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on the ECAM display.
OFF : Manual shutdown sequence.
The ON light on the MASTER SW pushbutton, ‐ and the AVAIL light on the
START pushbutton, go off.
‐ If the aircraft was using APU bleed air, the APU keeps running at 75 % for a
cooling period of 60 to 120 s.
‐ At 7 %, the air inlet flap closes.
FAULT lt : This amber light comes on, and a caution appears on the ECAM, when an
automatic APU shutdown occurs, which happens in case of :
Fire (on ground only) Low oil pressure
Air inlet flap not open High oil temperature
Overspeed DC power loss.
No acceleration (BAT OFF when aircraft on batteries only)
Slow start Overcurrent
EGT overtemperature Sensor failure
No flame IGV failure
Reverse flow ECB failure
(2) START pushbutton switch
ON : Blue ON light comes on.
‐ When the flap is completely open, the APU starter is energized.
‐ When N = 7 %, the ignition is turned ON.
‐ When N = 50 %, the APU starter is de-energized.
‐ When N = 95 %, the ignition is turned off and the ON light on the START
pushbutton goes out.
The APU may now supply bleed air and electrical power to the aircraft
systems.
‐ 15 s later, the APU page disappears from the ECAM display.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-49-20 P 4/14
FCOM 19 AUG 10
AVAIL lt : This green light comes on when N reaches 95 %.
OVERHEAD PANEL
Applicable to:
,
,
MSN,,,
(1) MASTER SW pushbutton
This switch controls the electric power supply for APU operation, and its protective features. It
also controls the starting and shutdown sequences.
ON : The blue ON light comes on.
Electric power goes to the APU system ; the ECB performs a power-up test.
The APU air intake flap opens.
The APU fuel isolation valve opens.
If no fuel tank pump is running, the APU fuel pump operates.
If the aircraft has ground power or main generator power, the APU page appears
on the ECAM display.
OFF : Manual shutdown sequence.
‐ The ON light on the MASTER SW pushbutton, and the AVAIL light on the
START pushbutton, go off.
‐ If the aircraft was using APU bleed air, the APU keeps running for a cooling
period of 60 s.
‐ At 7 %, the air inlet flap closes.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-49-20 P 5/14
FCOM 19 AUG 10
FAULT lt : This amber light comes on, and a caution appears on the ECAM, when an
automatic APU shutdown occurs, which happens in case of :
Fire (on ground only) Reverse flow
Air inlet flap not open Low oil pressure
Overspeed High oil temperature
No acceleration DC power loss.
No speed (BAT OFF when aircraft on batteries only)
EGT overtemperature ECB failure
No flame Loss of overspeed protection
Underspeed Oil system shutdown
Inlet overheat
Clogged oil filter
Loss of EGT thermocouples
(2) START pushbutton switch
ON : Blue ON light comes on.
When the flap is completely open, ‐ the APU starter is energized.
‐ 1.5 s after the starter is energized, the ignition is turned ON.
‐ When N = 60 %. The APU starter is de-energized. The ignition is turned off.
‐ 2 s after N reached 95 %, or when N is above 99.5 % :
The ON light on the START pushbutton goes out.
The APU may now supply bleed air and electrical power to the aircraft
systems.
‐ 10 s later, the APU page disappears from the ECAM display.
AVAIL lt : This green light comes on when N is above 99.5 % or 2 s after N reaches 95 %.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-49-20 P 6/14
FCOM 19 AUG 10
EXTERNAL CONTROLS
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-49-20 P 7/14
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-49-20 P 8/14
FCOM 19 AUG 10
ECAM APU PAGE
Applicable to:
(1) AVAIL
Displayed in green when APU N is above 95 %.
(2) APU bleed air valve position
Inline - Green : The APU bleed air valve is not closed.
Crossline - Green : The APU bleed air valve is closed.
Crossline - Amber : The APU bleed air valve is closed and the APU bleed is ON.
XX - Amber : The APU bleed air valve status information is not available, or the
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 4(84)
