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An often overlooked area ofhelmet-mounted display (HMD) design is that of good human factors engineering. Systems which pass bench testing with flying colors can often fmd less enthusiastic acceptance during fielding when good human factors engineering principles are not adhered to throughout the design process. This paper addresses lessons learned on the fielding ofthe AH-64 Apache Integrated Helmet and Display Sight System (IHADSS) and the Aviator's Night Vision Imaging System (ANVIS). These lessons are used to develop guidance for future HMDs in such diverse areas as: user adjustments, anthropometry, fit and comfort, manpower and personnel requirements, and equipment compatibility.
In order to conduct helmet-mounted display (HMD) helicopter research flights in daylight, two versions ofa simulated degraded visual environment (SDVE) were developed. SDVE-l consisted ofa tailored fire-retardant black cloth hood that is draped over the pilot's helmeted head and ventilated with a standard personal ventilator. While SDVE-1 successfully eliminated troublesome reflections, improved display readability, and was reasonably comfortable, pilots reported disturbing sensations of sensory deprivation and isolation. SDVE-2 combined colored filters on the hood and helicopter windscreen to allow the pilot a view of the cockpit interior while blocking light from the external environment. This system has been well accepted and has facilitated safe in-flight HMD research. Motion sickness remains an issue in HMD flight performance research.
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