APU *

Question 1

Bleed air extraction from APU is not permitted above what altitude?

Answer 1

25,000 ft.

Question 2

Can you use APU bleed air to start engine?

Answer 2

Yes

Question 3

If the APU door is not closed or the door position is unknown, what’s the max air speed you can fly?

Answer 3

220 KIAS, or the APU must remain in operation.

Question 4

What’s the highest altitude you can operate the APU

Answer 4

41,000 ft.

Question 5

What’s the max altitude allowed to start the APU?

Answer 5

37,000 ft.

Question 6

Maximum altitude for using APU bleed air?

Answer 6

25,000 ft.

Question 7

What is the APU starter motor duty cycle limit?

Answer 7

3 start attempts in 1 hour, with a 2 minute delay between each attempts

Question 8

APU ground starting altitude limit?

Answer 8

15,000 ft

Question 9

Start assisted man engine start (MES) using APU bleed air is limited to what altitude?

Answer 9

21,000 ft

This is not APU limitation, but an in-flight MES altitude limitation