Get the Lead Out! The EPA's finding that leaded aircraft fuel is harmful to humans sets the stage for the eventual full transition to unleaded.

The article focuses on the ongoing transition from leaded to unleaded aviation gasoline (avgas) for piston-powered aircraft in the United States, driven by the US Environmental Protection Agency’s (EPA) 2023 determination that lead emissions from aircraft fuel endanger public health. General Aviation Modifications Inc. (GAMI) developed G100UL, the only FAA-approved high-octane unleaded avgas as of 2022, which has undergone successful testing in both fixed-wing aircraft and piston helicopters, including those from Robinson Helicopter Company. Several other companies, such as Swift Fuels and LyondellBasell, are developing unleaded alternatives at various approval stages, while airports like Centennial Airport in Colorado are subsidizing the use of unleaded fuels to encourage adoption. Despite progress, challenges remain regarding fuel formulations, engine compatibility, and market acceptance, with some operators like the University of North Dakota temporarily reverting to leaded fuel due to maintenance concerns. The industry and regulators continue to collaborate through initiatives like the Eliminate Aviation Gas Lead Emissions (EAGLE) program, aiming for a safe, phased transition to unleaded avgas by 2030 or sooner.