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Private Pilot Licence (PPL) – Canada · Question

Why is 'frost' on an aircraft wing considered dangerous, even in small amounts?

Even a thin layer of frost significantly roughens the wing surface. This disrupts the smooth laminar flow of air, causing a reduction in lift and an increase in

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Question: Why is 'frost' on an aircraft wing considered dangerous, even in small amounts?

Answer options:

  • It adds significant weight to the aircraft.
  • It can block rudder movement. ✅ It disrupts smooth airflow over the wing, reducing lift and increasing drag.
  • It interferes with radio communication.

Correct answer: It disrupts smooth airflow over the wing, reducing lift and increasing drag.

Explanation: Even a thin layer of frost significantly roughens the wing surface. This disrupts the smooth laminar flow of air, causing a reduction in lift and an increase in drag, making takeoff and climb performance severely degraded or impossible.

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