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AIR BLEED SYSTEM
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.
CONTROLS
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
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.
CCM ALL
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┃I  +-~ A318                     ┃             APU        ┃1.49.20     P 1       ┃
┃  .*,,.8, ,, ~% A319            ┃                        ┃                      ┃
┃                                ┃                        ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃                        ┃SEQ 100 J ┃J REV 23  ┃
┃      A+~7-~'iP" A321           ┃CONTROLS AND INDICATORS ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                        ┃          ┃          ┃
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     MASTER SW pb sw
 APU
RASTER Sl~
This switch controls the electric power supply for the operation of the APU 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 switch and the AVAIL light
                on the START pushbutton go out.
             - The APU keeps running for a cooling period of 120 seconds at N 100 %
                speed.
FAULT It
- At 7 % the air inlet flap closes.
This amber light comes on, and a caution appears on ECAM, when an
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual5(52)