Aeromedical factorsQuestion 737 of 934

A pilot smells exhaust gases in the cabin while the heater is on. What should the pilot do?

  1. Turn the heater to its highest setting to clear the fumes
  2. Close the vents and keep the heater on for warmth
  3. Shut off the heater and open the fresh air vents
  4. Continue the flight and watch for any symptoms
Show answer

Correct answer: Shut off the heater and open the fresh air vents

A pilot who detects exhaust odor should suspect CO and immediately shut off the heater and open air vents.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 8-1-4 Carbon Monoxide Poisoning in Flight, page 643

Practice aeromedical factors

Questions last reviewed: 18 October 2026