Auxiliary Power Unit Flashcards
1
Q
Max altitude for starting?
A
37,000 ft
2
Q
Max altitude for APU operation?
A
41,000 ft
3
Q
Max altitude for APU bleed air extraction?
A
25,000 ft
4
Q
Max speed with APU door open?
A
220 KIAS if APU not operating
No speed limitation if APU is operating
5
Q
What battery voltage is required before starting the APU?
A
22 volts on both batteries
6
Q
What does the main battery power during APU start?
A
APU ECU
7
Q
What does the APU battery power during an APU start?
A
Cranking of the 28 VDC start motor
8
Q
When will the AVAIL switch light illuminate?
A
99% RPM plus 2 seconds
9
Q
Max permissible load on the APU Generator?
A
40 KVA
