FAA Questions/Aircraft Dispatcher/Question #23
weather theoryFAA-published sample question (ADX, Aug 2021)

Even a small amount of frost, ice, or snow may

A

increase takeoff performance.

B

hinder lift production to a point where takeoff will be impossible.✓ Correct Answer

C

decrease takeoff ground run.

Explanation

Even a thin layer of frost, ice or snow roughens the wing enough to reduce lift and increase drag and stall speed, possibly to the point where takeoff is impossible (AC 91-74B). It never improves takeoff performance or shortens the ground run.

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