MIL-DTL-6396F
3.7 Interchangeability. All parts having the same manufacturer's part number shall be
physically and functionally interchangeable without the need for modification of such parts.
3.8 Finish.
3.8.1 External surfaces. The external surfaces of type II and III tanks shall be ozone and
ultraviolet light resistant or protected against the action of ozone, ultraviolet light and the fluid
for which the tanks are intended.
3.8.2 Steel parts. Exposed steel parts shall be of corrosion resistant steel or shall be
protected to satisfy a 120-hour salt fog test conducted in accordance with RTCA/DO-160,
Section 14. For parts not exposed to fuel in normal use, cadmium plating in accordance with
ASTM-B766 may be used. Parts exposed to fuel in normal use shall not be cadmium plated.
3.8.3 Aluminum-alloy parts. Aluminum-alloy parts shall meet a 120-hour salt fog test
conducted in accordance with RTCA/DO-160, Section 14. If required for electrical bonding, the
protection may be removed locally.
3.9 Temperature range. Tanks shall operate throughout an ambient temperature range of
-65 to +160 ºF (-54 to +71 ºC) and fuel temperature ranges of -65 to +135 ºF (-54 to +57 ºC)
unless otherwise directed by the procuring activity.
3.10 Installation torque. As specified by the procuring activity, the proper torque values for
installing the tank in the aircraft and for attachment of fuel lines, interconnects, vent lines, fuel
pumps, valves, access doors, and other fuel system components shall be durably and legibly
marked on or adjacent to each fitting or fuel system component involved, on the side to which
the torque wrench is applied. In tanks where all torque values are the same, the proper torque
value shall be stenciled in a conspicuous space.
3.11 Age. Cells shall be not greater than 2 years old from date of initial cure to delivery to
the procuring activity.
3.12 Cleaning. No cell shall contain rubber particles, dirt, sand, metal chips, welding flux,
or any other foreign material prior to shipment.
3.13 Markings. Each assembly part shall be marked with its part number which shall be the
same as the drawing number of that part or assembly. (An assembly consists of parts that are
permanently fastened together.) Exceptions to this marking requirement are those parts that do
not have a suitable or sufficient surface for a part number.
3.13.1 Location of part numbers. The part number shall be visible to read after assembly of
the complete unit and legible during the life of the part.
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