§ 150.9 Designation of noise systems.
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Title 14 CFR: Aeronautics and Space › Chapter I: FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › Part 150: AIRPORT NOISE COMPATIBILITY PLANNING › Subpart A: General Provisions › § 150.9: § 150.9 Designation of noise systems.
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For purposes of this part, the following designations apply:
(a) The noise at an airport and surrounding areas covered by a noise exposure map must be measured in A-weighted sound pressure level (L
A
) in units of decibels (dBA) in accordance with the specifications and methods prescribed under appendix A of this part.
(b) The exposure of individuals to noise resulting from the operation of an airport must be established in terms of yearly day-night average sound level (YDNL) calculated in accordance with the specifications and methods prescribed under appendix A of this part.
(c) Uses of computer models to create noise contours must be in accordance with the criteria prescribed under appendix A of this part.
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