APU

Question 1

Which has priority, APU Air or Electrical?

Answer 1

Electrical

Question 2

When will the APU automatically shutdown?

Answer 2

• A fire is sensed
• Low oil pressure (2 psi)
• Turbine over speed (110%)

Question 3

What does selecting START (momentary) do?

Answer 3

• initiates start sequence

- ram door opens (may take up to 60 secs)

Question 4

When does the APU starter disengage?

Answer 4

35% RPM

Question 5

When will Air be available from the APU?

Answer 5

60 second delay timer after APU up to running speed (95%), it opens the Bleed Load Control Valve

Question 6

How much fuel does the APU burn?

Answer 6

250 lbs per hour

Question 7

Where does the APU get its fuel from?

Answer 7

Normally the right main tank

Can be supplied from center or left main tank (fuel crossfeed)

Question 8

When will the fuel shutoff valves automatically close for the APU?

Answer 8

• Fire

- DC power is lost

Question 9

How long does it take to manually open the RAM or NON-RAM doors? (both momentary switches)

Answer 9

24 seconds

Question 10

What’s the APU EGT limitations on start?

Answer 10

760* C for 30 seconds

Question 11

Will turning the Battery switch off affect the APU running?

Answer 11

-the battery is required for APU operation, turning it off would shutdown the APU