Aviation English
Meteorology

What is International Standard Atmosphere Deviation?

International Standard Atmosphere Deviation The difference between the actual atmospheric temperature and the standard temperature defined by the International Standard Atmosphere at a given altitude.

Source: ICAO Doc 9432, FAA PCG

How is “International Standard Atmosphere Deviation” Used in Practice?

Report ISA deviation in degrees Celsius at flight level three five zero.

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 International Standard Atmosphere Deviation?

The difference between the actual atmospheric temperature and the standard temperature defined by the International Standard Atmosphere at a given altitude.

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