Aviation English
Aircraft Systems

What is auxiliary power unit?

auxiliary power unit A self-contained turbine engine providing electrical and pneumatic power to the aircraft while on the ground or as backup in flight.

Source: ICAO Doc 9432, FAA PCG

How is “auxiliary power unit” Used in Practice?

Auxiliary power unit will supply electrical power during engine start and ground operations.

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

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Frequently Asked Questions

What is auxiliary power unit?

A self-contained turbine engine providing electrical and pneumatic power to the aircraft while on the ground or as backup in flight.

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