Which statement best describes preignition?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which statement best describes preignition?

Explanation:
Preignition is ignition of the fuel-air mixture in the cylinder before the normal ignition timing. This happens when a hot spot in the combustion chamber—such as a carbon deposit or a hot spark plug—ignites the charge early. The result is higher pressures and temperatures occurring earlier in the cycle, which can cause rough engine operation, loss of power, and potential damage if it continues. It’s distinct from detonation, which is the spontaneous ignition of the end gas after the spark has occurred; preignition is about ignition before the normal spark timing.

Preignition is ignition of the fuel-air mixture in the cylinder before the normal ignition timing. This happens when a hot spot in the combustion chamber—such as a carbon deposit or a hot spark plug—ignites the charge early. The result is higher pressures and temperatures occurring earlier in the cycle, which can cause rough engine operation, loss of power, and potential damage if it continues. It’s distinct from detonation, which is the spontaneous ignition of the end gas after the spark has occurred; preignition is about ignition before the normal spark timing.

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