Aircraft systems and instrumentsQuestion 612 of 934

What is impact icing?

  1. Ice that forms inside the venturi from fuel vaporization
  2. Ice on the aircraft exterior that blocks the air intake
  3. Ice that forms on the propeller and reduces thrust
  4. Ice that forms in the fuel lines from water in the fuel
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Correct answer: Ice on the aircraft exterior that blocks the air intake

Fuel injection is less susceptible to icing than a carburetor, but impact icing is possible in either system.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Fuel Injection Systems, page 172

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026