Based on the type certificates for the common airplanes and engines I looked at, the type certificates were re-issued with 100LL as an/the approved fuel under the type design. (This would be done after testing as required by FAA.)
That’s what the STC process does legally, just being done by the engine/airframe manufacturer instead of third party (presumably because they wanted to continue selling engines/airframes).
That’s what the STC process does legally, just being done by the engine/airframe manufacturer instead of third party (presumably because they wanted to continue selling engines/airframes).
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