Aviation English
Flight Planning

What is Unchanged?

Unchanged Take‑off Using An Assumed Temperature Higher Than Actual To Reduce Thrust And Prolong Engine Life While Meeting Performance Requirements.

Source: ICAO Doc 9432, FAA PCG

How is “Unchanged” Used in Practice?

Unchanged

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

UnchangedThrust reductionFlexible Assumed TemperatureUnchanged

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Frequently Asked Questions

What is Unchanged?

Take‑off Using An Assumed Temperature Higher Than Actual To Reduce Thrust And Prolong Engine Life While Meeting Performance Requirements.

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