The requirements for and testing of an Integrated Helmet System (IHS) for helicopter application are presented. An IHS consists of a helmet shell, a Helmet Mounted Sight (HMS), two Image Intensifier Tubes (IIT) and two Cathode Ray Tubes (CRT) with an optical system including combiners to present the images binocular. Additional symbology can be superimposed to the CRT or IIT image. The HMS can steer a sensor platform with a thermal camera or an air to air missile system. The main helicopter requirements on such a system are: human factors; fit of helmet including optimized center of gravity and weight; optimized day, twilight and night optical modules; large exit pupil, good transmission of the optical path and a large adjustment range; good geometrical resolution/modulation transfer function with a large field of view; high focussing range of the IIT; CRT automatic brightness and contrast control with a good readability in day time; flight symbology presentation for one or two eyes; good static and dynamic HMS accuracy with a large head motion box; NBC (Nuclear, Biological, Chemical) and laser protection compatibility. The results of helicopter flight trials and laboratory tests showed there is no substitute for flight trials to completely understand an IHS for day and night flight capability. The difficult human engineering aspects have to be evaluated with functional IHS models to find the necessary improvements.
Integrated Helmet System Testing for a Nightflying Helicopter
1991
20 pages
Report
No indication
English
Avionics , Aeronautics , Human Factors Engineering , Flight tests , Helicopters , Helmet mounted displays , Human factors engineering , Image intensifiers , Night flights (Aircraft) , Performance tests , Helmets , Cathode ray tubes , Flight clothing , Night vision , Requirements , Systems integration , Foreign technology
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