14 CFR 121.231
§ 121.231 Fuel system lines and fittings.
United States · 14 CFR — Aeronautics and Space · Status: effective
Cite this
- Citation
- 14 CFR 121.231, § 121.231 Fuel system lines and fittings, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/56683
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Full text
(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 airplanes 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 hose must be of an acceptable type or proven suitable for the particular application.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.