Service Bulletin No. 659

STD-33 Plain Washer Replacement

Publications

Service Bulletin No. 659
STD-33 Plain Washer Replacement

February 20, 2025

MODELS AFFECTED

All Lycoming Reciprocating Aircraft Engines

TIME OF COMPLIANCE

At overhaul or at the next maintenance event which requires removal of STD-33 plain washers, whichever occurs first.

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