Service Letter No. 258

Part Number Supersedure for External Retaining Ring


August 27, 2013 

To all Lycoming Engine Owners, Operators, and Authorized Lycoming  Distributors

This Service Letter is to advise customers, operators and authorized Lycoming distributors that External  Retaining  Ring P/N  MS16624­37 is superseded by P/N MS16624­2037 External Retaining Ring  (zinc coated).

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