APU Panel Flashcards

1
Q

What does the illumination APU MASTER SW FAULT indicate?

A

Automatic APU shutdown has occurred.

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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.

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3
Q

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

A

APU fire.

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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.

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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.

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6
Q

When running the securing checklist, why is it important to wait 2 minutes after the APU avail light goes out before switching off the batteries?

A

Switching the batteries off before the APU flap is closed may cause smoke in the cabin during the next flight.

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