22 August 2001 Rotary-wing flight test methods used for the evaluation of night vision devices
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The U.S. Army Aviation mission includes flying helicopters at low altitude, at night, and in adverse weather. Night Vision Devices (NVDs) are used to supplement the pilot's visual cues for night flying. As the military requirement to conduct night helicopter operations has increased, the impact of helicopter flight operations with NVD technology in the Degraded Visual Environment (DVE) became increasingly important to quantify. Aeronautical Design Standard-33 (ADS- 33) was introduced to update rotorcraft handling qualities requirements and to quantify the impact of the NVDs in the DVE. As reported in this paper, flight test methodology in ADS-33 has been used by the handling qualities community to measure the impact of NVDs on task performance in the DVE. This paper provides the background and rationale behind the development of ADS-33 flight test methodology for handling qualities in the DVE, as well as the test methodology developed for human factor assessment of NVDs in the DVE. Lessons learned, shortcomings and recommendations for NVD flight test methodology are provided in this paper.
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Loran A. Haworth, Loran A. Haworth, Christopher J. Blanken, Christopher J. Blanken, Zoltan Peter Szoboszlay, Zoltan Peter Szoboszlay, "Rotary-wing flight test methods used for the evaluation of night vision devices", Proc. SPIE 4361, Helmet- and Head-Mounted Displays VI, (22 August 2001); doi: 10.1117/12.437992; https://doi.org/10.1117/12.437992

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