MIL-DTL-62739A(AT)
4.2.6.2 Fungus. To determine conformance to 3.6.2, the PWA shall be subjected to the
fungus test in accordance with method 508.4 of MIL-STD-810 (28 day test), or equivalent
(see 4.2.1).
4.2.6.3 Shock. To determine conformance to 3.6.3. The PWA shall be subjected to the
shock test in accordance with method 516.4, procedure I, 40 g peak of MIL-STD-810, or
equivalent (see 4.2.1), and tested to 3.3 after shock test.
4.2.6.4 Vibration. To determine conformance to 3.6.4, the PWA shall be subjected to a
vibration test using a composite of figures 9 through 11. These figures represent the cargo
environment at the cargo bed of a composite of tactical wheeled vehicles, the 5-ton M813 truck
and the 12-ton M127 semitrailer. The data include differing vehicle loading conditions traversing
over specially designed courses ranging from paved highway to off road conditions at various
vehicle speeds. The spectrum is broadband random with peaks and notches at various discrete
frequency bands. Break points are provided for establishing the spectrum shape. The test
duration is 500 miles. The PWA shall be tested to 3.3 after the vibration test.
4.2.6.5 Burn-in. When required (see 6.2), the burn-in shall consist of three temperature
cycles and a six gravity unit (g) root mean square (rms) random vibration as follows:
a. Temperature cycle. Each temperature cycle shall consist of 30 minutes at -60°F
(-51°C) and 30 minutes at plus (+) 125°F (52°C). The rate of temperature change
between temperature extremes shall be not less than 5°F (2.8°C) per minute.
Power shall be applied to the PWA for not less than 30 minutes from 20°F (7°C)
through the completion of each high-temperature soak.
b. Random vibration. Following all temperature cycling, the PWA shall be hard
mounted to the vibration table so that the axis of vibration is perpendicular to the
plane of the PWA. The vibration shall be at room ambient temperature, for a
period of 10 minutes, as shown in figure 12.
NOTE: PWAs being procured for simultaneous installation in VTMs being procured do
not have to be subjected to "burn-in" provided the VTMs are subjected to the
16-hour "power on" burn-in.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
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