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Helicopter Strikes Terrain During External-load Aerial Logging Operation 6 pages. [PDF 74K]
The investigation report said that a fatigue fracture in the main-rotor mast resulted in an in-flight separation of the main rotor from the helicopter.
‘Cardiac Event’ Suspected In Pilot’s Loss of Aircraft Control 4 pages. [PDF 42K]
The investigative report said that ‘some loss of control’ occurred during the final seconds of a charter flight in New Zealand. The cause of the loss of control was not established conclusively, but the report said that the pilot might have experienced ‘the sudden onset of a cardiac event.’
The collisions represented 1.4 percent of all accidents involving helicopters registered in the United States throughout the decade.
More than half the accidents in U.S. helicopter logging operations in 1983 through 1999 involved failures of engines or transmission systems. Metal fatigue and external-load problems also were major causes of accidents.
Helicopter Strikes Wires While Installing Cable on Tower 4 pages. [PDF 41K]
The pilot was maneuvering the helicopter to aid installation of cable on an electric-power transmission tower when a wire strike occurred; the helicopter then began an uncontrolled descent and struck the ground. The pilot was seriously injured,
and a crewmember was killed.
Air Ambulance Strikes Mountain In Heavy Snow and High Winds 4 pages. [PDF 49K]
Witnesses said blizzard conditions existed at a remote rescue site when a Bell 222UT pilot attempted to evacuate a critically injured cross-country skier. The investigation report said that the pilot’s “perception of pressure”
to complete the flight was a factor in the accident.