# 14 CFR § 33.15: Materials

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-14-33.15

## Section

- **Citation:** 14 CFR § 33.15
- **Heading:** Materials
- **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 33—AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES > Subpart B—Design and Construction › General

## Text

The suitability and durability of materials used in the engine must—
(a) Be established on the basis of experience or tests; and
(b) Conform to approved specifications (such as industry or military specifications) that ensure their having the strength and other properties assumed in the design data.
(Secs. 313(a), 601, and 603, 72 Stat. 759, 775, 49 U.S.C. 1354(a), 1421, and 1423; sec. 6(c), 49 U.S.C. 1655(c))
[Amdt. 33-8, 42 FR 15047, Mar. 17, 1977, as amended by Amdt. 33-10, 49 FR 6850, Feb. 23, 1984]

## Nearby sections

- [14 CFR § 33.1 § 33.1 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.1.md)
- [14 CFR § 33.3 § 33.3 General.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.3.md)
- [14 CFR § 33.4 § 33.4 Instructions for Continued Airworthiness.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.4.md)
- [14 CFR § 33.5 § 33.5 Instruction manual for installing and operating the engine.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.5.md)
- [14 CFR § 33.7 § 33.7 Engine ratings and operating limitations.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.7.md)
- [14 CFR § 33.8 § 33.8 Selection of engine power and thrust ratings.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.8.md)
- [14 CFR § 33.11 § 33.11 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.11.md)
- [14 CFR § 33.15 § 33.15 Materials.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.15.md)
- [14 CFR § 33.17 § 33.17 Fire protection.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.17.md)
- [14 CFR § 33.19 § 33.19 Durability.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.19.md)
- [14 CFR § 33.21 § 33.21 Engine cooling.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.21.md)
- [14 CFR § 33.23 § 33.23 Engine mounting attachments and structure.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.23.md)
- [14 CFR § 33.25 § 33.25 Accessory attachments.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.25.md)
- [14 CFR § 33.27 § 33.27 Turbine, compressor, fan, and turbosupercharger rotor overspeed.](https://www.frixlaw.com/law-library/statutes/ecfr-14-33.27.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-14-33.15. Check the current official text before relying on it. Not legal advice.