![]() When appropriate, noise level reduction through incorporation of sound attenuation into the design and construction of a structure may be necessary to achieve compatibility. If other uses with greater sensitivity to noise are permitted by local government at a site, a determination of compatibility must be based on that use which is most adversely affected by noise. (c) Compatibility designations in Table 1 generally refer to the major use of the site. Adjustments or modifications of the descriptions of the land-use categories may be desirable after consideration of specific local conditions. Compatible or noncompatible land use is determined by comparing the predicted or measured YDNL values at a site with the values given. Any particular level might not, therefore, accurately assess an individual's perception of an actual noise environment. The ranges of YDNL values in Table 1 reflect the statistical variability for the responses of large groups of people to noise. (b) Table 1 of this appendix describes compatible land use information for several land uses as a function of YDNL values. ![]() In those areas where YDNL values are 65 YDNL or greater, the airport operator shall identify land uses and determine land use compatibility in accordance with the standards and procedures of this appendix. Continuous contours must be developed for YDNL levels of 65, 70, and 75 (additional contours may be developed and depicted when appropriate). (a) To determine the extent of the noise impact around an airport, airport proprietors developing noise exposure maps in accordance with this part must develop L dn contours. For purposes of this part, measurements intended for comparison to a State or local standard or with another transportation noise source (including other aircraft) must be reported in maximum A-weighted sound levels (L AM) for computation or validation of the yearly day-night average level (L dn), measurements must be reported in sound exposure level (L AE), as defined in Sec. Peterson or “Acoustic Noise Measurement,” dated Jan., 1979, by J.R. 796, dated 1969, entitled “Measurement of Aircraft Exterior Noise in the Field” “Handbook of Noise Measurement,” Ninth Ed. (b) Noise measurements and documentation must be in accordance with accepted acoustical measurement methodology, such as those described in American National Standards Institute publication ANSI 51.13, dated 1971 as revised 1979, entitled “ANS-Methods for the Measurement of Sound Pressure Levels” ARP No. For purposes of this part, the tolerances allowed for general purpose, type 2 sound level meters in IEU 179, are acceptable. 179, entitled “Precision Sound Level Meters” as incorporated by reference in part 150 under § 150.11. (a) Sound levels must be measured or analyzed with equipment having the “A” frequency weighting, filter characteristics, and the “slow response” characteristics as defined in International Electrotechnical Commission (IEC) Publication No. A150.5 Noise measurement procedures and equipment. Whenever noise monitoring is used, under this part, it should be accomplished in accordance with Sec. Noise monitoring may be utilized by airport operators for data acquisition and data refinement, but is not required by this part for the development of noise exposure maps or airport noise compatibility programs. (b) This appendix provides for the use of the FAA's Integrated Noise Model (INM) or an FAA approved equivalent, for developing standardized noise exposure maps and predicting noise impacts. It also identifies land uses which, for the purpose of this part are considered to be compatible with various exposures of individuals to noise around airports. That methodology includes a single system of measuring noise at airports for which there is a highly reliable relationship between projected noise exposure and surveyed reactions of people to noise along with a separate single system for determining the exposure of individuals to noise. ![]() (a) This appendix establishes a uniform methodology for the development and preparation of airport noise exposure maps. ![]() MHRA 'DNL', All Acronyms, 10 September 2023, Bluebook All Acronyms, DNL (Sep. DNL, All Acronyms, viewed September 10, 2023, MLA All Acronyms. Retrieved September 10, 2023, from Chicago All Acronyms. Facebook Twitter Linkedin Quote Copy APA All Acronyms. ![]()
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