Aviation English
MEL and CDL MEL and CDL

What is deferral?

deferral A formal process allowing a non-essential inoperative item to be left unrepaired for a specified time under MEL/CDL limits.

Source: ICAO Doc 9432, FAA PCG

How is “deferral” Used in Practice?

Deferral has been approved for this MEL item, maintenance must be completed within allowed interval.

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

Rectification interval extensioncorrective actionMaintenance control centermaintenance procedure

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Frequently Asked Questions

What is deferral?

A formal process allowing a non-essential inoperative item to be left unrepaired for a specified time under MEL/CDL limits.

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