APU Flashcards
First flight of the day. Before APU start, what must be done?
Fire detection test
What is the minimum battery voltage to start the APU? Where would you verify that?
22 V on the DC electric synoptic page
What is the APU start limitation?
22V
FL370
3starts/hr. 2 minute wait
What does the illumination of the PUMP FAIL on the PWR FUEL switchlight indicate?
APU fuel pump FAIL
What does the illumination of the PUMP FAIL on the PWR FUEL switch light indicate?
SOVE not in commanded position
What are the APU priorities?
1 electrical,
2 pneumatics
What is the top altitude we can use the APU for electrical loading?
FL410
What is the top altitude we can start the APU?
FL 370
What is the top altitude for bleed air extraction?
FL 250
Where is the APU fuel supply from?
Left collector tank
If the APU fuel pump fails, will it shut down?
No, but no restart
For an unattended APU fire on the ground, what will happen?
In flight?
Shut down and extinguish automatically on the ground.
IShut down automatically in-flight, but manually extinguish.