PMU (Power Management Unit) Flashcards

1
Q

Power:

norm

A

PMA 32 VAC

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2
Q

Power:

sec

A

28 VDC

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3
Q

PMU reverts to 28 VDC when NP

A

< 40-50%

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4
Q

modes:

ground

A

60% N1

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5
Q

Modes:

flight

A

67% N1

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6
Q

10,000 PA

A

N1 raised so Np is >80%

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7
Q

PMU Fail

red highlight

A

PMU Fault; offline

+280shp to -550shp when PMU failed

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8
Q

PMU Status

yellow highlight

A

WOW switch mismatch

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9
Q

PMU aborts

A

940C/2s, 870C/4s, 840C/19s
N1 rise is 1/2 of normal
light off>10 sec

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10
Q

IOAT

A

96-121 C=121C

>121C=PMU FAIL

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11
Q

Auto Start Sequence

A

ST READY (green highlight)
energizes starter, boost pump, igniters
50%N1- starter, boost, igniters de-energize (aural tones)

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12
Q

EDM FAIL

A

PMU actuated

>96C (Amber— missing ITT “pointes????”)

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