Aviation English
Aircraft Systems

What is trim air?

trim air A system that adds small amounts of hot bleed air to the mixed supply to fine-tune cabin temperature zones.

Source: ICAO Doc 9432, FAA PCG

How is “trim air” Used in Practice?

The trim air system is offline, so some cabin sections may experience cooler temperatures.

Certification Exam Relevance

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

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

Related Aviation English Terms

Cabin temperature controloutside air temperaturecabin intercommunication systemexhaust gas temperature

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Frequently Asked Questions

What is trim air?

A system that adds small amounts of hot bleed air to the mixed supply to fine-tune cabin temperature zones.

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