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What is Inertial Reference System?

Inertial Reference System A subsystem of an INS providing attitude, position, and velocity reference information for aircraft systems and crew.

Source: ICAO Doc 9432, FAA PCG

How is “Inertial Reference System” Used in Practice?

Ensure the Inertial Reference System is in NAV mode prior to departure.

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

inertial reference unitInertial Navigation Systemair-data inertial reference unitATA chapter reference

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Frequently Asked Questions

What is Inertial Reference System?

A subsystem of an INS providing attitude, position, and velocity reference information for aircraft systems and crew.

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