Baseline Noise Measurements of the OH-58A Helicopter.
HUMAN ENGINEERING LABS ABERDEEN PROVING GROUND MD
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Sound measurements were taken in the OH-58A Kiowa Helicopter under conditions of maximum performance take off and climb, normal cruise, descent and hover both with and without soundproofing installed. Measurements were taken of the noise produced by firing the XM27E1 minigun system. Intelligibility tests of the intercom system and one radio receiver were carried out. Results are presented and compared to Human Engineering Laboratories Standard S-1-63B. Hearing hazard presented by weapon firing is discussed. Author