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is to advise customers, operators and authorized Lycoming distributors that External Retaining Ring P/N MS1662437 is superseded by P/N MS166242037 External Retaining Ring (zinc coated).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