Limitation APU

Question 1

How many APU start can you do ?

Answer 1

3 then wait for 60min

Question 2

APU, what the max N speed ?

Answer 2

107%

Question 3

APU, what is the max EGT for APU start, and APU running ?

Answer 3

1090°C for start

675°C for running

Question 4

What is the maximum altitude at which the APU can be restarted on battery only (EMER ELEC) ?

Answer 4

25000ft

Question 5

What is the limit altitude for the APU to provide bleed air and electrical power ? Engine restart ?

Answer 5

22500ft for single pack, 15000ft for dual pack
20000ft Eng restart
Elect only up to 41000ft