APU

Question 1

APU is the Only Source of Power:

Will AC Power be lost immediately when the APU is Turned off?

What about APU Pneunatics?

Answer 1

No. APU provides power for 1 minute if no other AC power source is available.

    APU Pneumatics will be removed immediately

Question 2

What happens if you turn the APU switch back to ON during its 1-minute Cool down period ?

Answer 2

APU will provide electrical power to electrical system.

Question 3

Can you do a Pre-Flight Walk around with the APU Running? Why or why not?

Answer 3

Yes,
because you are considered in the footprint of the aircraft

Question 4

What happens when the EMER STOP
(Guarded) Button is pushed IN?

Answer 4

Closes the APU Fuel SOV.
Shutting APU down with out 1 minute cooldown

   Also white stripe illuminates on bottom half of switch

Question 5

With NO fire indication, would anything happen if the guarded APU button ( on the fire extinguisher panel ) is pressed?

Answer 5

Yes, the APU SOV will close and the APU Fire extinguisher would discharge.

Question 6

GPU is powering the aircraft AC Power:

•Will APU provide AC Power to the Aircraft?

•How are APU Pneumatics affected?

Answer 6

•Power will be cut off immediately

•They will also be cut off immediately

Question 7

Will a APU FADEC Fault command an automatic shutdown of the APU?

Answer 7

Yes, APU FADEC Faults will command auto shutdown of APU within 10 Seconds after the fault is detected.