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- W1557202317 abstract "Abstract : A design standard for interior noise of helicopters has been prepared to provide the developer and user with realistic noise limits which consider hearing damage risk, speech intelligibility, mission profile, state-of-the-art in noise reduction, and helicopter weight. The levels selected meet the current hearing conservation limits of the Department of Defense and permit electrically aided sentence intelligibility of 98%. Helicopters below 20,000 pounds are treated separately from those above because of the strong positive relation between internal noise and vehicle gross weight. This standard defines the locations and flight conditions under which noise measurements shall be made for compliance. It also specifies the types of instrumentation and the test procedures to be used to collect interior noise level data. This degree of specificity in the instrumentation and measurements area is intended to insure that data collected by different development and test agencies will be both accurate and consistent. (Author)" @default.
- W1557202317 created "2016-06-24" @default.
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- W1557202317 date "1981-03-01" @default.
- W1557202317 modified "2023-09-27" @default.
- W1557202317 title "The Background and Bases for the Proposed Military Standard on Acoustical Noise Limits in Helicopters." @default.
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