On 1 September, the FAA approved supplemental type certificates (STC) allowing 100-octane unleaded avgas to be used in spark-ignition engines and ever.
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GAMI Awarded Long-Awaited STC For Unleaded 100-Octane Avgas
After more than three decades of research and development, general aviation finally has an approved unleaded 100-octane fuel. At AirVenture on Tuesday, the FAA formally awarded a supplemental type certificate (STC) to General Aviation Modifications Inc., the Ada, Oklahoma, company that itself spent more than a decade developing a fuel it calls G100. The fuel would be a drop-in replacement for 100LL which, despite lead content, continues to be manufactured under ongoing dispensation from the Environmental Protection Agency. But it may be quite some time before the fuel is fielded in volume and GAMI says it will probably cost 60 to 85 cents more than 100LL does now.