What was found
(CAN) MAIN ROTOR TORQUE CHECK WAS PERFORMED ON M/R MAST NUT BETWEEN 3 TO 8 FLIGHT HOURS IAW THE MM CHAPTER 5, AND MM, SECTION 62-7, PARAGRAPH 5. INITIAL TORQUE CHECK OF MAST NUT TORQUE WAS FOUND BELOW MINIMUM SPECIFIED TORQUE OF 250 FT/LBS, IAW MM. A SUBSEQUENT TORQUE CHECK WAS PERFORMED AFTER SECOND FLIGHT OF 3 HOURS WITH THE SAME RESULTS, MAST NUT TORQUE FALLING BELOW MINIMUM TORQUE VALUE OF 250FT/LBS. UPON VISUAL INSPECTION IN THE AREA OF THE CONE SET TO TRUNNION, IT WAS FOUND THAT ONE OF THE SPLIT CONES HALVES HAD MOVED. THEREFORE DID NOT PROVIDE A TRUE SEAT FOR THE SPLIT CONES TO THE M/R TRUNNION AS CONE SET AND WAS PARTIALLY COCKED. IT IS SUSPECTED THAT EACH OF THE 2 TORQUE CHECK ADJUSTMENTS