Auxiliary Power Unit

Question 1

What controls the APU

Answer 1

A FADEC

Question 2

What will the APU shut down for automatically on the ground

Answer 2

Ground: Any malfunction (Fire after 10 seconds)
Air: Anything not heat realated

Question 3

What is the minimum battery voltage for attempting and APU start?

Answer 3

19.0V

Question 4

What power sources may be used to start the APU?

Answer 4

GPU
Battery 2 alone
Battery 2 assisted by one of the main generators

Question 5

What will occur if a fire is detected in the APU compartment while on the ground

Answer 5

An automatic shutdown will occur after 10 seconds

Question 6

What is the procedure for stopping the APU

Answer 6

APU Bleed Closed
XBLEED to AUTO
APU STOP Button
After APU as spun down to 0% APU Master OFF

Question 7

If the APU fails to start during refueling what should be done.

Answer 7

Complete the refueling process before attempting to restart the APU

Question 8

After Landing once parked at the gate, there is no GPU available. The APU is started to provide power to the aircraft. How long until the engine can be shut down

Answer 8

To prevent over-currents there should be a 1 min interval between the completion of the APU start to beginning an Engine shut down.