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(1) The APU speed is : 99 % if the ambient temperature is below 25 °C.
101 % if the ambient temperature is above 30 °C.
AIR BLEED SYSTEM
Applicable to:
The air bleed system is fully automatic.
The APU speed is always 100 % whatever the air bleed system demand and the ground/flight
configuration are.
AIR BLEED SYSTEM
Applicable to:
,
,
MSN,,,,
The air bleed system is fully automatic.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-49-10-20 P 3/4
FCOM 19 AUG 10
The APU speed is always 100 % except for air conditioning, the APU speed is 99 % if the ambient
temperature is above -18 °C or if ambient temperature is below 35 °C.
CONTROLS
Applicable to: ALL
The flight crew uses the controls on the APU panel for routine shutdown. For emergency shutdown :
the flight crew can push ‐ the APU FIRE handle, or
‐ the ground crew can push the APU SHUT OFF pushbutton on the interphone panel under the
nose fuselage.
GROUND OPERATION SAFETY DEVICES
Applicable to: ALL
The APU may run without cockpit crew supervision when the aircraft is on the ground. In case of fire
in the APU compartment :
‐ APU fire warnings operate in the cockpit.
‐ A horn in the nose gear bay sounds.
‐ The AVAIL light goes out.
‐ The FAULT light in the MASTER SW lights up.
‐ The APU shuts down.
‐ The APU fire extinguisher discharges.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-49-10-20 P 4/4
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 1/14
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to:
(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.
‐ The APU keeps running for a cooling period of 120 s at N 100 % speed.
‐ 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 2/14
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.
Slow start (BAT OFF when aircraft on batteries only)
EGT overtemperature ECB failure
No flame Loss of overspeed protection
Underspeed
(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 = 55 %. 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 %.
OVERHEAD PANEL
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-49-20 P 3/14
FCOM 19 AUG 10
(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
　
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