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Results tagged with apu
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user 3201
Auxiliary Power Unit. A device for providing alternate power to an aircraft, usually located in the aircraft's tail.
12
votes
Accepted
How are helicopters's avionics powered during power-off autorotation?
On largest rotorcraft, like CH-47, an APU is present, but is used only on the ground. …
- 80.9k
4
votes
Accepted
Is APU bleed air blow back a genuine risk on the 737?
and isolation valve would permit possible backpressure of the APU. … Note there is also a possibility of backpressure of the engines 9th stage by the APU at idle thrust, causing the engine valve to close:
With both the APU and engine bleed air valves open, and the engines …
- 80.9k
4
votes
Accepted
In normal condition, is the Airbus A320 APU fuel supplied by the main engine boost pump only?
The LH fuel line feeds the APU unless the pressure is too low. In this case the advisory "FUEL LO PR" will be displayed on the APU page of the lower ECAM and backup pump is started. …
- 80.9k
10
votes
Accepted
What is this device protruding from the rear of this 787?
As you have already imagined, it's the APU fuel line shroud drain, as visible here:
(Source)
Detail:
The fin gives an aerodynamic profile to the drain. … rather than do that, the fuel was pooling into the
APU exhaust cone. …
- 80.9k