APU SYSTEM Flashcards
APU
Auxiliary Power Unit
The APU receives fuel through a solenoid-operated shutoff valve from the right wing tank. Fuel flow is approximately?
200 pph
The APU may not operate with less than ____ lbs fuel in the right tank.
1000
What electrical source can only be used to start the APU in the A/C
The Battery
Can the battery charge with the emergency generator?
No, the battery can only be charge with the primary Gen and the external power.
With the battery dead, can the external power start the APU?
No
After APU shutdown, how long should you wait to restart allowing the APU to cool.
4 minutes
ECU
Electrical control unit
The ECU signals the APU to shutdown for
Over speedcenter Over temperature Under voltage Exceeding APU start time No APU fire combustion
A fire detector is in the APU compartment as well as a nozzle for dispersing _____ lb. of bromotrifluoromethanen fire suppressant material.
2 1/4 lb.
Lifting the APU fire witch guard
Activates theswitch and shuts off fuel to the APU at a shutoff valve outside the APU compartment.
What is the ECU for?
The ECU protects the APU in the event of malfunction
Pump oil into APU until sight gauge reads within
One-half inch of FULL mark.
Who the last approval official for APU qual?
CO
After lifting APU FIRE switch, APU may continue to run for
15 to 25 sec
