14 C.F.R. § 121.235 Fuel valves.
Title 14 - Aeronautics and Space
Each fuel valve must— (a) Comply with §121.257; (b) Have positive stops or suitable index provisions in the “on” and “off” positions; and (c) Be supported so that loads resulting from its operation or from accelerated flight conditions are not transmitted to the lines connected to the valve.
Title 14: Aeronautics and Space
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
Subpart J—Special Airworthiness Requirements
§ 121.235 Fuel valves.
