---
kind: "section"
citation: "14 C.F.R. § 150.9"
title: "14"
number: "150.9"
heading: "Designation of noise systems."
url: "https://uscodex.org/cfr/14/150.9"
---

# §150.9. Designation of noise systems.


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

### Authority

Authority: 49 U.S.C. 106(g), 40113, 44715, 47101, 47501-47504.

### Source

Source: Docket 18691, 49 FR 49269, Dec. 18, 1984, unless otherwise noted.