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APU

The APU compartment is ventilated by
APU compressor by-pass air.
Air ducted from the APU intake door that is then exhausted through the eductor
A fan, mechanically driven from the APU gearbox
The APU compartment requieres no ventilation
The primary function of the APU is
To supply bleed air for main engine start
To supply bleed air for pressurization
To drive a 40 Kva generator
To augment trust for take-off
Fuel for the APU is provided via
A cross-flow/ APU pump drawing fuel from both wings
An APU pump drawing fuel from the left collector tank
Right engine fuel feed manifold through a negative g check valve
Both a and c are correct
The green AVAIL light in the APU start/stop swichlight means:
APU bleed air is available
APU is able to supple electrical loading
APU is running
APU BITE test is complete
The AVAIL green light illuminate in the APU control panel indicate:
APU is ready to accept electrical loading only
APU is available for electrical loading
APU is ready to be started
APU is ready to be shutdown
The APU supplies pneumatic power for
Wing anti-ice
Cowl anti-ice
Thrust reverse
Engines start air conditioning
The APU control system ensures priority is given to
Electrical loads
Pneumatic loads
RPM
Fuel
The APU gauges appear when
APU POWER/FUEL switch/light is pressed in
APU START/STOP switch/light is pressed in
Battery master is selected on
XFLOW/APU PUMP switch/light is pressed in
On ground, the APU is supplying both electrical and pneumatic power simultaneously.As EGT increases above EGT limit which of the following occur
Generator loads sheds
APU shuts down
LCV modulates towards close
Left and right air conditioning packs close
From normal APu shutdown, the controls which are used consist of
APU SHUTOFF button and APU XFLOW swichlights
APU STAR/STOP bwichlight and PWR/FUEL bwichlight
APU STAR/STOP bwichlight and APU GEN button.
XFLOW MAN swichlight and APU SHUTOFF button
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