StacksVerified U.S. regulatory reference

14 CFR §150.9

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
For purposes of this part, the following designations apply:
  1. (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.
  2. (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.
  3. (c)Uses of computer models to create noise contours must be in accordance with the criteria prescribed under appendix A of this part.