MIL-DTL-24705B(SH)
4.6.4 Shock The multiple cable penetrator test specimen shall be subjected to Grade A, Class I, Type A shock
test in accordance with MIL-S-901. The mounting fixture shall be Type 4A for the lightweight shock machine or
standard deck and bulkhead mounting on the medium weight shock machine. Following the test, the multiple cable
penetrator shall meet the acceptability requirements of MIL-S-901 and shall pass the watertightness test specified in
4.6.5 Watertightness. The multiple cable penetrator test specimen mounted on the test plate shall be bolted to
the hydro chamber so that one side of the test specimen is exposed to water, and the opposite side of the test
specimen is exposed to air. The hydro chamber shall then be filled with water and pressurized to 1.9 Bars (27.5
pounds per square inch). This pressure shall be maintained for a minimum of 10 minutes unless specimen failure
occurs sooner. The test specimen shall be considered as having failed the watertightness test if, after 10 minutes, the
water pressure has decreased to less than 1.9 Bars.
permeability indicator in accordance with ASTM A342/A342M. Nonmagnetic parts shall meet the requirements
specified in 3.5.4.
4.6.7 EMC. When applicable (see 6.2), the multiple cable penetrator test specimen shall be subjected to the
EMC tests specified in the contract or purchase order. Multiple cable penetrators shall meet the requirements
specified in 3.5.5.
4.6.8 Salt spray test. The multiple cable penetrator test specimen shall be tested in accordance with ASTM
B117. The exposure time shall be 48 hours. Multiple cable penetrators shall meet the requirements specified in
4.6.9 Fire stop test. The multiple cable penetrator test specimen shall be as specified in 4.3.1.1, except the
frame shall be steel only. The test specimen shall be subjected to the fire stop test specified in 4.6.9.1 and 4.6.9.2.
4.6.9.1 Test equipment. The fire stop test equipment shall consist of a test stand with a fire chamber, an
exhaust and vacuum chamber, eight thermocouples, and a 500,000 British thermal unit (Btu) propane burner. The
propane burner shall be mounted in the fire chamber so that it will be 305 mm (12 inches) from the face of the test
specimen.
4.6.9.2 Test procedure. The multiple cable penetrator test specimen shall be mounted on the test plate bolted to
the test stand. Thermocouples shall be placed on both sides of the test specimen at the following locations: two on
the fire side, one 203 mm (8 inches) from the penetrator face, and one in the center of the penetrator face; six on the
non-fire side, three on the vertical centerline at the top, center, and bottom of the insert material; two opposing
corners on the insert material; and one on the metal bulkhead 25 mm (1 inch) above the penetrator. The flame shall
be applied to the test specimen for not less than 1 hour at a temperature of 1093 °C measured at the thermocouple
located at the center of the cable bundle.
4.6.9.3 Rejection criteria. The multiple cable penetrator test specimen shall be considered as having failed the
fire stop test if, at the end of 1 hour, the fire has spread through the test specimen to the cables on the unexposed
(non-fire) side of the test stand.
4.6.10 Durometer. A sample of each insert material being submitted for qualification shall be subjected to a
Type A durometer test in accordance with ASTM D2240. Insert materials shall meet the requirements specified in
4.6.11 Compression. A sample of each insert material being submitted for qualification shall be tested in
accordance with ASTM D395. Insert materials shall meet the requirements specified in 3.5.9.
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