3 ms·
Weren't many of the planes in operation today certified before 100LL became the only available grade (excluding things like 115/145 or even more exotic brews wh
by jabl 3y ago
Weren't many of the planes in operation today certified before 100LL became the only available grade (excluding things like 115/145 or even more exotic brews which I guess today are used only at Reno air races and such)? E.g. 80/87 for lower performance engines, and 100/130 for higher performance ones. So presumably they were somehow grandfathered in when 100LL replaced these grades? So why can't the same be done for a hypothetical "100UL" spec?
- sokoloff 3y agoBased 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).