March 11, 2015
To All Owners and Operators of Lycoming IO-540-AC1A5 and TIO-540-AJ1A Engine Models
This Service Letter is in response to reports of discolored paint on engine cylinders of IO-540-AC1A5 and TIO-540-AJ1A engine models. Discoloration on an engine cylinder can be the result of the unique engine configuration and the ecologically friendly paint applied to the cylinder at the factory and is not necessarily an indication of heat build-up or other problems that can cause discoloration.
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