---
kind: "section"
citation: "14 C.F.R. § 29.619"
title: "14"
number: "29.619"
heading: "Special factors."
url: "https://uscodex.org/cfr/14/29.619"
---

# §29.619. Special factors.

- (a) The special factors prescribed in [§§ 29.621 through 29.625](/cfr/14/29.621..29.625.md) apply to each part of the structure whose strength is—
  - (1) Uncertain;
  - (2) Likely to deteriorate in service before normal replacement; or
  - (3) **Subject to appreciable variability due to—**
    - (i) Uncertainties in manufacturing processes; or
    - (ii) **Uncertainties in inspection methods.**
- (b) For each part of the rotorcraft to which [§§ 29.621 through 29.625](/cfr/14/29.621..29.625.md) apply, the factor of safety prescribed in [§ 29.303](/cfr/14/29.303.md) must be multiplied by a special factor equal to—
  - (1) The applicable special factors prescribed in [§§ 29.621 through 29.625](/cfr/14/29.621..29.625.md); or
  - (2) Any other factor great enough to ensure that the probability of the part being understrength because of the uncertainties specified in [paragraph (a)](#a) of this section is extremely remote.

## Notes

### 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.