Aerospace & Aviation Industry Alert: Oklahoma Company Makes Major Announcement Changing Aviation Industry

Submitted by Sandra Shelton on Fri, 08/06/2021 - 3:29pm
Dear Friends of Aerospace and Aviation, 

Oklahoma has just returned from the Experimental Aircraft Association’s AirVenture at Oshkosh, WI. For many years an Oklahoma delegation has attended the world’s largest fly-in with a goal of promoting the state by recruiting businesses to relocate or expand their presence into Oklahoma and by ensuring the masses of pilots and aviation enthusiasts at Oshkosh know the tourism opportunities our state holds.  

This year the Aeronautics Commission, Department of Commerce, Tourism Department, and our business and community partners had the best year in Oshkosh ever. Oklahoma also received excellent attention thanks to a major announcement by Ada-based company, General Aviation Modification Inc. or GAMI, when the news was released that they’d received the first-ever Federal Aviation Administration (FAA) STC approval for their G100UL unleaded avgas.

GAMI has worked for 11 years to develop an unleaded avgas solution that maintains or improves engine performance while reducing maintenance costs caused by the use of leaded fuel. This innovation will keep general aviation aircraft flying efficiently and ensuring a quality environment for decades to come.  We could not be more proud of GAMI, and all of the 1,100 aerospace and aviation companies across our state!  Keep flying, Oklahoma. 

State Director of Aeronautics


First High Octane Unleaded Avgas Approved by FAA

OSHKOSH, Wis. / July 27, 2021 / Aviation News - General Aviation Modifications, Inc., (GAMI)—a leading general aviation engineering company—announces the FAA has approved Supplemental Type Certificates (STCs) authorizing use of its G100ULTM high-octane unleaded avgas.

GAMI elected to follow the well-established FAA Approved Model List (AML) STC process whereby the FAA issues the initial STCs with an AML of specific aircraft and engines, and then progressively expands the scope of that AML based on additional testing and data.

These new STCs represent the initial major milestone for bringing G100UL avgas to airports and aircraft across North America. As the Approved Model List for these STCs expands over the next several quarters, the scope of the aircraft and engines on the AML will provide the functional equivalent of a fleet-wide certification for spark ignition piston powered aircraft and engines to operate on G100UL avgas.

Next Steps
The scope of engine and airframe testing now approved by the FAA was comprehensive. In further collaboration with the FAA, GAMI will complete two additional tests that will provide the data required to vastly expand the scope of the Approved Model List. These two routine tests are already underway, and will repeat and validate earlier successful testing previously approved by the FAA. When these tests are completed, the pathway to a large expansion of the Approved Model List will be clear, and when the AML is fully expanded, G100UL avgas will provide a functional fleet-wide drop-in replacement for 100LL.

As GAMI keeps its focus on expanding the AML, it has collaborated with Avfuel Corporation—a leading global supplier of aviation fuel and services—to work through the logistics of distributing this first-ever high octane unleaded aviation gasoline. Avfuel is establishing a supply chain to responsibly bring G100UL avgas to market on a commercial scale. Together, GAMI and Avfuel have committed to a process that will ensure G100UL avgas is available to all legitimate distributors and vendors on an equitable basis in terms of access and economics.

Once the FAA expands the AML and production of G100UL avgas expands to support the needs of the market, GAMI anticipates the existing blue 100LL avgas will disappear from the market, providing a long-awaited solution to the environmental and engine operational pitfalls of leaded fuel. Based on plans for expanded production, GAMI anticipates G100UL avgas supply will meet North America’s demand for high octane aviation gasoline within the next four years.

GAMI, in conjunction with its sister-company, Tornado Alley Turbo, Inc., (TAT) has extensive experience with the FAA STC process as more than 30,000 high performance aircraft and engines fly with its FAA-certified products. Leveraging this regulatory certification experience, GAMI has worked diligently for 11 years to develop a functional drop-in unleaded avgas solution that maintains or improves engine performance and, simultaneously, significantly reduces routine maintenance costs imposed by the use of leaded avgas. Achieving these goals also resolves the ever-present and existential threat to both the environment and the use of high performance piston powered general aviation aircraft if a commercially viable unleaded avgas replacement was not found. Ultimately—by providing a suitable alternative prior to any possible regulatory ban on leaded fuels—the widespread use of G100UL avgas preserves and protects an integral component of the national air transportation system: high performance spark ignition piston-engine aircraft.
Developing a commercially viable unleaded high-octane aviation gasoline proved to be a complex challenge due to a myriad of technical and economic issues. At the beginning of the project, GAMI developed an essential set of design requirements. These requirements included the necessity for a single high octane unleaded avgas to be compatible with all of the existing aviation gasolines when the different existing fuels are co-mingled in the fuel tanks of the aircraft. Absent this key requirement, there would have been insurmountable quality control, logistics, infrastructure and supply chain issues.

GAMI addressed these concerns with its G100UL avgas product, which is a complete solution that meets the essential requirements of any replacement for aviation gasoline. G100UL avgas can be mixed with 100LL in any proportion, and is compatible with the existing fuel infrastructure without modification, enabling its immediate adoption into the marketplace and seamless transition from 100LL. In addition, G100UL avgas can be produced both by current fuel producers in the industry or within the specialty chemical processing industry, helping to maintain a competitive cost structure and widespread availability using the existing avgas distribution infrastructure.

George Braly, head of engineering at GAMI, said, “In 2009, GAMI first filed an application with the FAA for supplemental type certificates allowing the use of a newly-developed fuel chemistry for an unleaded high-octane aviation gasoline. Now, after more than a decade of further development, and fundamental research into fuel chemistries and the technology to accurately measure detonation intensity levels in different fuel chemistries, we are excited that the FAA has issued the initial Approved Model List STCs for use of G100UL high-octane unleaded avgas.”

Tim Roehl, GAMI president, said, “The FAA approval of G100UL high octane unleaded avgas is a truly huge development for the future of general aviation! GAMI and all of its employees have dedicated themselves to this project for over a decade. Now is the time for all of the stakeholders in the general aviation community to stand up and celebrate. These AML-STCs are the ‘beginning of the end’ for the continued use of lead in aviation gasoline.”

Frequent Questions About G100UL Avgas vs. 100LL

Frequent Questions about G100UL Avgas