Aviation English
Basic ATC

What is Acknowledge?

Acknowledge An instruction to confirm that a message has been received and understood.

Source: ICAO Doc 9432, FAA PCG

How is “Acknowledge” Used in Practice?

ATC: N456CD, descend and maintain 3000 feet. Acknowledge.

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 Acknowledge?

An instruction to confirm that a message has been received and understood.

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