Service Bulletin No. 642
Incorrect Piston and Ring Combination
March 22, 2020
O-235-C, E & H series, and Factory Cylinder Kit P/N 05K23039
TIME OF COMPLIANCE
Within the next 10 hours of operation or next scheduled maintenance event, whichever occurs first.
Service Bulletin as a result of COS-3031 investigation from reports of incorrect piston and rings found in 05K23039 cylinder kits.
Product Support Network
Wherever you are in the world, you have access to exceptional expertise and knowledge about Lycoming engines. Get the most comprehensive customer service and support in the general aviation industry.
Get It Exchanged
Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.