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A comment on EPA moves towards banning leaded aviation gas. Parent comment

Re:EPA moves towards banning leaded aviation gas by sokoloff on Friday October 27, 2023 @05:10PM (#38043989)
Legally, they need to run a fuel which is approved on the type certificate data sheet for their engine (and the engine-airframe combination).

The recently developed G100UL unleaded fuel requires a change to the type certificate of the airplane (by serial number) and engine(s) (by serial number) to be legal.

Until that supplemental type certificate existed, these airplanes did legally need leaded fuel.

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Re:EPA moves towards banning leaded aviation gas by kube-system on Friday October 27, 2023 @05:24PM (#38044177)
I am aware, and was presuming that to be covered by the

> Once it's legal

exception above.

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Re:EPA moves towards banning leaded aviation gas by mchid on Saturday October 28, 2023 @05:39PM (#38053640)
No, G100UL is a full drop in replacement that meets the standards off AVGAS which is what is required by the certificate. Fully legal on all engines with no change to the certificate.
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Re:EPA moves towards banning leaded aviation gas by sokoloff on Saturday October 28, 2023 @08:00PM (#38054620)
It does not meet the composition standard of 100LL, which is why you need to buy an STC from GAMI to use it legally in an aircraft.
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