APU

Question 1

In the event of an APU fire on the ground, how many seconds of delay will occur before an APU automatic shutdown is initiated?

Answer 1

10 seconds. AOM 2-09-05 page 1.

Question 2

At what point does FADEC allow electrical and pneumatic power extraction?

Answer 2

At 95% RPM + 7 seconds.

AOM 2-09-05 page 8.

Question 3

How should the APU be shut down normally?

Answer 3

Via the STOP button, from a loaded condition.

AOM 2-09-05 page 9.

Question 4

What does the APU STOP button do?

Answer 4

A stop request signal is sent to the FADEC to shut down the APU, and closes the APU Main Fuel Solenoid Valve.

AOM 2-09-05 page 9.

Question 5

What is the maximum altitude for APU start (C14)?

Answer 5

30,000 ft.

AOM 1-01-38 page 1.

Question 6

What is the maximum operating altitude of the APU (C14)?

Answer 6

37,000 ft.

AOM 1-01-38 page 1.

Question 7

What is the maximum EGT for APU start?

Answer 7

884°C.

AOM 1-01-38 page 1.

Question 8

What are the APU starter limits?

Answer 8

The cooling period required between each start attempt during a series of
3 consecutive start attempts is
-1 minute, and the cooling period required before

another series of 3 consecutive start attempts is 30 minutes.

AOM 1-01-38 page 1.