APU Flashcards
0
Q
Where is the APU located?
A
Aft of the nose wheel well.
1
Q
What is the function of the APU?
A
- Electrical power for ground maintenance.
- Bleed air for ground air conditioning and engine starting
- Inflight emergency electrical power.
2
Q
What circuit breaker are on the “APU Essential Bus”?
A
- Intake door
- Exhaust Door
- Doors Position Light
- Fire Detection Horn
- Fire Extinguisher Manual Cont
- Fire Extinguisher Manual Rel
- Fire Extinguisher Auto Cont
- Fire Extinguisher Auto Rel
3
Q
Where does the APU get its power for ground start?
A
GOB
4
Q
Where does the APU get its power for Inflight start?
A
Mon Essential DC
5
Q
What causes an automatic APU shutdown?
A
- APU Fire
- Loss of oil pressure
- Overspeed of 106%
6
Q
What is the normal RPM for APU on ground?
A
98%-102%
7
Q
At what temperature will APU fire warning go off?
A
400° C
8
Q
Where is the APU load control valve located?
A
HELL HOLE!
9
Q
What is the purpose of the Load Control Valve?
A
It limits turbine discharge temperature by limiting bleed air below an amount that would cause turbine overtemperature.
10
Q
How many Bleed-Air start valves are there and where are they located.
A
4, one on each engine.
