Source: https://www.law.cornell.edu/cfr/text/14/appendix-A_to_part_150
Timestamp: 2017-09-26 20:23:11
Document Index: 673249645

Matched Legal Cases: ['art 150', 'art 150', 'art_150', 'art 150', 'art 150', 'art 150', '§ 150', '§ 44715', '§ 47101', '§ 47501', '§ 47502', '§ 47503', '§ 47504']

14 CFR Appendix A to Part 150, Noise Exposure Maps | US Law | LII / Legal Information Institute
CFR › Title 14 › Chapter I › Subchapter I › Part 150 › Subpart C › Appendix A_to_part_150
14 CFR Appendix A to Part 150, Noise Exposure Maps
Appendix A to Part 150 - Noise Exposure Maps
Part B - Noise Exposure Map Development
Part C - Mathematical Descriptions
(a)Airport Noise Measurement. The A-Weighted Sound Level, measured, filtered and recorded in accordance with Sec. A150.5 of this appendix, must be employed as the unit for the measurement of single event noise at airports and in the areas surrounding the airports.
(b)Airport Noise Exposure. The yearly day-night average sound level (YDNL) must be employed for the analysis and characterization of multiple aircraft noise events and for determining the cumulative exposure of individuals to noise around airports.
(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. 179, entitled “Precision Sound Level Meters” as incorporated by reference in part 150 under § 150.11. For purposes of this part, the tolerances allowed for general purpose, type 2 sound level meters in IEU 179, are acceptable.
(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. 796, dated 1969, entitled “Measurement of Aircraft Exterior Noise in the Field”; “Handbook of Noise Measurement,” Ninth Ed. 1980, by Arnold P.G. Peterson; or “Acoustic Noise Measurement,” dated Jan., 1979, by J.R. Hassell and K. Zaveri. 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 (LAM); for computation or validation of the yearly day-night average level (Ldn), measurements must be reported in sound exposure level (LAE), as defined in Sec. A150.205 of this appendix.
(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 Ldn contours. Continuous contours must be developed for YDNL levels of 65, 70, and 75 (additional contours may be developed and depicted when appropriate). 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.
(d) For the purpose of compliance with this part, all land uses are considered to be compatible with noise levels less than Ldn 65 dB. Local needs or values may dictate further delineation based on local requirements or determinations.
(3) Noise contours of Ldn 65, 70, and 75 dB resulting from aircraft operations.
(5) Noncompatible land uses within the noise contours, including those within the Ldn 65 dB contours. (No land use has to be identified as noncompatible if the self-generated noise from that use and/or the ambient noise from other nonaircraft and nonairport uses is equal to or greater than the noise from aircraft and airport sources.)
(8) Estimates of the number of people residing within the Ldn 65, 70, and 75 dB contours.
(3) The Ldn 70 dB noise contour and data related to Ldn 70 dB contour. When determinations on land use compatibility using Table 1 differ between Ldn 65-70 dB and the Ldn 70-75 dB, determinations should either use the more conservative Ldn 70-75 dB column or reflect determinations based on local needs and values.
(4) Estimates of the number of people residing within the Ldn 65, 70, and 75 dB contours.
Table 1 - Land Use Compatibility* With Yearly Day-Night Average Sound Levels
Wholesale and retail - building materials, hardware and farm equipment Y Y Y(2) Y(3) Y(4) N
Retail trade - general Y Y 25 30 N N
SLUCM = Standard Land Use Coding Manual.
Y (Yes) = Land Use and related structures compatible without restrictions.
N (No) = Land Use and related structures are not compatible and should be prohibited.
NLR = Noise Level Reduction (outdoor to indoor) to be achieved through incorporation of noise attenuation into the design and construction of the structure.
25, 30, or 35 = Land use and related structures generally compatible; measures to achieve NLR of 25, 30, or 35 dB must be incorporated into design and construction of structure.
(2) Airport activity levels and operational data which will indicate, on an annual average-daily-basis, the number of aircraft, by type of aircraft, which utilize each flight track, in both the standard daytime (0700-2200 hours local) and nighttime (2200-0700 hours local) periods for both landings and takeoffs.
(3) For landings - glide slopes, glide slope intercept altitudes, and other pertinent information needed to establish approach profiles along with the engine power levels needed to fly that approach profile.
(4) For takeoffs - the flight profile which is the relationship of altitude to distance from start-of-roll along with the engine power levels needed to fly that takeoff profile; these data must reflect the use of noise abatement departure procedures and, if applicable, the takeoff weight of the aircraft or some proxy for weight such as stage length.
(a) The airport proprietor shall identify each public agency and planning agency whose jurisdiction or responsibility is either wholly or partially within the Ldn 65 dB boundary.
When a noise environment is caused by a number of identifiable noise events, such as aircraft flyovers, average sound level may be conveniently calculated from the sound exposure levels of the individual events occurring within a time period T:
where LAEi is the sound exposure level of the i-th event, in a series of n events in time period T, in seconds.
When T is one hour, LT is referred to as one-hour average sound level.
where Ldni is the day-night average sound level for the i-th day out of one year.
where to is one second and LA(t) is the time-varying A-weighted sound level in the time interval t1 to t2.
[Doc. No. 18691, 49 FR 49269, Dec. 18, 1984; 50 FR 5064, Feb. 6, 1985, as amended by Amdt. 150-1, 53 FR 8724, Mar. 16, 1988; Amdt. 150-4, 69 FR 57626, Sept. 24, 2004]
§ 44715 - Controlling aircraft noise and sonic boom
§ 47101 - Policies
§ 47501 - Definitions
§ 47502 - Noise measurement and exposure systems and identifying land use compatible with noise exposure
§ 47503 - Noise exposure maps
§ 47504 - Noise compatibility programs