---
kind: "section"
citation: "14 C.F.R. § 29.625"
title: "14"
number: "29.625"
heading: "Fitting factors."
url: "https://uscodex.org/cfr/14/29.625"
---

# §29.625. Fitting factors.


For each fitting (part or terminal used to join one structural member to another) the following apply:

- (a) For each fitting whose strength is not proven by limit and ultimate load tests in which actual stress conditions are simulated in the fitting and surrounding structures, a fitting factor of at least 1.15 must be applied to each part of—
  - (1) The fitting;
  - (2) The means of attachment; and
  - (3) **The bearing on the joined members.**
- (b) **No fitting factor need be used—**
  - (1) For joints made under approved practices and based on comprehensive test data (such as continuous joints in metal plating, welded joints, and scarf joints in wood); and
  - (2) **With respect to any bearing surface for which a larger special factor is used.**
- (c) For each integral fitting, the part must be treated as a fitting up to the point at which the section properties become typical of the member.
- (d) Each seat, berth, litter, safety belt, and harness attachment to the structure must be shown by analysis, tests, or both, to be able to withstand the inertia forces prescribed in [§ 29.561(b)(3)](/cfr/14/29.561.md?p=b-3) multiplied by a fitting factor of 1.33.

## Notes

### Amendments

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-42, 63 FR 43285, Aug. 12, 1998]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 5084, 29 FR 16150, Dec. 3, 1964, unless otherwise noted.

### Amendments

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-42, 63 FR 43285, Aug. 12, 1998]