What was found
MAIN ROTOR HUB PN: 145R2004-20, SN: A5-223 WAS REMOVED FROM N40CU AT 8721.8 TAFT FOR OVERHAUL. DURING PRELIMINARY STEPS FOR DISASSEMBLY, WHILE DRAINING AND REMOVING ALL THE SAFETY WIRE FROM THE GREEN HORIZONTAL HINGE PIN AND OIL HUB FILL CAP, TOP HALF OF HORIZONTAL HINGE PIN SHAFT BOLT (PN: 1142201-2) HEAD SEPARATED FROM BOLT. PRIOR TO REMOVAL OF SAFETY WIRE, BOLT HEAD WAS HELD IN PLACE BY SAFETY WIRE AND SEALANT. THE REMAINING BOLT APPEARS TO BE HELD IN POSITION BY THE WASHER AND REMAINING BOLT HEAD MATERIAL. THERE APPEARS TO BE CORROSION ON 2 AREAS OF THE SHEARED MATERIAL WITH SOME DISCOLORATION FROM THE CAD PLATING PROCESS.