MIL-DTL-5578D
3.5.2 Fabric ply. Fuel cells shall be so fabricated that the seam on any fabric ply shall not be
superimposed with parallel seams of any adjacent fabric ply.
3.5.3 Sealant. The fuel cells shall use an approved sealant processed to meet the
requirements of this specification. The sealant shall be free of foreign matter, and the thickness
shall agree with the approved construction within the established manufacturing tolerance as
described in the manufacturer's specifications.
3.5.4 Fittings. All fittings used in self-sealing fuel cells shall conform to MIL-F-5577. All
flanges of the fitting shall be bonded to the cell. Every effort shall be made to utilize fittings in a
single plane. Where the aircraft design necessitates the use of double plane fittings, particular
care shall be taken to provide adequate exterior flange area to ensure satisfactory adhesive
strength under all conditions of operation. The use of through bolts is prohibited.
3.5.4.1 Screw threads. Screw threads shall be in accordance with SAE-AS8879. The use of
pipe threads is prohibited.
3.6 Performance. The cells and tanks or specified parts thereof shall meet the requirements
specified herein when subjected to the following tests, as specified in Section 4:
a. Inspection (4.5.1)
b. Stand (4.5.2)
c. Dissection (4.5.3)
d. Inner-layer Ply (4.5.4)
e. Test cubes (cells) (4.5.5)
f. Installation (4.5.6)
g. Capacity (4.5.7)
h. Pressure (4.5.8)
i. Slosh or Slosh and Vibration Resistance (4.5.9)
j. Dissection after slosh (4.5.13)
k. Accelerated Load Resistance (4.5.14)
l. Gunfire resistance on tank installation (4.5.15)
3.6.1 Operating temperature. The self-sealing fuel cell shall operate throughout the
temperature range of -40 to 160 °F (-40 to 71 °C) insofar as self-sealing performance is
concerned. For all other operating conditions, the cell shall operate throughout the temperature
range of -65 to 160 °F (-54 to 71 °C) or as directed by the procuring activity.
3.7 Weight. The weight of production cells shall be within 5 percent of the average weight
of the first 10 production cells.
3.8 Finish. Finishes shall meet the requirements of MIL-DTL-6396, Type II or Type III.
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