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Electronic Code of Federal Regulations
Title 14: Aeronautics and Space
§121.229 Location of fuel tanks.
(a) Fuel tanks must be located in accordance with §121.255.
(b) No part of the engine nacelle skin that lies immediately behind a major air outlet from the engine compartment may be used as the wall of an integral tank.
(c) Fuel tanks must be isolated from personnel compartments by means of fume- and fuel-proof enclosures.