---
kind: "section"
citation: "14 C.F.R. § 25.619"
title: "14"
number: "25.619"
heading: "Special factors."
url: "https://uscodex.org/cfr/14/25.619"
---

# §25.619. Special factors.


The factor of safety prescribed in [§ 25.303](/cfr/14/25.303.md) must be multiplied by the highest pertinent special factor of safety prescribed in [§§ 25.621 through 25.625](/cfr/14/25.621..25.625.md) for each part of the structure whose strength is—

- (a) Uncertain;
- (b) Likely to deteriorate in service before normal replacement; or
- (c) Subject to appreciable variability because of uncertainties in manufacturing processes or inspection methods.

## Notes

### Amendments

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-23, 35 FR 5674, Apr. 8, 1970]

### 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. 25-23, 35 FR 5674, Apr. 8, 1970]