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Aircraft systems and instrumentsQuestion 597 of 934

Can carburetor icing occur when the outside air temperature is 100 °F?

  1. No, it needs outside air at or below 32 °F
  2. No, it needs humidity of at least 90 percent
  3. Yes, with humidity as low as 50 percent
  4. Yes, but only with the engine at full power
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Correct answer: Yes, with humidity as low as 50 percent

The sudden cooling in the carburetor can cause icing even in outside air as warm as 100 °F (38 °C).

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

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026