APU

Question 1

APU fault light reasons

Answer 1

APU fault sensed, auto shut down

APU fuel valve disagrees with commanded position

Question 2

Does the APU have a cooling cycle, if so why

Answer 2

Yes, thermal shock prevention

Question 3

Where is fuel supplied from for the APU

Answer 3

Left Manifold

Question 4

Which fuel pump operates in Auto for APU run

Answer 4

LEFT FWD AC FUEL PUMP

Question 5

Dark Plane what pump is used for APU start

And where is it located

Answer 5

DC fuel pump

Located in Left main Tank

Question 6

When is the APU available for usage

Answer 6

When the Run light is illuminated

Question 7

If battery selected off what happens to the APU and why
Ground

In flight

Answer 7

On Ground
Apu will shut down because no fire detection is available

In-flight
Apu will not be affected

Question 8

How do you monitor APU progress

Answer 8

Eicas status page

Question 9

APU start duty cycles

Answer 9

3 consecutive starts in 60 minutes

Question 10

Does the Apu take over from External power

Answer 10

No, not unless ext power is disconnected