What was found
(CAN) PROPELLER ASSY WAS REMOVED BY CUSTOMER FOR SCHEDULED ENGINE CHANGE. PROPELLER ASSY WAS VISUALLY INSPECTED AND FOUND A WARPED OUTER RING - PROPELLER WAS SENT TO AN APPROVED PROPELLER FACILITY FOR EVALUATION. SLIP RING WAS INSPECTED AND FOUND ALL WITHIN LIMITS EXCEPT THAT THE OUTER RING WAS WARPED OUT WHICH RENDERED IT AS SCRAPPED. REMOVED FROM SERVICE. SLIP RING HAS MISSING RESIN WHICH IS MOLDED IN BETWEEN THE 3 RINGS AND IT HAS FALLEN OUT! THE RESIN KEEPS THE RINGS SPACED CORRECTLY AND PREVENTS WARPAGE. SLIP RING WAS PREVIOUSLY MACHINED AND IS ABOVE MINIMUM THICKNESS ALLOWANCES.