APU

Question 1

Why does the fault light come on when starting?

Answer 1

Monitors the APU fuel valve operation.

Question 2

What is the duty start cycle for APU

Answer 2

3 starts in 60 minute

Question 3

Which battery provides fire protection during start ?

Answer 3

Aircraft batt.

Question 4

What happens in the air and on ground if battery selected off.

Answer 4

In air Apu remains on

On ground Apu shuts down .

Question 5

What happens if APU fault light?

Answer 5

Apu will automatically shut down .

Question 6

What does the fault light indicate if Apu shut down ?

Answer 6

The Apu fuel valve is not in the commanded position

Question 7

Limitation of Apu bleed and electrical load ?

Answer 7

17000 feet for bleed air .

42000 feet for electrical.

Question 8

Why does the Apu not shut down on taxi.

Answer 8

Because the engine fuel controls witches are in the run position.