aircraft systemsFAA-published question bank (Private Pilot, 2008)
Which would most likely cause the cylinder head temperature and engine oil temperature gauges to exceed their normal operating ranges?
A
Using fuel that has a lower-than-specified fuel rating.✓ Correct Answer
B
Using fuel that has a higher-than-specified fuel rating.
C
Operating with higher-than-normal oil pressure.
Explanation
PHAK Chapter 7 explains that fuel of a lower grade than specified can cause detonation and excessive cylinder head and oil temperatures, because it cannot withstand the engine's compression and heat. A higher grade does not cause overheating, and high oil pressure is not a cause of high temperatures.
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