aircraft systemsFAA-published question bank (Private Pilot, 2008)
What type fuel can be substituted for an aircraft if the recommended octane is not available?
A
The next higher octane aviation gas.✓ Correct Answer
B
The next lower octane aviation gas.
C
Unleaded automotive gas of the same octane rating.
Explanation
If the specified grade is not available, PHAK Chapter 7 says a higher grade of aviation fuel may be used, while a lower grade must never be substituted because it can cause detonation. Automotive gasoline may be used only when the aircraft has a supplemental type certificate or other approval for it.
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