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Aircraft systems and instrumentsQuestion 661 of 934

Can anti-icing fuel additives replace carburetor heat?

  1. Yes, in all conditions if used properly
  2. Yes, if the additive is at high concentration
  3. No; additives do not replace carburetor heat
  4. Yes, but only in temperatures below 32 °F
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Correct answer: No; additives do not replace carburetor heat

The concentration of the additive is critical. Too little or too much reduces its effectiveness.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Fuel Systems — Fuel System Icing, page 188

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026