RV8JD
Well Known Member
Well this is an interesting development, from AvWeb. From the article, it seems that UND had a good monitoring program in place, and is working with Lycoming to evaluate the data and parts.
"Citing Valve Damage, UND Drops Unleaded Fuel And Returns To 100LL"
OTOH, later in the article (but no mention of their maintenance monitoring system):
"Citing Valve Damage, UND Drops Unleaded Fuel And Returns To 100LL"
"After an extensive trial, the University of North Dakota’s flight school has dropped Swift UL94 fuel and resumed use of 100LL. The school said ongoing maintenance monitoring of aircraft using UL94—almost exclusively Lycoming-powered Piper Archers and Seminoles—resulted in measurable exhaust valve recession. The school made the switch back to 100LL on Oct. 27.
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OTOH, later in the article (but no mention of their maintenance monitoring system):
"Another operator we’ve been monitoring for more than two years is Rabbit Aviation Services in San Carlos, California. The company oversees maintenance and fueling of a pair of flying clubs totaling nearly 10,000 hours of flight per year. Rabbit CEO Dan DeMeo said experience with UL94 has been universally positive with less spark plug fouling and cleaner oil. Rabbit has been offering UL94 for two and a half years."
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