APU

Question 1

When will the APU shut down in flight?

Answer 1

U - Underspeed
F - FADEC fault
O - Overspeed

Question 2

When will the APU shut down on the ground?

Answer 2

U - Underspeed
F - FADEC fault
O - Overspeed
S - Sensor failure
H - High oil temperature
E - EGT overtemp
L - Low oil pressure
F - Fire