# 14 C.F.R. § 33.25 (2026): Accessory attachments

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_25

## Section

- **Citation:** 14 C.F.R. § 33.25 (2026)
- **Heading:** Accessory attachments
- **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 33: AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES / Subpart B: Design and Construction › General / § 33.25: § 33.25   Accessory attachments.

## Text

The engine must operate properly with the accessory drive and mounting attachments loaded. Each engine accessory drive and mounting attachment must include provisions for sealing to prevent contamination of, or unacceptable leakage from, the engine interior. A drive and mounting attachment requiring lubrication for external drive splines, or coupling by engine oil, must include provisions for sealing to prevent unacceptable loss of oil and to prevent contamination from sources outside the chamber enclosing the drive connection. The design of the engine must allow for the examination, adjustment, or removal of each accessory required for engine operation.
[Amdt. 33-10, 49 FR 6851, Feb. 23, 1984]

## Nearby sections

- [14 C.F.R. § 33.11 (2026) § 33.11   Applicability.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_11.md)
- [14 C.F.R. § 33.15 (2026) § 33.15   Materials.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_15.md)
- [14 C.F.R. § 33.17 (2026) § 33.17   Fire protection.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_17.md)
- [14 C.F.R. § 33.19 (2026) § 33.19   Durability.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_19.md)
- [14 C.F.R. § 33.21 (2026) § 33.21   Engine cooling.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_21.md)
- [14 C.F.R. § 33.23 (2026) § 33.23   Engine mounting attachments and structure.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_23.md)
- [14 C.F.R. § 33.25 (2026) § 33.25   Accessory attachments.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_25.md)
- [14 C.F.R. § 33.27 (2026) § 33.27   Turbine, compressor, fan, and turbosupercharger rotor overspeed.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_27.md)
- [14 C.F.R. § 33.28 (2026) § 33.28   Engine control systems.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_28.md)
- [14 C.F.R. § 33.29 (2026) § 33.29   Instrument connection.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_29.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T14_P33_S33_25. Check the current official text before relying on it. Not legal advice.