§ 183.538. Metallic fuel line materials.
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/us/cfr/t33/s§ 183.538·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
Each metallic fuel line connecting the fuel tank with the fuel inlet connection on the engine must:
(a)Be made of seamless annealed copper, nickel copper, or copper-nickel; and
(b)Except for corrugated flexible fuel line, have a minimum wall thickness of 0.029 inches.