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Aircraft systems and instrumentsQuestion 637 of 934

How does a light airplane usually produce cabin heat?

  1. An electric heater in the cabin warms the air
  2. Warm air is taken from the carburetor heat box
  3. Outside air passes a shroud around the muffler
  4. Hot oil from the engine flows past the cabin
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Correct answer: Outside air passes a shroud around the muffler

The muffler is heated by the exiting exhaust gases. The heated air goes to the cabin for heat and defrost.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Exhaust Systems, page 178

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026