Aviation English
Long Haul

What is Drift Down Procedure?

Drift Down Procedure A contingency descent profile followed after an engine failure at cruise altitude to achieve the aircraft’s new single-engine ceiling while maintaining obstacle clearance.

Source: ICAO Doc 9432, FAA PCG

How is “Drift Down Procedure” Used in Practice?

Mayday, one engine out, commencing Drift Down Procedure from flight level 370 to maintain obstacle clearance until drift-down level reached.

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 Drift Down Procedure?

A contingency descent profile followed after an engine failure at cruise altitude to achieve the aircraft’s new single-engine ceiling while maintaining obstacle clearance.

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