the related side.
‐ The bleed valve is not closed during engine start.
‐ The bleed valve is not closed with APU bleed ON.
lt goes out when the ENG BLEED pushbutton switch is OFF if the fault has
disappeared.
OFF : The bleed valve and HP valve close. The white OFF light comes on.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-36-20 P 2/8
FCOM 19 AUG 10
(2) APU BLEED pb sw
ON : The APU valve opens if N > 95 % and there is no leak in the APU or in the left
side bleed. (If there is a leak on the right side, the x-bleed valve closes.)
The blue ON light comes on.
Off : The APU valve closes.
FAULT
light
: This amber light comes on, and an ECAM caution appears, when the system
detects an APU leak.
(3) X-BLEED selector sw
AUTO : The crossbleed valve is open if the APU bleed valve is open.
The crossbleed valve is closed if the APU bleed valve is closed or, in case of a
wing, pylon, or APU leak (except during engine start).
OPEN : The crossbleed valve is open.
CLOSE : The crossbleed valve is closed.
ECAM BLEED PAGE
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-36-20 P 3/8
FCOM 19 AUG 10
(1) HP VALVES
Crossline - Green : HP valve normally fully closed
In line - Green : HP valve not fully closed
Crossline - Amber : HP valve not in commanded (closed) position
(2) ENGINE BLEED VALVES
Crossline - Green : BLEED valve normally open
In line - Green : BLEED valve normally fully closed
Crossline - Amber : BLEED valve not in commanded (open) position
In line - Amber : BLEED valve not in commanded (closed) position
(3) ENGINE BLEED INDICATIONS
(A) Precooler inlet pressure
It is normally in green.
It becomes amber, if under 4 PSI, or if overpressure is detected by the BMC (threshold
between 57 and 60 PSI).
(B) Precooler outlet temperature
It is normally in green.
It becomes amber, if the BMC detects an overheat or low temperature.
Overheat : Temperature exceeds :
‐ 290 °C for more than 5 s, or
‐ 270 °C for more than 15 s, or
‐ 257 °C for more than 55 s
Low temperature is detected, if the temperature is lower than 150 °C.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
PNEUMATIC
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-36-20 P 4/8
FCOM 19 AUG 10
Note: When the engines are at idle, and depending on the ambient temperature, the
precooler outlet temperature may be below 150 °C (displayed amber).
(4) APU BLEED VALVE
Crossline - Green : The APU valve is not fully open, and the APU master switch is ON.
In line - Green : The APU valve is fully open, and the APU master switch is ON.
Crossline - Amber : The APU valve is fully closed, the APU master switch is ON, and the
APU bleed switch is ON for more than 10 s.
(5) CROSSBLEED VALVE
Crossline - Green : The crossbleed valve is normally closed.
In line - Green : The crossbleed valve is normally open.
Crossline - Amber : The crossbleed valve is not in the commanded (closed) position.
In line - Amber : The crossbleed valve is not in the commanded (open) position.
Transit - Amber : The crossbleed valve is in transit.
(6) GND HP ground connection indication
: On ground, it is displayed in green.
(7) ANTI ICE indication
It is displayed in white, when the WING pushbutton on the ANTI-ICE panel is ON.
(8) Arrow
: It is normally not displayed, when the ‐ corresponding valve is closed.
　
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