MIL-DTL-52849E
4.5.3 Environmental.
4.5.3.1 Waterproof and water vapor-proof. For the waterproof and water vapor-proof
test close and latch the test kit case, direct a water spray through nozzles to cover the parting line
between the sections of the case, hinge(s), and the carrying handle(s). The spray nozzle shall
give uniform water distribution and shall have a flow capacity of not less than 1 ± 0.1 gallon per
minute (gpm) (3.8 ± 0.4 liter/minute) per nozzle at 40 pounds per square inch (psi) (275
kiloPascals (kPa)) water pressure. Fogging nozzles shall not be used. Angle the spray to each of
the surfaces so water strikes at an angle of between 40 and 90 degrees to the surfaces. Spray
time on each case surface shall not be less than 3 minutes continuous at 30 to 40 psi (207 to 275
kPa) water-line pressure and water temperature between 40 ± 2 °F to 75 ± 2 °F (4 ± 1 °C to 24 ±
1 °C). At the conclusion of the spray period, the case shall be opened and examined for water
leakage to the case interior. Water leakage shall constitute failure of the test.
4.5.3.2 High temperature-storage. The test kit, with case closed, shall be subjected to a
high temperature environment of 145 ± 2 °F (63 ± 1 °C) for 4 hours, after an initial period of 6
hours at 120 ± 2 °F (49 ± 1 °C). Raising and lowering of the temperature shall be accomplished
within a period of 1 hour, for a total cycle time of 12 hours. A minimum of seven cycles (84
hours) is required. At completion of the last cycle, adjust chamber air temperature to 68 ± 2 °F
(20 ± 1 °C) and maintain until temperature stabilization of test kit has been achieved. Conduct
the test procedures outlined in 4.5.1.1 through 4.5.1.3. In addition to the conformance criteria
cited therein, the kit case and packing material shall be examined for deterioration, brittleness, or
cracking. Functional failure of the kit components, case, or packing material, or inability to
perform tests, or satisfy test precision criteria shall constitute failure of this test.
4.5.3.3 High temperature-operational. The test kit, with the case open, shall be subjected
to a high temperature of 120 ± 2 °F (49 ± 1 ºC) for a period of 4 hours. Conduct the test
procedures outlined in 4.5.1.1 through 4.5.1.3, while the temperature is maintained at 120 ± 2 °F
(49 ± 1 °C). 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 constitute failure
of this test.
4.5.3.4 Low temperature-storage. The test kit, with the case closed, shall be subjected to
a low temperature environment of -25 ± 2 °F (-32 ± 1 °C) for a period of 48 hours. At the end of
this exposure, adjust the chamber air temperature to 68 ± 5 °F (20 ± 1 °C) and maintain until
temperature stabilization of test kit has been achieved. Conduct the test procedures cited in
4.5.1.1 through 4.5.1.3. In addition to the conformance criteria cited therein, the kit case and
packing material shall be examined for deterioration, brittleness, or cracking. Functional failure
of the kit components, case, or packing material, or inability to perform tests, or satisfy test
precision criteria shall constitute failure of this test.
4.5.3.5 Low temperature-operational. The test kit, with the case open, shall be subjected
to a low temperature environment of -25 ± 2 °F (-32 ± 1 °C) for a period of 4 hours. At the end
of this exposure, adjust the chamber air temperature to 35 ± 2 °F (2 ± 1 °C) and conduct the test
procedures cited in 4.5.1.1 through 4.5.1.3. In addition to the conformance criteria cited therein,
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