B747 Oral Questions - 7) APU

APU
When does the EICAS memo message "APU RUNNING" display?

When the APU selector is ON and APU N1 RPM exceeds 95% N1
APU
Is electrical power available from the APU in flight?

No
APU
Can the APU be operated in flight?
- Yes
- When left running for t/o it can be operated in flight up to 20,000 ft
APU
How long should you wait before turning the battery switch OFF after the APU selector is rotated to OFF and why?
- 2 minutes
- Allows for a complete shutdown sequence, with fire detection capability

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Birddog370

344905

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B747 Oral Questions - 7) APU

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B747 Oral Questions - APU

Updated

2019-01-27T03:37:25Z

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