Aviation English
Fueling Deicing

What is Clear ice?

Clear ice A transparent, smooth, and hard ice layer formed by the slow freezing of supercooled water droplets on aircraft surfaces, posing a significant aerodynamic hazard.

Source: ICAO Doc 9432, FAA PCG

How is “Clear ice” Used in Practice?

Advise if any clear ice has formed on the leading edge after descent through visible moisture.

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 Clear ice?

A transparent, smooth, and hard ice layer formed by the slow freezing of supercooled water droplets on aircraft surfaces, posing a significant aerodynamic hazard.

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