APU

Question 1

What type of compressor does the APU have?

Answer 1

single stage centrifugal compressor.

Question 2

What position should the ELPMPs be on for APU operation?

Answer 2

Z

Question 3

What are two things to do BEFORE turing on the APU?

Answer 3

1. ELPMPs AUTO

2. Fire test APU

Question 4

What is the only thing the APU will shut down for in flight?

Answer 4

Overspeed.

Question 5

Will the APU auto shutdown with a fire?

Answer 5

NO

Question 6

Whats the procedure to shut down the APU?

Answer 6

1. APU STOP button and APU GEN OFF within 1 second

2. Wait until APU less than 10%, then APU master OFF.

Question 7

If you have an APU flameout with no CAS message can you restart it?

Answer 7

Yes, but only one restart.

Question 8

If you have an APU flameout with a CAS message; “APU LIMIT EXCEEDED” can you restart it?

Answer 8

NO.

Question 9

Can you use APU bleed for ECS on the ground with the engines running?

Answer 9

NO

“Except as necessary for takeoff, DO NOT use APU bleed for ECS on the ground with one or both engines running”

Question 10

What are the altitude limits for the APU?

Answer 10

Operation up to FL300.

APU starting up to FL200.

Question 11

When can you select APU bleed air on?

Answer 11

After a minimum 2 minute wait time after selecting the APU Generator ON.

Question 12

What automatic shutdown protection is provided for the APU on the ground?

Answer 12

Overtemperature, Overcurrent, Overspeed, low oil pressure, high oil temperature, loss of EGT or RPM signals.

Question 13

What is the APU make?

Answer 13

Garrett GTCP-36-150