Auxiliary Power Unit

Question 1

After three consecutive APU start attempts, the flight crew must wait … min before a new start attempt.

Answer 1

60

Question 2

Maximum APU Rotor N speed

Answer 2

107 %

Question 3

Maximum EGT for APU start

Answer 3

1 250 °C

Question 4

Maximum EGT for APU running

Answer 4

650 °C

Question 5

During refuel/defuel procedures, APU starts or shutdown are permitted with the following restrictions:

Answer 5

‐ If the APU failed to start or following an automatic APU shutdown, do not start the APU
‐ If a fuel spill occurs, perform a normal APU shutdown.

Question 6

When JET B or JP4 is used, APU operation is limited to …

Answer 6

25 000 ft

Question 7

APU ground operation maximum altitude

Answer 7

14 600 ft

Question 8

APU flight operation maximum altitude for bleed air and electric power:

Answer 8

22 500 ft

Question 9

APU flight operation maximum altitude electric power only:

Answer 9

41 450 ft

Question 10

APU Battery Restart Limit

Answer 10

25 000 ft

Question 11

APU maximum altitude to assist engine start

Answer 11

20 000’

Question 12

APU Max altitude for air conditioning and pressurization (single pack operation)

Answer 12

22 500’

Question 13

APU Max altitude for air conditioning and pressurization (dual pack operation)

Answer 13

17 500’

Question 14

APU bleed air for wing anti-ice is …

Answer 14

Not permitted