# 14 CFR § 36.9: Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-14-36.9

## Section

- **Citation:** 14 CFR § 36.9
- **Heading:** Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes
- **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 C—AIRCRAFT > PART 36—NOISE STANDARDS: AIRCRAFT TYPE AND AIRWORTHINESS CERTIFICATION > Subpart A—General

## Text

For propeller-driven small airplanes in the primary, normal, utility, acrobatic, transport, and restricted categories and for propeller-driven, commuter category airplanes for which an acoustical change approval is applied for under § 21.93(b) of this chapter after January 1, 1975, the following apply:
(a) If the airplane was type certificated under this part prior to a change in type design, it may not subsequently exceed the noise limits specified in § 36.501 of this part.
(b) If the airplane was not type certificated under this part prior to a change in type design, it may not exceed the higher of the two following values:
(1) The noise limit specified in § 36.501 of this part, or
(2) The noise level created prior to the change in type design, measured and corrected as prescribed in § 36.501 of this part.
[Amdt. 36-16, 53 FR 47400, Nov. 22, 1988; 53 FR 50157, Dec. 13, 1988; Amdt. 36-19, 57 FR 41369, Sept. 9, 1992]

## Nearby sections

- [14 CFR § 36.0 § 36.0 Applicability and statements of compliance for aircraft that do not conform to a type certificate.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.0.md)
- [14 CFR § 36.1 § 36.1 Applicability and definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.1.md)
- [14 CFR § 36.2 § 36.2 Requirements as of date of application.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.2.md)
- [14 CFR § 36.3 § 36.3 Compatibility with airworthiness requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.3.md)
- [14 CFR § 36.5 § 36.5 Limitation of part.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.5.md)
- [14 CFR § 36.6 § 36.6 Incorporation by reference.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.6.md)
- [14 CFR § 36.7 § 36.7 Acoustical change: Transport category large airplanes and jet airplanes.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.7.md)
- [14 CFR § 36.9 § 36.9 Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.9.md)
- [14 CFR § 36.11 § 36.11 Acoustical change: Helicopters.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.11.md)
- [14 CFR § 36.13 § 36.13 Acoustical change: Tiltrotor aircraft.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.13.md)
- [14 CFR § 36.101 § 36.101 Noise measurement and evaluation.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.101.md)
- [14 CFR § 36.103 § 36.103 Noise limits.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.103.md)
- [14 CFR § 36.105 § 36.105 Flight Manual Statement of Chapter 4 equivalency.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.105.md)
- [14 CFR § 36.106 § 36.106 Flight Manual statement of Chapter 14 noise level equivalency.](https://www.frixlaw.com/law-library/statutes/ecfr-14-36.106.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-14-36.9. Check the current official text before relying on it. Not legal advice.