C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER I—AIRPORTS › PART 150—AIRPORT NOISE COMPATIBILITY PLANNING › Subpart A—General Provisions

14 C.F.R. § 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 (LA) 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.

Notes of Decisions
Cited in 4 cases, 1985–2002 · leading case: Morongo Band of Mission Indians v. Fed. Aviation Admin. William Withycombe, Reg'l Adm'r, Faa, 161 F.3d 569 (9th Cir. 1998).
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Morongo Band of Mission Indians v. Fed. Aviation Admin. William Withycombe, Reg'l Adm'r, Faa, 161 F.3d 569 (9th Cir. 1998). “In fact, the FAA’s regulations appear to require the use of cumulative data. “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.”
Seattle Cmty. Council Fed'n, a Washington Nonprofit Corp. v. Fed. Aviation Admin. Samuel Skinner, 961 F.2d 829 (9th Cir. 1992). “Neither the CEQ regulations nor the FAA’s own regulations require single-event testing in addition to or in lieu of cumulative testing. In fact, the FAA’s regulations appear to require the use of cumulative data.”
Lucas v. People's Couns. for Baltimore Cnty., 807 A.2d 1176 (Md. Ct. Spec. App. 2002). “The symbol for YDNL is also Ldn." 14 C.F.R.”
Sierra Club v. United States Dep't of Transp., 753 F.2d 120 (D.C. Cir. 1985). “14 C.F.R. § 150.9 (1984). It is clearly within the expertise and discretion of the agency to determine proper testing methods.”
— 14 C.F.R. § 150.9(b) — 1 case
Lucas v. People's Couns. for Baltimore Cnty., 807 A.2d 1176 (Md. Ct. Spec. App. 2002). “The symbol for YDNL is also Ldn." 14 C.F.R.”
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