Federal Aviation Regulations
Sec. 125.127 — Location of fuel tanks.
(a) Fuel tanks must be located in accordance with §125.153.(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.
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