Aviation English
Aircraft Systems

What is mean sea level?

mean sea level An altitude or elevation reference based on the average sea level used as a standard for aviation altimetry.

Source: ICAO Doc 9432, FAA PCG

How is “mean sea level” Used in Practice?

Set altimeter to mean sea level pressure for standard altitude reference.

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

above ground levelair-data inertial reference unitinertial reference unitair-data reference

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Frequently Asked Questions

What is mean sea level?

An altitude or elevation reference based on the average sea level used as a standard for aviation altimetry.

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