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...
