# 14 C.F.R. § 36.13 (2026): Acoustical change: Tiltrotor aircraft

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T14_P36_S36_13

## Section

- **Citation:** 14 C.F.R. § 36.13 (2026)
- **Heading:** Acoustical change: Tiltrotor aircraft
- **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 / § 36.13: § 36.13   Acoustical change: Tiltrotor aircraft.

## Text

The following requirements apply to tiltrotors in any category for which an acoustical change approval is applied for under § 21.93(b) of this chapter on or after March 11, 2013:
(a) In showing compliance with Appendix K of this part, noise levels must be measured, evaluated, and calculated in accordance with the applicable procedures and conditions prescribed in Appendix K of this part.
(b) Compliance with the noise limits prescribed in section K4 (Noise Limits) of Appendix K of this part must be shown in accordance with the applicable provisions of sections K2 (Noise Evaluation Measure), K3 (Noise Measurement Reference Points), K6 (Noise Certification Reference Procedures), and K7 (Test Procedures) of Appendix K of this part.
(c) After a change in type design, tiltrotor noise levels may not exceed the limits specified in § 36.1103.
[Amdt. 36-29, 78 FR 1139, Jan. 8, 2013]

## 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_13. Check the current official text before relying on it. Not legal advice.