MIL-T-5578C, MILITARY SPECIFICATION: TANK, FUEL, AIRCRAFT, SELF-SEALING (31 JUL 1963) [S/S BY MIL-DTL-5578D]., This specification covers self-sealing and partially self-sealing fuel tanks for use on aircraft. A tank shall consist of a cell or group of cells interconnected, and the components attached directly thereto, to form a complete tank or reservoir.