Special forms of flight. II: helicopters.
D000060:Accidents, Aviation; D000337:Aerospace Medicine; D000401:Aircraft; D003142:Communication; D005221:Fatigue; D006801:Humans; D009624:Noise, Transportation; D009949:Orientation / Q000502:physiology; D014732:Vibration / Q000009:adverse effects; D014785:Vision, Ocular; D014947:Wounds and Injuries / Q000517:prevention & control