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Aircraft systems and instrumentsQuestion 640 of 934

What is detonation?

  1. A smooth burn that begins at the spark plug and spreads
  2. An uncontrolled, explosive ignition of the mixture
  3. Ignition of the mixture by a hot exhaust valve
  4. Fuel that burns after leaving the exhaust pipe
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Correct answer: An uncontrolled, explosive ignition of the mixture

Detonation causes excessive temperatures and pressures. It can quickly cause failure of the piston, cylinder, or valves.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Combustion, page 179

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026