Aviation English
Basic ATC

了解とは？

了解 A standard radiotelephony term meaning 'I have received all of your last transmission'; it does not imply compliance or agreement.

Source: ICAO Doc 9432, FAA PCG

How is “了解” Used in Practice?

タワー：現在の進路を維持してください。パイロット：了解、現在の進路を維持します。

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

了解とは？

A standard radiotelephony term meaning 'I have received all of your last transmission'; it does not imply compliance or agreement.

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