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acci air speed air traffic control aircraft aircraft accident aircraft commander airfield altitude approach armed helicopter Army aircraft Army Aviation School autorotation avia AVIATION DIGEST cause cockpit combat copilot copter craft crash crew chief crew members damage Danny's answer dent designed ejection seat engine equipment factors failure feet fire fixed wing flight plan flight surgeon flying fuel gear ground ground resonance heli helicopter helmet hover Hunter AAF instrument landing load machine guns main rotor maintenance major ment midair collisions mishaps mission Murphy's Law Nomex officer operations percent performance personnel pilot problem procedures radio Republic of Vietnam result rocket Rocket Jet rotary wing rotor blades Rucker runway safety survival tail rotor takeoff tion torque turn U. S. Army Aviation unit USABAAR Vietnam weapons weather