MIL-PRF-51028C
components, case, or packing material, or inability to perform tests, or satisfy test precision
criteria shall constitute failure of this test.
4.5.2.4 Low Temperature - Operational. The test kit, with case open, shall be subjected to a
low temperature environment of -25 ± 1 °C for a period of 4 hours. At the end of this exposure,
while still at -25 ± 1 °C, conduct the test procedures cited in 4.5.1.3 and 4.5.1.4. In addition to
the conformance criteria cited therein, functional failure of the kit components, inability to
perform the tests or satisfy test precision criteria shall also constitute failure of this test.
4.5.2.5 Water resistance. For the water resistance test, the kit shall be in its transit or storage
configuration. A water spray shall be directed through nozzles to cover the parting line between
sections of the case, hinge(s), and the carrying handle(s). The spray nozzle shall give uniform
water distribution and have a flow capacity of not less than 4 liters/minute (1 gallon/minute), at a
207 to 276 kPa (40 psi) water-line pressure, and water temperature between 4 ±1 °C and
24 ±1 °C. Fogging nozzles shall not be used. The spray shall be angled to each of the surfaces so
water strikes at an angle between 40° and 90° to the surface. Spray time on each case surface
shall not be less than 3 minutes continuous. At the conclusion of the test, the case shall be
examined visually for water leakage to its interior. Water leakage shall constitute failure of the
test.
4.5.3 Transportability.
4.5.3.1 Transportability. The kit shall be put in the transport mode and carried by one person
for a distance of 50 meters (164 ft). The contents shall be examined for damaged items or items
not secured. All items shall then be removed from their secured positions. Components shall be
re-packed, using the loading diagram as a guide, the case returned to transport mode, and carried
by one person for a distance of 50 meters. Upon completion, the kit shall be examined for
damage to the case and components. The inability to successfully carry the kit for the specified
distance, inability to re-pack components per the loading diagram, changes in configuration, or
difficulty in re-packing resulting from improper fit, shall constitute failure of this test. Any
permanent deformation, cracks, or damaged items from any cause shall also constitute failure of
this test.
4.5.3.2 Vibration. The kit shall endure 40 minutes of vibration in each of 3 axes. The test bed
shall produce a 2.5 cm (1.0 inch) double amplitude, orbital path, at 5 Hz minimum. Upon
completion of this test, each kit shall be examined for damage to the case and each component
and accessory. Damage or breakage of the case or any component of the kit shall constitute
failure of this test.
4.5.3.3 Shock. The kit shall be dropped onto a 20 cm (8.00 inch) thick bed of dry sand, from
a height of 122 cm (48.00 inches). The kit shall be dropped on the two edges along the length of
the bottom and the two edges along the width of the bottom. For edgewise drops, the striking
edge of the kit shall be parallel to the dropping surface and the kit's center of gravity shall be
directly above the striking edge, at the instant of release. Drop tests shall be conducted at -32
±3 °C and 49 ±3 °C. The kit temperature shall be at the specified ambient temperature prior to
the drop tests. The kit shall be subjected to a total of four drops at each temperature specified.
All drops shall be made so that the test kit falls freely through the distance of 122 cm. Upon
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