Flashcards in APU Deck (10)
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1
Max alt to start APU?
FL300
2
Max alt use for engine start?
FL210
3
Max alt use for AC electrical power?
FL 330
4
When is air and AC power available after APU start?
When reaching 95% plus three seconds.
5
On ground starting sequence?
FADEC initiates ignition after approximately 6% RPM and fuel flow after .5 second. Bat two energizes electronic starter controller. After light off FADEC commands starter cut out at 50% rpm.
6
GPU air start sequence.
Ignition starts at 7 to 17% and fuel flow at .5 second. Starter cut off at 50%.
7
Shutdown sequence
When knob rotated to off pneumatic power removed immediately. Electrical power removed at end of two minute cool down period. APU SHUTTING DOWN message appears at end of that period.
8
FADEC APU protection on ground
Overspeed
Under speed
FADEC Critical fault
APU FIRE
APU EGT over temp
High oil temp
Low oil pressure
Sensor fail
9
APU FADEC protection in the air
Overs speed
Under speed
FADEC critical fault
10
