14 CFR · Part 121
14 CFR § 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.
Regulations Referenced
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
Primary Source