Unleaded Avgas operator reverting back to leaded fuel
The University of North Dakota (UND) – which operates one of the largest flight training fleets in the US – has reported valve seat recession issues in some Lycoming engine powerplants installed in its training aircraft following its switchover from leaded to unleaded Avgas. UND undertook the change from leaded Avgas (100LL) to Swift Fuels’ unleaded Avgas (UL94) in June 2023 and by October last year had logged some 46,000 flying hours...
100 octane unleaded fuel gains blanket FAA approval
The search for an unleaded replacement to 100LL aviation fuel could finally be over following the US Federal Aviation Administration’s (FAA) signing on 01 September of a supplemental type certificate (STC) that allows General Aviation Modifications Inc.’s (GAMI) 100-octane unleaded aviation fuel (G100UL) to be used in every GA piston engine and every airframe powered by those engines. The move has been hailed by the aviation industry...
