Aircraft systems and instrumentsQuestion 623 of 934

A pilot shuts down the engine, and turns off the battery and master switches. The ignition switch stays ON. Why is this dangerous?

  1. The battery will discharge through the starter
  2. The alternator will overheat without a load
  3. The electric fuel pump will keep running
  4. The engine can fire if the propeller moves
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Correct answer: The engine can fire if the propeller moves

The magneto requires no outside source of electrical power.

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