Aircraft systems and instrumentsQuestion 624 of 934

The ground wire between the magneto and the ignition switch is broken. The engine accidentally starts. How can the pilot stop it?

  1. Turn the master switch and the battery switch off
  2. Move the mixture lever to the idle cutoff position
  3. Turn the fuel selector to the other tank
  4. Set the carburetor heat to hot and open the throttle
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Correct answer: Move the mixture lever to the idle cutoff position

After that, a qualified AMT must check the system.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Ignition System, page 176

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026