weather theoryFAA-published question bank (Private Pilot, 2008)
One in-flight condition necessary for structural icing to form is
A
small temperature/dewpoint spread.
B
stratiform clouds.
C
visible moisture.✓ Correct Answer
Explanation
Structural icing requires visible moisture (clouds, drizzle, rain) and an aircraft surface at or below freezing, as PHAK and AC 91-74B explain. A small temperature/dewpoint spread does not by itself mean liquid water is present, and ice forms in cumuliform as well as stratiform clouds.
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