Plain English Meaning
An FAA notice from 2011 warning pilots that car gas is not automatically safe for aircraft engines. Most car gas now contains ethanol, which can damage aircraft fuel systems, and using car gas at all requires a special FAA approval for your specific aircraft.
Full Definition
A Special Airworthiness Information Bulletin issued by the FAA's New England region in 2011 that addresses the use of automotive gasoline (autogas) in aircraft. It alerts owners and operators to the risks of using auto fuel that contains ethanol or other alcohols in piston aircraft engines, and it reminds them that any use of autogas requires a valid Supplemental Type Certificate (STC) for the specific aircraft and engine combination.
Context Anchor
Seen in fuel grade discussions, especially when the handbook talks about using gasoline instead of .