Commercial Pilot License (CPL) Practice Exam 2025 - Free Commercial Pilot License Practice Questions and Study Guide

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What type of icing forms after the initial impact with a droplet, freezing into a smooth sheet?

Clear ice

Clear ice is formed when supercooled droplets of water strike an aircraft's surface and freeze into a smooth, glassy layer. This type of icing occurs when the droplets have a relatively large diameter and a higher impact velocity, allowing them to spread out before freezing. The smooth sheet of ice created by clear ice can make surfaces more aerodynamic but is hazardous as it increases weight and can drastically alter the aircraft's performance.

In contrast, rime ice typically forms from smaller droplets that freeze quickly upon contact, creating a rough and opaque texture. Mixed ice is a combination of both rime and clear ice, presenting characteristics of both types. The term "frozen ice" is not a standard classification in aviation meteorology, as it does not specify a particular process or form of icing.

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Rime ice

Mixed ice

Frozen ice

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