What is Critical surface?
Critical surface Any aircraft part essential for lift or control, including wings, control surfaces, and stabilizers, which must be clear of frost, ice, or snow for safe flight.
Source: ICAO Doc 9432, FAA PCG
How is “Critical surface” Used in Practice?
Confirm all critical surfaces are free of contamination before requesting takeoff clearance in winter operations.
Certification Exam Relevance
Who Needs to Know This Term?
- Pilots
- Air Traffic Controllers
- Cabin Crew
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What is Critical surface?
Any aircraft part essential for lift or control, including wings, control surfaces, and stabilizers, which must be clear of frost, ice, or snow for safe flight.
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