December 31, 2014
All Owners and Operators of Lycoming Aircraft Engines
Table 1 of this Service Letter identifies new piston ring part numbers (P/N) that replace existing piston ring part numbers. All of the new piston rings are equivalent to the existing piston rings. Existing and new piston rings can be mixed in the same engine, but be sure to use either all new piston rings in a cylinder or all existing piston rings in a cylinder. Do not mix old and new piston rings on the same cylinder.
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