APU

Question 1

What does the APU provide for us?

Answer 1

1. AC Power
2. Bleed Air

Question 2

What is the max starting altitude for the APU?

Answer 2

30,000’

Question 3

What is the max operating altitude for the APU?

Answer 3

33,000’

Question 4

What is the max altitude to use the APU bleed air for an engine start?

Answer 4

21,000’

Question 5

What is the max altitude to use the APU bleed air for the ECS?

Answer 5

15,000’

Question 6

When shutting down the APU before the batteries with no GPU, what should you do?

Answer 6

Wait for it to say OFF and then wait 90 seconds for an APU FUEL SOV CLOSED EICAS message.

Question 7

What is the sequence when selecting OFF for the APU?

Answer 7

Immediately turns of the APU bleed air.

After a 1 minute cooldown, fuel is shutoff, generator power is removed, and the FADEC is powered down.

Question 8

What is the sequence when selecting the APU Emergency Stop button?

Answer 8

Immediately closes the fuel SOV and shuts down APU with no cooldown period.

Question 9

When does the top half red stripe on the APU EMER STOP button illuminate?

Answer 9

When a fire is detected.