What was found
(CAN) REDUCTION GEARBOX (RGB) WAS SENT FOR INSPECTION AND REPAIR AFTER THE OPERATOR REPORTED THE RGB WAS MAKING M50 METAL. INVESTIGATION FOUND THE RGB WAS MAKING METAL DUE TO FRACTURING AND SPALLING OF THE INNER RACE OF THE NR 15 BEARING. THE FAILURE APPEARS TO HAVE INITIATED WITH THE FRACTURE THROUGH THE INNER RACE OF THE NR 15 BEARING. THERE IS NO EVIDENCE OF WHY THE INNER RACE FRACTURED, HOWEVER, IT APPEARS LIKELY THAT THIS WAS THE PRIMARY FAILURE OF THE NR 15 BEARING. PART TC: 17,197.