# 14 C.F.R. § 36.9 (2026): Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_9

## Section

- **Citation:** 14 C.F.R. § 36.9 (2026)
- **Heading:** Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 14 CFR: Aeronautics and Space / Chapter I: FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION / Part 36: NOISE STANDARDS: AIRCRAFT TYPE AND AIRWORTHINESS CERTIFICATION / Subpart A: General / § 36.9: § 36.9   Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes.

## 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 C.F.R. § 36.0 (2026) § 36.0   Applicability and statements of compliance for aircraft that do not conform to a type certificate.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_0.md)
- [14 C.F.R. § 36.1 (2026) § 36.1   Applicability and definitions.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_1.md)
- [14 C.F.R. § 36.2 (2026) § 36.2   Requirements as of date of application.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_2.md)
- [14 C.F.R. § 36.3 (2026) § 36.3   Compatibility with airworthiness requirements.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_3.md)
- [14 C.F.R. § 36.5 (2026) § 36.5   Limitation of part.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_5.md)
- [14 C.F.R. § 36.6 (2026) § 36.6   Incorporation by reference.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_6.md)
- [14 C.F.R. § 36.7 (2026) § 36.7   Acoustical change: Transport category large airplanes and jet airplanes.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_7.md)
- [14 C.F.R. § 36.9 (2026) § 36.9   Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_9.md)
- [14 C.F.R. § 36.11 (2026) § 36.11   Acoustical change: Helicopters.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_11.md)
- [14 C.F.R. § 36.13 (2026) § 36.13   Acoustical change: Tiltrotor aircraft.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_13.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_9. Check the current official text before relying on it. Not legal advice.