10. APU✅

Question 1

What does the illumination of APU master switch fault Indicate?

Answer 1

Automatic APU shut down has occurred

Question 2

What is the significance of the APU available light illumination?

Answer 2

APU is running above 99.5% or 2 seconds after N speed reaching 95% (in practical terms it is ready to except and support electrical and or air load)

Question 3

What condition in the APU system would cause an external horn to sound?

Answer 3

APU fire

Question 4

With the APU green available light on and the external power green available light on, which system is powering the aircraft?

Answer 4

2 avails = APU powering the aircraft

Question 5

During the cooldown cycle can you still use the APU?

Answer 5

Yes, press the APU master switch pb