What was found
PROPELLER SERIAL NUMBER HL-146, WAS REMOVED FROM AIRCRAFT N331MX (S/N 3067) FOR SCHEDULED MAINTENANCE. WHEN THE PROPELLER WAS BEING DISASSEMBLED IN PREPARATION FOR SHIPMENT TO THE OEM FOR INSPECTION, MAINTENANCE PERSONNEL NOTICED THE THRUST BEARING AT THE NR 3 BLADE POSITION WAS SPLIT INTO ALONG THE ENTIRE LENGTH OF THE CIRCUMFERENCE OF THE BEARING. THE OEM WAS NOTIFIED OF OUR FINDINGS. THE OEM HAS A PROGRAM IN PLACE TO REPLACE THESE BEARINGS WHEN THE PROPELLER UNDERGOES THE FIRST INSPECTION AT 2100 FLIGHT CYCLES.