Lycoming Set for ASTM D7547 UL 91 Unleaded Avgas Approval

Lycoming's UL 91 approval will be announced via release of Lycoming Service Instruction 1070R.

About Lycoming
Lycoming Engines specializes in engineering, manufacture, service and support of piston aircraft engines. Headquartered in Williamsport, Pennsylvania, Lycoming piston engines power more than half of the world's general aviation fleet - both rotary-wing and fixed-wing. Lycoming Engines is a division of Avco Corporation. More information is available at

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