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External tritium contamination. |
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|  MIL-M-70453A(AR)
requirement 3.6. In addition, the azimuth and elevation locking
knobs should be turned to a locked position with a ten (10) inch-
pound torque each.
3.3.2 Shock. The mount shall be shocked six (6) times in
each of three (3) positions. The elevation scale shall be set at
the 800 mil mark and the azimuth and elevation lockingknobs
turned to a locked position with a ten (10) inch-pound torque
each. The applied shocks shall be in a vertical, up direction
In the first position, the mounting dovetail shall be in the
horizontal plane and subjected to six (6) shocks, each at 300g
for one-half millisecond. In the second and third positions, the
mounting dovetail shall be in a vertical plane with its axis at
45 and 225 and subjected to six (6) shocks each at 200g for one
millisecond. The shock pulse shall be one-half sine wave.
3.3.3
Temperature.
3.3.3.1 Operating. The mount shall meet the requirements
of 3.7 and 3.8 inclusive, while exposed to ant thermally
0
stabilized at ambient temperatures of -50 F and +145F (-46C and
+63C).
3.3.3.2 Non-operating. The mount shall show no evidence of
physical failure such as adhesive separations, glass vial
breakage, or casting failure after having been exposed and
0
-50F and +160 F (-46C and +71C).
thermally stabilized at
Tritium in any form
3.4 External tritium contaminatiOn.
shall not be present on the external surfaces of the mount in
excess of 1000 dpm/100 sq. cm. subsequent to testing for each of
the following requirements: 3.3.1, 3.3.2, 3.3.3.1, and 3.3.3.2.
the markings of the scales, indices, and
3.5 Illumination.
level vials should be clearly distinguishable when observed with
and without a 50% neutral density filter at light levels of zero
to ten foot-candles at a distance of 18 to 20 inches from the
viewers eye.
5
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