Auxilary Power Unit Flashcards
Where does APU get fuel from Normally?
Right Tank
Describe the difference between APU Shutdown using Master switch off vs EMER stop?
-Master switch off - 1 min cooldown
-EMER off- shuts down immediately (closes fuel SOV for APU)
Where would we see APU RPM and EGT info?
EICAS
Maximum Altitude to start APU?
30,000 ft
At the gate, the GPU is pushed in and GPU connected, you start the APU, which is now supplying power to the Aircraft?
APU
List some reasons APU would shutdown on the ground? (UFO SHELF)
UFO SHELF
Underspeed
Fadec critical FAULT
Overspeed
Sensor failure
High oil temp
EGT overtemp
Low oil pressure
FIRE
When is Electrical and Pneumatic available during APU start?
95% plus 3 seconds
verify on electrical synopsis page
During normal shutdown of APU when is pneumatics Removed?
Immediately
During Normal shutdown of APU when is Electric power removed?
After 1 min cooldown
what is APU used for?
Bleed air for Air conditioning (packs)
Bleed Air for starting Engine
Electrical Power AC
List some reasons APU would shutdown Automatically in flight? (UFO)
Underspeed
Fadec critical fault
Overspeed
Operational Limit for APU as bleed source?
15000
Operational Limit for APU for engine start?
21000 ft
In the event an APU FIRE is detected, will the APU Shutdown automatically in flight?
NO
In the Event an APU FIRE is detected on ground wil APU shut down?
YES
