What was found
(CAN) WHILE INVESTIGATING A REPORT OF THE PROPELLER GROUND IDLE BEING POSSIBLY OUT OF ADJUSTMENT. THE PROPELLER BETA BLOCK WAS NOTED TO HAVE WORN UNEVEN WHICH RESULTED IN THE METAL RETAINER OF THE CARBON BLOCK TO MAKE CONTACT ONTO THE METAL PROPELLER BETA RING RESULTING IN GROVES TO THE BETA RING AND PARTIAL WEAR OF THE BLOCK HOUSING. THE BETA BLOCK PIVOT WAS FOUND TO HAVE SEIZED IN THE ENGINE BETA FEEDBACK ARM WHICH RESULTED IN BINDING AND A COCKED ALIMENT DURING PROPELLER OPERATION. THE BETA BLOCK ASSY WAS REPLACED AND THE PROPELLER WAS REMOVED FOR REPAIRS TO THE SLIP RING.