Aircraft systems and instrumentsQuestion 598 of 934

An airplane has a fixed-pitch propeller. What is the first indication of carburetor icing?

  1. A decrease in engine rpm
  2. An increase in engine rpm
  3. An increase in oil pressure
  4. A decrease in oil temperature
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Correct answer: A decrease in engine rpm

Roughness may follow the rpm decrease.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Induction Systems — Carburetor Icing, page 170

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Questions last reviewed: 18 October 2026