What was found
DURING FLIGHT AND POST FLIGHT, APPROX 3 MILES OFF THE BEACH, 14 MILES FROM BASE, PILOT ATTEMPTED TO CLOSE WINDOW AND PILOT SLIDING WINDOW POPPED OUT OF TRACK AND DEPARTED THE AIRCRAFT. UPON LANDING AT BASE DURING POST FLIGHT, PILOT DISCOVERED DAMAGE TO ONE OF THE TAIL ROTOR BLADES AND IMMEDIATELY TOLD MAINTENANCE AND LEAD PILOT. MAINTENANCE FOUND ONE TAIL ROTOR BLADE DAMAGED, REMOVED AND REPLACED MAIN INPUT SHAFT, FREE WHEELING UNIT, NR 1 THRU 8 TAIL ROTOR DRIVE SHAFTS, TAIL ROTOR GEAR BOX AND TAIL ROTOR HUB AND BLADES DUE TO SUDDEN STOPPAGE.