B757 APU

Question 1

APU Fire System

Answer 1

APU fire detection
APU fire warning
APU fire extinguishing

Question 2

APU Electrical max altitude?

Answer 2

42,000 ft

Question 3

APU pneumatics max altitude?

Answer 3

17,000 ft

Question 4

What happens to the APU when main battery is turned off on the ground?

Answer 4

Causes APU shutdown with cool down period, without fire detection.

Question 5

APU starter duty

Answer 5

3 attempts in 60 minutes

Question 6

When is the APU normal to be started?

Answer 6

Receipt of the ACARS Final W and B, or

Minutes prior to scheduled block out

Question 7

APU Fire is auto extinguished if . . . ?

Answer 7

1. On the ground

2. Both fuel control switches in cutoff