---
kind: "section"
citation: "14 C.F.R. § 25.905"
title: "14"
number: "25.905"
heading: "Propellers."
url: "https://uscodex.org/cfr/14/25.905"
---

# §25.905. Propellers.

- (a) Each propeller must have a type certificate.
- (b) Engine power and propeller shaft rotational speed may not exceed the limits for which the propeller is certificated.
- (c) The propeller blade pitch control system must meet the requirements of §§ [35.21](/cfr/14/35.21.md), [35.23](/cfr/14/35.23.md), [35.42](/cfr/14/35.42.md) and [35.43](/cfr/14/35.43.md) of this chapter.
- (d) Design precautions must be taken to minimize the hazards to the airplane in the event a propeller blade fails or is released by a hub failure. The hazards which must be considered include damage to structure and vital systems due to impact of a failed or released blade and the unbalance created by such failure or release.

## Notes

### Amendments

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-54, 45 FR 60173, Sept. 11, 1980; Amdt. 25-57, 49 FR 6848, Feb. 23, 1984; Amdt. 25-72, 55 FR 29784, July 20, 1990; Amdt. 25-126, 73 FR 63345, Oct. 24, 2008]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702 and 44704; Pub. L. 115-254, 132 Stat 3281 (49 U.S.C. 44903 note).

### Source

Source: Docket No. 5066, 29 FR 18291, Dec. 24, 1964, unless otherwise noted.

### Amendments

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-54, 45 FR 60173, Sept. 11, 1980; Amdt. 25-57, 49 FR 6848, Feb. 23, 1984; Amdt. 25-72, 55 FR 29784, July 20, 1990; Amdt. 25-126, 73 FR 63345, Oct. 24, 2008]