PMU (Power Management Unit) Flashcards
1
Q
Power:
norm
A
PMA 32 VAC
2
Q
Power:
sec
A
28 VDC
3
Q
PMU reverts to 28 VDC when NP
A
< 40-50%
4
Q
modes:
ground
A
60% N1
5
Q
Modes:
flight
A
67% N1
6
Q
10,000 PA
A
N1 raised so Np is >80%
7
Q
PMU Fail
red highlight
A
PMU Fault; offline
+280shp to -550shp when PMU failed
8
Q
PMU Status
yellow highlight
A
WOW switch mismatch
9
Q
PMU aborts
A
940C/2s, 870C/4s, 840C/19s
N1 rise is 1/2 of normal
light off>10 sec
10
Q
IOAT
A
96-121 C=121C
>121C=PMU FAIL
11
Q
Auto Start Sequence
A
ST READY (green highlight)
energizes starter, boost pump, igniters
50%N1- starter, boost, igniters de-energize (aural tones)
12
Q
EDM FAIL
A
PMU actuated
>96C (Amber— missing ITT “pointes????”)
