APU

Question 1

Max alt for APU start?

Answer 1

30 000 ft

Question 2

Max altitude AC power generation from APU?

Answer 2

33 000 ft

Question 3

Max altitude for APU assisted engine start?

Answer 3

21 000 ft

Question 4

Max altitude for using APU bleed for air conditioning?

Answer 4

15 000 ft

Question 5

To prevent, APU from unsuccessful start, how long should you wait to start APU after EICAS is energized?

Answer 5

30 seconds

Question 6

After APU start, when does the APU provide AC power and bleed air?

Answer 6

95% RPM + 3 seconds

Question 7

What happens when you turn the APU MASTER SELECTOR to ON after having started a normal shut down?

Answer 7

Shut down is cancelled

Question 8

If you get APU fire in flight, does the APU automatically shut down?

Answer 8

No, however on ground it shuts down automatically.

Question 9

Is there any cool down period when using the emergency shut down function of the APU?

Answer 9

No

Question 10

EICAS caution APU FAIL means…

Answer 10

Automatic shut down has occurred.

Restart cannot be done except if:
Shut down occurred during starting sequence and;
According to restrictions in AFM.

Question 11

EICAS caution APU FAULT means…

Answer 11

APU Automatic shut down in flight inhibited.

Anomaly detected.

Maintenance required.