Helicopter Water Impact After Engine Power Loss (N5695D)

Incident Overview and Pilot Report A helicopter struck water while in an autorotation after the pilot reported a loss of engine power during the initial climb. The pilot brought the aircraft down upright approximately 75 feet from the shore, where it came to rest in about 2-1/2 feet of water. ## Post-Accident Inspection An examination of the helicopter confirmed continuity of the flight controls. Both fuel tanks were found to contain 25 gallons of fuel, and the engine contained 8 quarts of oil. The main and tail rotors also showed drivetrain continuity. ## Mechanical Findings Inspectors found a large hole in the crankcase near the number one engine cylinder, with the number one connecting rod protruding from the opening. Examination of the broken connecting rod cap revealed fracture features consistent with a fatigue-type failure. In addition, the material around the fatigue initiation point was galled, as were several other areas of the bearing interface.