Self-sealing and non-self-sealing fuel cells manufactured under this specification are intended for use in rotorcraft and tilt rotorcraft as a means for carrying aircraft fuel (including aromatic constituents) under all prescribed operating conditions. Additionally, fuel cells manufactured under this specification will be used to prevent, under the gunfire conditions specified herein, an excessive loss of fuel and provide a significant reduction in post crash fires. (It is desired that the service life of a fuel cell covered by this specification be equivalent to that of the aircraft life in which they are installed.)