What was found
PROP ASSEMBLY REMOVED FOR A REPORTED VIBRATION. FURTHER INSPECTION REVEALED MOVEMENT WAS NOTED OUTBOARD OF THE COUNTER WEIGHT ASSEMBLY ON ALL FOUR BLADES. THIS MOVEMENT WAS DEEMED UNSERVICEABLE PER DOWTY CM 61-10-36 CHECK SECTION PG 501-506. ASSEMBLY WAS DISASSEMBLED FOR SHIPMENT TO DOWTY AEROSPACE AVIATION SERVICES FOR FURTHER INSPECTION AND OVERHAUL. AFTER DISASSEMBLY OIL WAS FOUND IN THE HUB AREA. S/D - THE REPORTED DISCREPANCY WAS VERIFIED BY THE SERVICE SHOP AND DETERMINDED TO BE THE RESULT OF A WORN SEAL GROOVE IN THE HUB AND WEAR BEYOND MANUAL LIMITS IN THE BLADE INNER SLEEVES. (M)