Oral Bank - APU

Question 1

When does the EICAS memo message APU RUNNING display?

Answer 1

• APU selector ON, AND
• APU N1 RPM exceeds 91%

Question 2

Is electrical power available from the APU in-flight?

Answer 2

No

Question 3

Can the APU be operated in flight?

Answer 3

Yes, when left running for T/O up to 20,000ft

Question 4

How long should you wait before turning the battery switch off after the APU selector is rotated to OFF and why?

Answer 4

• 2 minutes
• Allows for a complete shutdown sequence, with fire detection capability