What was found
(CAN) THE OPERATOR REPORTS THAT THE ENGINE EXPERIENCED AN AUTOFEATHER AND SHUTDOWN DURING FLIGHT. THE CAUSE OF THE SHUTDOWN AND AUTOFEATHER WAS LOSS OF OIL PRESSURE, CAUSED BY A LOSS OF ACCESSORY DRIVE TRAIN INTEGRITY WHICH PROVIDES THE POWER TO THE OIL PUMP. THE ANGLE DRIVE (TOWER SHAFT) WAS FOUND TO HAVE FRACTURED IMMEDIATELY BELOW THE UPPER RETAINING NUT.