MIL-DTL-5578D
f. Shots where metallic fingers or composite fragments project into wounds, and in a
mechanical manner, prevent the sealant from functioning
g. Shots where coring is present.
4.5.5.4 Fuel aging following gunfire resistance. After the gunfire resistance test of 4.5.5.3,
the test cube shall be emptied and inspected, and any wounds which failed to seal (but did not
disqualify the test cube) shall be plugged. The test cube shall be refilled with JP-5 or JP-8 or
other test fluid as specified by the procuring activity. After 24 hours test cube l shall be emptied,
and the wounds shall be carefully examined. There shall be no evidence of deterioration of the
inner-layer ply or sealant.
4.5.5.5 Stand. For this test, a tank mounting structure in accordance with 4.4.3 shall be used.
The stand test (see 4.5.2) shall be conducted on the third test cube which shall be the same cell
subjected to the slosh resistance test (see 4.5.5.2). The test cube shall be adequately supported,
completely filled with JP-5 or JP-8 or other test fluid as specified by the procuring activity and
allowed to stand. The cell shall be carefully examined every 30 days for any evidence of failure.
If no evidence of failure is found after 90 days, the test cube shall have passed this test.
4.5.6 Installation. For this test the aircraft or a section thereof shall be used. The installation
test shall be conducted prior to the pressure test described in 4.5.8. The installation test shall
consist of removing and installing the tank in the test structure three times. Applicable service
procedure shall be followed in tank installation and removal. All tank fittings shall be fastened
to corresponding structure fittings and interconnect fittings at each installation. The tank shall
pass in accordance with MIL-STD-801 at the completion of this test.
4.5.7 Capacity. The cell, installed in a structure approved by the procuring activity, shall be
slowly filled to capacity with fluid. The volume in gallons and the head in inches shall be
recorded at a sufficient number of points during the filling to construct a head-versus-volume
curve.
4.5.8 Pressure. For this test, the tank shall be mounted in the slosh test structure. All
openings in the tank shall be sealed during the pressure test. All parts necessary to effect a
satisfactory seal at the openings shall be furnished by the aircraft contractor. Tanks shall be
subjected to a pressure equivalent to the normal head measured at the bottom of the tank
multiplied by a factor of 1.5. Pressures shall be measured by means of a manometer using JP-5
or JP-8 or other test fluid as specified by the procuring activity. Once temperature and pressure
are stable, conduct the tests specified in 4.5.8.1 and 4.5.8.2. No loss in pressure shall occur
during the 15 minute duration of this test.
4.5.8.1 Proof pressure. After all air has been bled from the tank and the necessary ports
plugged, hydrostatic pressure equal to 1.33 times the maximum operating pressure shall be
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