What was found
RIGHT MAGNETO SHAFT SHEARED. INSPECTION REVEALED DAMAGE TO CRANKSHAFT GEAR TEETH AND TO ACCESSORY HOUSING CAUSED BY MAGNETO DRIVE GEAR ASSEMBLY IMPACTING THE TEETH AND CASE. PILOT DID NOT REPORT ANY SIGNIFICANT ISSUES WITH ENGINE PERFORMANCE DURING CRUISE. A MAGNETO CHECK WAS ACCOMPLISHED PRIOR TO DEPARTURE WITH NOMINAL RESULTS. UPON LANDING, ANOTHER MAG CHECK WAS ACCOMPLISHED PRIOR TO SHUTDOWN AND THE RIGHT MAG DID NOT FUNCTION. WHEN THE MAG WAS REMOVED BY MAINTENANCE PERSONNEL, THE SHAFT WAS NOTED TO BE SHEARED AND THE GEAR AND CUSHION ASSEMBLY, INTACT, WERE RETRIEVED FROM THE ACCESSORY CASE. PHOTOS ARE AVAILABLE. AIRCRAFT/ENGINE IS HANGARED AND AVAILABLE FOR INSPECTION AS IS AFFECTED MAGNETO AND DRIVE GEAR.