APU Flashcards
0
Q
APU critical faults
A
Over speed
Under speed
FADEC critical fault
Will auto shutdown in air or on ground
1
Q
APU major faults
A
High oil temp.
Low oil press.
APU fire
Will auto-shutdown on ground only
2
Q
Min batt voltage for APU start
A
22.5 VDC
3
Q
Max altitude for APU start
A
FL300
4
Q
Max alt. for APU as an electric source
A
FL330
5
Q
Max altitude for APU assisted start
A
FL210
6
Q
Max APU EGT for start
Cont.
A
Start 1032*C
Cont 717*C
7
Q
When does APU electrics come on line
A
95% plus 3 sec.
8
Q
Can an APU be started after a critical or major fault
A
Critical fault - no
Major fault- yes
9
Q
Min. Batt temp for start
A
-20 *C
