Evaluation of Effective Parameters in Design, from Environmental and Operational Point of View, on Helicopter Aviation Accidents

Helicopter as one of the main regional aerial transportation vehicles that need no special place for takeoff and landing، is one of the main elements of regional and national transportation system. But types of accidents that cause helicopter crash are more complicated than aircraft. This is because of that helicopters division from class point of view، mission، used systems and type of accident is not the same among helicopter producers. Thus helicopters accident investigation is essential. In this paper 9210 accidents، occurred during 1962 to 2004، are investigated considering effective subsets in design، from environmental and operational point of view، and their effect on fleet design. Investigated viewpoints are probable cause، contributing factor، phase of operation، first symptom، weather conditions - wind speed and direction and weight effects in accidents. Thus it is tried that effective factors in accidents be sorted by design conception.