What was found
(CAN) JUST AFTER TAKEOFF THE PILOT OBSERVED AN UN-COMMANDED REDUCTION OF ENGINE POWER TO CLIMB SETTINGS. UPON THE RETURN APPROACH TO THE AIRPORT THE POWER WAS REDUCED THEN FOUND TO BE UNRESPONSIVE TO POWER LEVER COMMANDS. THE AIRCRAFT LANDED SAFELY, TAXIED TO THE TERMINAL AND SHUT DOWN.MAINTENANCE PERSONNEL ATTEMPTED A GROUND START, REVEALING THE ENGINE WOULD NOT ACCELERATE PAST 31% NG WITH A STABILIZED ITT OF 585 DEGREES C. TESTING OF THE FUEL CONTROL UNIT IS BEING CARRIED OUT BY WOODWARD AT THE PRATT & WHITNEY PLANT IN MONTREAL, WITH REPS FROM PILATUS BUSINESS AIRCRAFT USA AND TSB CANADA.REF. SB 13341 AND SB 14305