Piper Service Letter No. 682B
Reference: Lycoming Service Bulletin No. 3670, dated March 8, 1974
Applicability: See attached service letter for affected Lycoming engine models and serial numbers
System: Engine
Issue Date: April 16, 1974
Subject: Required Inspection of Part No. 69650 Piston Pin
Summary: Failure of part number 69650 piston pins, caused by transverse grinding or heat cracks which occurred during manufacture of the piston pin.
Open PDF: PIP_SL682B.pdf