---
kind: "section"
citation: "14 C.F.R. § 125.129"
title: "14"
number: "125.129"
heading: "Fuel system lines and fittings."
url: "https://uscodex.org/cfr/14/125.129"
---

# §125.129. Fuel system lines and fittings.

- (a) Fuel lines must be installed and supported so as to prevent excessive vibration and so as to be adequate to withstand loads due to fuel pressure and accelerated flight conditions.
- (b) Lines connected to components of the airplane between which there may be relative motion must incorporate provisions for flexibility.
- (c) Flexible connections in lines that may be under pressure and subject to axial loading must use flexible hose assemblies rather than hose clamp connections.
- (d) Flexible hoses must be of an acceptable type or proven suitable for the particular application.

## Notes

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44705, 44710-44711, 44713, 44716-44717, 44722.

### Source

Source: Docket 19779, 45 FR 67235, Oct. 9, 1980, unless otherwise noted.