# 14 CFR § 150.9: Designation of noise systems

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-14-150.9

## Section

- **Citation:** 14 CFR § 150.9
- **Heading:** Designation of noise systems
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 14—Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER I—AIRPORTS > PART 150—AIRPORT NOISE COMPATIBILITY PLANNING > Subpart A—General Provisions

## Text

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.

## Nearby sections

- [14 CFR § 150.1 § 150.1 Scope and purpose.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.1.md)
- [14 CFR § 150.3 § 150.3 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.3.md)
- [14 CFR § 150.5 § 150.5 Limitations of this part.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.5.md)
- [14 CFR § 150.7 § 150.7 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.7.md)
- [14 CFR § 150.9 § 150.9 Designation of noise systems.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.9.md)
- [14 CFR § 150.11 § 150.11 Identification of land uses.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.11.md)
- [14 CFR § 150.13 § 150.13 Incorporations by reference.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.13.md)
- [14 CFR § 150.21 § 150.21 Noise exposure maps and related descriptions.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.21.md)
- [14 CFR § 150.23 § 150.23 Noise compatibility programs.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.23.md)
- [14 CFR § 150.31 § 150.31 Preliminary review: Acknowledgments.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.31.md)
- [14 CFR § 150.33 § 150.33 Evaluation of programs.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.33.md)
- [14 CFR § 150.35 § 150.35 Determinations; publications; effectivity.](https://www.frixlaw.com/law-library/statutes/ecfr-14-150.35.md)

---

Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-14-150.9. Check the current official text before relying on it. Not legal advice.