MIL-PRF-10436N
any ambient light and under any of the environmental conditions specified; herein, it shall
constitute failure of this test.
4.4.2 Environmental requirements verification.
4.4.2.1 Water leakage. When radiological tests are performed, this test may be accomplished
in conjunction with diffusion tests. The complete compass shall be submerged in 300 ml of
distilled or deionized water for 24 hours at 23°±5°C. The compass shall be removed from the
water and examined for water leakage. If there is evidence of water in the compass bowl at the
completion of the test, it shall constitute failure of this test.
4.4.2.2 Shock. The compass, in the open configuration (if applicable), shall be dropped twice
from a height of 90 cm onto a solid surface covered with 10 cm of 40 grit kiln dried sand. The
sand may be covered with a sheet of plastic not greater than 2 mils thick. The compass shall hit
the sand or plastic face up on one drop and edgewise on the second. Any evidence of damage
(other than cosmetic) to the compass or failure to operate as specified herein shall constitute
failure of this test.
4.4.2.3 Low and high temperature. The completed compass shall be subjected to one
complete cycle each of low and high temperature operation. The compass in its closed
configuration (if applicable) shall be subjected to a temperature of -44° ±2°C for a period of
30 minutes without the benefit of solar radiation. After this period and at this temperature, the
compass shall be opened (if applicable) and examined. The compass shall then be closed (if
applicable) and after stabilizing at room temperature, be subjected to a temperature of 68° ±3°C
for a period of 30 minutes. After this period and at this temperature, the compass shall be
opened (if applicable) and examined. During either examination, any evidence of damage or
failure of the compass dial to seek north and rotate smoothly and freely shall constitute failure of
this test.
4.4.2.4 Thermal shock (vials only). Unless certification of conformance is obtained from the
luminous source supplier, all radioactive self-luminous source vials to be installed in the
compass, shall be subjected to two successive cycles of thermal shock. Begin the cycle by
immediately placing the vials in a temperature of -52° ±2°C for 15 minutes. Remove the vials
from the cold environment immediately to a temperature of 68° ±3°C for another 15 minutes.
This constitutes one cycle. After the final cycle, the vials shall be returned to room temperature
and the sources examined. Any damage or degradation to the vials shall constitute failure of this
test.
4.4.3 Support requirements verification.
4.4.3.1 Dimension and weight. The compass shall be measured and weighed. Dimensions
greater than 9 cm long, 8 cm wide and 4 cm high, in its closed or stored configuration or weight
greater than 170 grams shall constitute failure of this requirement.
4.4.3.2 Radiological containment. If radioactive material is used in the production of compass
components, these subordinate tests are mandatory.
4.4.3.2.1 Contamination. A piece of Whatman-50 filter paper, or equivalent, moistened with
deionized or distilled water shall be used to wipe the compass. All exterior surfaces of the
compass, opened (if applicable), shall be thoroughly wiped with the filter paper. The amount of
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