aircraft systemsFAA-published question bank (Private Pilot, 2008)
If the grade of fuel used in an aircraft engine is lower than specified for the engine, it will most likely cause
A
a mixture of fuel and air that is not uniform in all cylinders.
B
lower cylinder head temperatures.
C
detonation.✓ Correct Answer
Explanation
PHAK Chapter 7 warns that using a lower grade of fuel than specified can cause detonation, because the lower-octane fuel explodes rather than burning evenly under the engine's compression and temperature; it also raises cylinder head temperatures rather than lowering them.
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