Aircraft systems and instrumentsQuestion 548 of 934

What is the purpose of pitot heat?

  1. To keep the static ports clear of insects
  2. To prevent blockage of the pitot tube by moisture
  3. To warm the air in the cabin heater duct
  4. To prevent carburetor icing in the induction air
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Correct answer: To prevent blockage of the pitot tube by moisture

The pitot tube may become blocked in flight by visible moisture. Use the AFM/POH procedures for pitot heat.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Blockage of the Pitot-Static System — Blocked Pitot System, page 213

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026