What was found
(CAN) TORQUE FLUCTUATIONS/IFSD DURING CRUISE, THE CREW STARTED TO READ FLUCTUATING ENGINE SPEED AND TORQUE INDICATIONS. THEY ELECTED TO SHUT THE ENGINE DOWN AS A PRECAUTIONARY MEASURE. THE FLIGHT CONTINUED TO IT`S DESTINATION AND AN UNEVENTFUL SINGLE-ENGINE LANDING TOOK PLACE. MAINTENANCE FOUND A SHEARED FUEL CONTROL (FCU) DRIVE SHAFT TO BE THE ROOT CAUSE OF THE EVENT. AN OVERHAUL FCU WAS INSTALLED AND THE AIRCRAFT WAS RETURNED INTO SERVICE. DEFECTIVE FCU TO BE SEND TO HONEYWELL IN PEI FOR REPAIR. P&WC WILL INVESTIGATE TO ESTABLISH ROOT CAUSE AND SUPPLEMENT THE REPORT ONCE THE INFORMATION IS AVAILABLE.