What was found
(CAN) DURING FLIGHT, WHILE ADJUSTING ENGINE POWER SETTINGS, NOTED RT TORQUE INDICATOR FLUCTUATIONS, THEN RAPID UNCONTROLLED TORQUE INCREASED. ENGINE SHUTDOWN IMMEDIATELY AND UNSCHEDULED LANDING CARRIED OUT. MAINTENANCE FOUND FUEL CONTROL UNIT HAS FAILED INTERNALLY AND SHEARED DRIVE COUPLING.OVERHAUL SHOP TEARDOWN FOUND BEARINGS SEIZED IN FCU.