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Aircraft systems and instrumentsQuestion 596 of 934

Under which conditions is carburetor ice most likely to occur?

  1. Temperature above 90 °F and relative humidity below 30 percent
  2. Temperature below 70 °F and relative humidity above 80 percent
  3. Temperature below 0 °F and relative humidity below 10 percent
  4. Temperature above 100 °F and relative humidity below 20 percent
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Correct answer: Temperature below 70 °F and relative humidity above 80 percent

Carburetor ice is most likely when the temperature is below 70 °F (21 °C) and the humidity is above 80 percent.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Induction Systems — Carburetor Icing, page 169

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Questions last reviewed: 18 October 2026