aircraft systemsFAA-published question bank (Private Pilot, 2008)
The uncontrolled firing of the fuel/air charge in advance of normal spark ignition is known as
A
combustion.
B
pre-ignition.✓ Correct Answer
C
detonation.
Explanation
PHAK defines preignition as ignition of the fuel/air mixture before the normal spark, usually caused by a hot spot in the cylinder. Detonation is the explosive, uncontrolled burning of the charge after normal ignition, and combustion is the normal, controlled burning.
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