Swift Fuels is now commercializing an Unleaded UL94 Avgas in the US and Canada for lower-octane piston engines to begin the industry-wide transition away from 100LL (leaded) avgas.
This proprietary unleaded fuel formulation is a blend of hydrocarbons designed to meet the fuel specification standards of ASTM D7592, D7547, and D4814. This fuel is FAA-certified for use in up to 65% of the US piston fleet; up to 100,000 aircraft are already certified to use the fuel based upon existing Type Certificates and/or Autogas STC’s. An additional 25,000+ aircraft, those whose engines are rated for minimum Grade 91/96 Avgas, are eligible to purchase an FAA Supplemental Type Certificate (STC) for the use of Unleaded UL94 Avgas.
Swift Fuels’ Unleaded UL94 Avgas is made of the same base hydrocarbon components as 100LL, without the addition of tetraethyl lead. Therefore, there is no impact on compatibility with the existing distribution supply chain infrastructure or engine/aircraft fuel systems. There are NO HARDWARE MODIFICATIONS required to use Unleaded UL94 Avgas in any aircraft with an engine rated at 94 Motor octane or lower. Unleaded UL94 Avgas meets or exceeds the minimum octane requirements of many of the engines manufactured by Lycoming, Continental, and Rotax.
Lower Deposits; Less Engine Wear and Tear; Longer TBO’s
Swift Fuels has also conducted endurance testing and dimensional analysis on our Unleaded UL94 Avgas versus 100LL on our engine test stand. Results show increased spark plug life, overall decreased engine wear and tear, significantly decreased deposit build-up, and no acidic corrosion compared to what was observed with 100LL.