MIL-DTL-5578D
loss, or other evidence of deterioration. The exterior surface of the cell construction shall show
no unsatisfactory swelling, separation, blistering, material loss, or other deterioration.
4.5.5.2 Slosh resistance. The phase I test cube shall be tested for slosh resistance by
mounting on a rocker assembly and rocking the test cube through an angle of 15 degrees on each
side of the level position (total 30 degrees) at a rate of l8 +2 cycles per minute for a period of 25
hours with the test cube two-thirds full of JP-5 or JP-8 or other test fluid as specified by the
procuring activity. Test cubes that are non-self-supporting shall be installed in a test structure as
shown on figure 3. The fluid shall be maintained at a temperature of 110 °F (43 °C) throughout
the test. The time for the temperature rise to 110 °F (43 °C) from the ambient temperature shall
be not greater than 2 hours. There shall be no evidence of leakage or failure of any kind during
or as a result of this test.
4.5.5.3 Gunfire resistance on phase I test cubes.
4.5.5.3.1 Test setup. Class A test cubes shall be installed in the support structure as directed
by the procuring activity. Class B test cubes shall be tested without auxiliary support. The
temperature shall be measured by a thermometer or thermocouple immersed in the fluid. The
test cubes shall be mounted not greater than 75 feet from the gun. All rounds shall be fired at
service velocity. All entrance rounds shall be fired into the cube space occupied by the fluid. A
non-metallic yaw plate may be used for tumbled entrances.
4.5.5.3.2 Firing schedule. The firing schedule as shown on table I shall be conducted at
ambient temperature on test cube No. 1.
4.5.5.3.2.1 Normal temperature gunfire. The test cube shall be filled three-quarters full of
JP-5 or JP-8 or other test fluid as specified by the procuring activity. The temperature of the
fluid at the time of the test shall be 50 to 120 °F (10 to 49 °C).
4.5.5.3.3 Evaluation. Following gunfire tests, fuel cells shall be examined to ensure the
wound dry or damp seals within 2 minutes at ambient temperature.
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