MIL-DTL-46789D(AT)
4.7 Interface requirements verification. Verify the envelope dimensions and mounting
interface by measurement and placement, and the electrical interface by connection and
disconnection of cables and connectors, in the existing location on different types of fully
tracked combat vehicles (see 3.5).
4.8 Support and ownership requirements verification.
4.8.1 Safety inspection. To determine conformance to 3.6.1, assemblies shall be
inspected for hazardous burrs, nicks, sharp edges, foreign materials, or other imperfections that
pose physical danger to an installer/operator. Inspect the assembly for exposed, frayed,
unsecured, or otherwise improperly protected circuits that pose electrical danger to the
installer/operator (see 6.8).
4.8.2 Identification. To determine conformance to 3.6.2, verify the presence of the
required markings on the assembly. After performing all environmental tests in 4.9, re-inspect
the assembly markings for readability.
4.9 Operating environment requirements verification.
4.9.1 Waterproofness. To determine conformance to 3.7.1, submerge the assembly in
distilled water contained in a vacuum vessel. Observe for air leakage while holding a vacuum
differential of 41.4 kPa for not more than 30 minutes. Repeat the test after inverting the
assembly. A steady stream of bubbles from any surface shall be cause for rejection. Following
this test the assembly shall be subjected to and pass the electrical output test of 4.6.1.
4.9.2 Sand and dust proof. To determine conformance to 3.7.2, subject the assembly to
the sand and dust proof test of MIL-STD-202, Method 110, test condition A or equivalent
(see 4.3.1), using a sand and dust velocity of 762 ±152 m/min for 6 hours at 25 °C and
762 ±152 m/min for 6 hours at 71 °C. Following this test the assembly shall be subjected to and
pass the electrical output test of 4.6.1.
4.9.3 Fungus resistance. To determine conformance to 3.7.3, subject the assembly to the
fungus resistance test of ASTM G21. Following this test the assembly shall be subjected to and
pass the electrical output test of 4.6.1.
4.9.4 Shock resistance. To determine conformance to 3.7.4, subject the assembly to the
shock test specified in MIL-STD-810, Method 516.4, procedure I or equivalent (see 4.3.1), for a
total of 18 sawtooth wave shock pulses. Peak amplitude shall be 75.0 ±7.5 g with a time
duration of 6.0 ±0.6 ms measured at the 10 percent amplitude points. Following this test the
assembly shall be subjected to and pass the electrical output test of 4.6.1.
4.9.5 Corrosion resistance. To determine conformance to 3.7.5, subject the assembly to
the corrosion resistance test of MIL-STD-202, Method 101, test condition B or equivalent
(see 4.3.1). Following this test the assembly shall be subjected to and pass the electrical output
test of 4.6.1.
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