MIL-DTL-62545E
4.6.8.4 Leakage. The MSEC shall not be operated during the following tests. The MSEC shall not evidence any
leakage. Subsequent to these tests the MSEC shall pass the tests specified in 4.6.8.
4.6.8.4.1 Water immersion. To determine conformance to 3.5.4.1, a non-operating MSEC shall be submerged in
water by one of the two methods below. Bubbles coming from within the MSEC shall be considered leakage.
However, bubbles which result from trapped air on external surfaces of the MSEC shall not be considered leakage.
The MSEC shall subsequently pass the tests specified in 4.6.8.
The temperature of the water and the MSEC shall be 23°C ± 10°C (73°F ± 18°F). The MSEC shall be
a.
immersed in water so that the uppermost part of the MSEC is 50 mm ± 25 mm (2 inch ± 1 inch) below the
surface of the water. The initial air pressure above the water shall be reduced to 480 mm Hg (19.0 inch
Hg) absolute and maintained for 1 minute or until air bubbles substantially cease to be given off by the
water, whichever is longer. The air pressure above the water shall then be increased to 510 mm Hg (20
inch Hg) absolute and maintained for 60 minutes.
b.
The MSEC shall be tested in accordance with MIL-STD-810, method 512.2, procedure I. The MSEC shall
be heated 27°C (49°F) above the water temperature of 23°C ± 10°C (73°F ± 18°F) and submerged to a
depth of 1 meter (39.4 inches).
4.6.8.4.2 Diesel fuel immersion. Prior to immersion in diesel fuel conforming to grade No. 2-D of A-A-52557, the
temperature of the MSEC shall be 45°C ± 3°C (113°F ± 5°F); the temperature of the diesel fuel shall be 18°C ± 5°C
(64°F ± 9°F). The container shall be of sufficient capacity so that immersion of the MSEC shall not raise the
temperature of the fuel more than 3°C (5°F). The MSEC shall remain immersed for 120 ± 5 minutes. The uppermost
point of the MSEC shall be at least 50 mm (2 inches) below the surface. Upon completion of the test period, remove
the MSEC from the diesel fuel and wipe the exterior surfaces only. The MSEC shall be weighed before and after this
test. The weights shall not vary more than 0.5 gram (0.02 ounce).
4.6.8.4.3 Water jet. To determine conformance to 3.5.4.1, a water jet spray shall be applied at right angles to
surfaces of a non-operating MSEC at a distance of 300 mm (12 inches) from the surface to the jet. The surface shall
be cleaned at not less than 0.02 square meter per minute (0.2 square feet per minute). The water jet shall be derived
from a nozzle having an orifice diameter of not more than 6 mm (.25 inch) and a nozzle pressure of 345 ± 105 kPa
(50 ± 15 psi).
4.6.8.5 Salt fog. To determine conformance to 3.5.5, a non-operating MSEC shall be subjected to the tests of MIL-
STD-810, method 509.2, except the test shall last 200 hours. The MSEC shall subsequently pass the tests specified
in 4.6.8.
4.6.8.6 Fungus. To determine conformance to 3.5.6, a non-operating MSEC shall be subjected to the fungal
incubation as specified in ASTM-G21, for a period of 90 days. The MSEC shall not demonstrate a susceptibility to
fungal growth that could cause its performance to fall outside the limits specified herein. The MSEC shall
subsequently pass the tests specified in 4.6.8 without cleaning.
4.6.8.7 Sand and dust. To determine conformance to 3.5.7, a non-operating MSEC with connectors attached shall
be tested in accordance with MIL-STD-810, method 510.2, procedure I. The high temperature portion of testing shall
be conducted at 71°C (160°F). The MSEC shall subsequently pass the tests specified in 4.6.8.
4.6.8.8 Humidity. To determine conformance to 3.5.8, the MSEC shall pass the tests specified in 4.6.8 during and
after exposure to warm, high relative humidity in accordance with the applicable conditioning procedure for ground
electronic equipment of MIL-STD-810, method 507.2. After conditioning, the MSEC shall be exposed to five
continuous 48 hour cycles in accordance with figure 8. Prior to post exposure operation, the MSEC shall be
conditioned for 24 hours at 23°C ± 3°C (73°F ± 5°F) and 50 percent ± 10 percent relative humidity.
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