Operators and Original Equipment Manufacturers have reported instances of un-commanded engine shutdowns on aircraft equipped with Lycoming IO-360 engines and AVStar manufactured vertical and horizontal mounted fuel servos when the throttle was reduced to idle (hereinafter “rollbacks” or “rollback events”).
These events have been reported on production and in-service Cessna 172S and 172R as well as the Piper Archer III, Pilot 100i, and Seminole aircraft having IO-360 engines. The FAA is asking operators and maintainers of aircraft with IO-360 engines for information if they have experienced similar issues on their aircraft, regardless of fuel servo manufacturer or installation orientation.
https://www.faasafety.gov/files/notices/2025/Dec/2025-12-16_ACS_IO-360_engine_rollbacks.pdf
