What was found
(CAN) PILOT HEARD A LOUD BANG AS HE WAS LOWERING A LOG ONTO LANDING WITH A SLIGHT DROP IN ALTITUDE. THE AIRCRAFT WAS LANDED AND THE MAIN DRIVE SHAFT BETWEEN ENGINE AND TRANSMISSION WAS ROTATED. THE ROTATIONHAD A ROUGH SOUND WHICH WAS REPORTED TO THE AIRCRAFT MANUFACTURER. THE CLUTCH ASSY WAS REMOVED ANDHAD SIGNS OF SPRAG DAMAGE. THE MANUFACTURE RECOMMENDED CHANGING CLUTCH AND INPUT. A MANUFACTURES REPRESENTITIVE IS GOING TO LOOK AT CLUTCH AND INSTALL NEW INPUT. INVESTIGATION BY MANUFACTURER IS CONTINUING. A/F TIME 6504.3 DATE OF OCCURANCE NOV.4/02