weather theoryFAA-published question bank (Private Pilot, 2008)
In which environment is aircraft structural ice most likely to have the highest accumulation rate?
A
Cumulus clouds with below freezing temperatures.
B
Freezing drizzle.
C
Freezing rain.✓ Correct Answer
Explanation
Freezing rain consists of large supercooled drops that spread and freeze over the airframe, including behind protected areas, producing the highest rate of clear-ice accumulation. Freezing drizzle drops are smaller, and cumulus clouds, though they can ice rapidly, generally do not match the accumulation rate of freezing rain.
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