MIL-DTL-5578D
a. Vibrate for 25 hours at 16 to 20 slosh cycles per minute (cpm); or
b. Vibrate for 25 hours at 10 to 16 slosh cpm with 15 hours of additional slosh at 10 to
16 slosh cpm.
4.5.11 Vibration (Type I tanks only). A tank shall be tested in accordance with the
procedure specified in 4.5.9.6 or 4.5.9.7, as applicable, except:
a. The tank shall not be sloshed.
b. The tank shall be completely filled with test fluid.
4.5.12 Slosh.
4.5.12.1 Phase I slosh. A test cube (tank) shall be tested in accordance with the procedure
specified in 4.5.9.7 except that this cube shall not be subjected to vibration. The cube shall be
sloshed for at least 25 hours at 16 to 20 cpm. Type II cubes shall be installed in the gun fire test
structure with the test structure rigidly mounted to the slosh table. The backing board on the four
sides shall be removed so that the sides of the cube are supported by the hat sections of the
structure.
4.5.12.2 Phase II slosh (Type II tanks only). A tank shall be tested in accordance with the
procedure specified in 4.5.9.7 except that the tank shall not be subjected to vibration. The tank
shall be sloshed for at least 25 hours at 16 to 20 slosh cpm, or at least 40 hours at 10 to 16 slosh
cpm or as specified by the procuring activity.
4.5.13 Dissection after slosh. After completion of the above test, the cell shall be dissected
as shown on figure 1. The sectioned portion of each cell shall be examined for conditions
specified in MIL-STD-801.
4.5.14 Accelerated loads. The tank assembly, consisting of the tank and tank structure shall
be mounted in a support jig that provides support equivalent to the aircraft structure for which it
is designed and subjected to the applicable dynamic load tests specified herein to simulate the
aircraft design accelerations including the appropriate magnification factors. The tank shall be
tested at a fill level of 75 percent of the rated capacity. Tanks of pressurized systems shall be
subjected to the normal operating pressures for the conditions being tested, except where
unpressurized conditions are considered more critical. Deflections on various parts of the tank
structure including the areas surrounding components within the cell shall be measured during
the test.
4.5.14.1 Accelerated loads to design limit load. The tank assembly shall be subjected to 100
percent design limit accelerations at the 75 percent fill level and applicable pressure to determine
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