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Flashcards in APU Panel Deck (5)
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1
Q

What does the illumination APU MASTER SW FAULT indicate?

A

Automatic APU shutdown has occurred.

2
Q

What is the significance of the APU AVAIL light illuminating?

A

APU is running above 99.5% or 2 seconds after N speed reaching 95%. In practical terms it is ready to accept and support ELEC and/or AIR load.

3
Q

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

A

APU fire

4
Q

With the APU green AVAIL light ON and the EXT PWR green AVAIL light on, which system is powering the aircraft?

A

2 Avails = APU powering the aircraft.

5
Q

If possible, how would the APU be used if it has already started the cool-down cycle?

A

Pressing the APU MASTER SW pushbutton