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Debate intensifies over readiness of unleaded avgas replacement

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Debate intensifies over readiness of unleaded avgas replacement
Policy
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Ivy Ericksen Publisher | AVweb

Tensions flared briefly at a forum on progress toward an unleaded replacement for avgas on Monday. During the public comment period after formal presentations, Tim Roehl, president of General Aviation Modifications Inc., challenged points made by members and support staff from the End Aviation Gasoline Lead Emissions (EAGLE). Roehl informed the crowd that GAMI’s G100UL is ready for distribution and sale, contrary to assertions made during the formal part of the forum. EAGLE member Pete Bunce, president of the General Aviation Manufacturers’ Association, stood up and dismissed Roehl’s assertion. “I totally disagree but that’s a discussion for another day,” said Bunce.

In earlier comments, Bunce emphasized his organization’s commitment to ensuring any new fuel is approved through “transparency and a peer-reviewed process,” traditionally done through ASTM International. “Transparency is so absolutely vital for us,” said Bunce.

Refiner Vitol Aviation has 1.3 million gallons of G100UL in tanks in Texas and claims it has been vetted as ready for sale through its STC. GAMI and Vitol maintain that FAA approval of an STC covering all gasoline engines on the FAA registry satisfies all regulatory and safety requirements to begin retail distribution of the fuel. However, critics argue it needs a consensus standard determined by an independent organization like ASTM to address concerns about materials compatibility.

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AOPA President Mark Baker stated his organization is using G100UL in a Beech Baron it operates and noted that based on 200 hours of experience with the fuel, “GAMI is as good or better” than 100LL. He also emphasized the need to “move forward” to get the correct fuel.

The remainder of the meeting reiterated EAGLE's goals, which have increasingly focused on maintaining the supply of 100LL. The availability of commercial quantities of G100UL has led politicians in California and Colorado to attempt to ban 100LL in favor of filling airport tanks with G100UL. Legislative and legal initiatives in both states are progressing.

Meanwhile, testing under the congressionally mandated Piston Aviation Fuel Initiative (PAFI) continues at the FAA’s Atlantic City test facility. Approximately 23% of materials compliance testing, 25% of durability testing, and a few percent in several other categories have been completed on Lyondell/Basell/VP Racing’s entry. It has also been fully tested on a Lancair Legacy airframe and a Continental TSIO 550K engine.

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