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|  MIL-T-6396E
Fuel cubes shall be subjected to low and normal
4.6.19.1 Gunfire tests.
temperature gunfire tests. Oil cubes shall be subjected only to a normal
temperature gunfire test.
4.6.19.1.1 Low temperature gunfire (fuel cube).
The first fuel cube shall be
sloshed as specified in 4.6.8. Then the fuel shall be removed and the cube air
0
dried at a temperature of 155 F + 5F (68C + 3C) for a period of 48 hours. The
cube shall then be filled three-fourths-full with TT-S-735, type I fluid or
with a fluid of comparable specific gravity and which is satisfactory to the
contractor of the acquisition activity. The tank and liquied shall then be so
cooled that, at the time of firing, the temperature of the fluid and the cube
will be -40F + 5F (-40C + 3C).
4.6.19.1.2 Normal temperature gunfire (fuel cube)
The second fuel cube shall
be sloshed as specified in 4.6.8. Then the fuel shall be removed and the cube
0
0
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air dried at a temperature of 155F + 5 F (68 + 3 C) for a period of 48 hours.
The cube shall then be filled with water. The temperature of the water at the
0
time of test shall be 50F to 100F (l0C to 38 C).
4.6.19.1.3 Normal temperature gunfire (oil cube). Oil cubes shall be sloshed
as specified in 4.6.8. The fluid shall be removed. (Hot air drying is not
required.) The cube shall be filled with MIL-L-6082, grade 1100 oil, or a
liquid having camparable 0specific 0gravity. The Otemperature of the fluid at the
O
time of test shall be 50 F to 100 F (l0 C to 38 C).
4.6.19.2 Evaluation
a. The low temperature gunfire test shall produce no larger than a 4-inch-
diameter tear for each entry and exit.
b. The normal temperature gunfire test shall produce no larger than a 3-inch-
diameter tear for each entry and exit.
c. There shall be no tears which do not radiate from the bullet hole which
cannot be accounted for by shrapnel or structure.
4.6.20 Handling (type II tanks only). Prior to installation of the tank or
tanks in the test structure, it shall be folded and unfolded 40 times in
accordance with standard procedure for shipment. The tank or tanks shall then
be installed and removed from the test structure five times. Applicable
service procedures shall be followed in tank installation and removal. All
fittings shall be fastened to corresponding structure and interconnect fittings
upon each installation in the test structure. The tanks shall be in a satis-
factory condition upon completion of these tests and shall pass the leakage
test specified in 4.6.1.5.
4.6.21 Installation. The tank shall be checked in the applicable test
structure. The location of all fittings and the tank dimensions shall be
within the allowable tolerances.
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