B747 APU EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++

B747 APU EXAM QUESTIONS AND ANSWERS WITH

COMPLETE SOLUTIONS GRADED A++


What are the start sources for the APU, and which one do we normally use?

- TR (TRU), when Utility Bus 4 is powered

- APU Battery, when Utility Bus 4 is UNPOWERED

- TR is the normal switch position

Can the APU be operated in flight?

YES, when left on for takeoff, it can be operated up to 20,000 feet

Is the electrical power available from the APU in flight? And how about the APU

bleed air?

- NO! Electrical power is not available in flight

- YES, APU bleed air is available in flight for one pack up to 15,000 feet

What APU components are powered by the APU Battery?

- Inlet door

- APU controller

- DC fuel pump

- APU fire detection system

What APU components are powered by the main battery?

- APU fire extinguisher

- Standby power for APU controller

- APU fuel valve