What was found
DURING 100 HOUR INSPECTION CLUTCH (PN 369A5350-51) WAS REMOVED FOR SERVICE. LOCK WASHER (PN369A5358) WAS FOUND TO HAVE CRACKED IN 3 PLACES, THIS ALLOWED THESE FRAGMENTS TO SLING OUT FROM THE CLLUTCH WHICH TURNS AT 6200 RPM AND RIDE AGAINST THE INTERIOR OF THE CLUTCH SUPPORT HOUSING (PN 369A5351). THE LOCK WASHER FRAGMENTS CUT A GROOVE .7500 OF THE TOTAL WALL THICKNESS OF THE HOUSING AWAY. THIS IMBALANCE CAUSED THE CARRIER BEARING (PN 369A5361 TO BE OUT OF BALANCE AND IT REQUIRED REPLACEMENT. THE LOCKWASHER WAS REPLACED 181.9 HOURS PRIOR TO FAILURE DURING A SCHEDULED 300 HOUR CLUTCH INSPECTION.