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|  MIL-M-48557A(AR)
exhibit no evidence of damage and shall meet the requirements
of 3.7.5 through 3.10.
3.7.4.2 Vibration "B". The mount shall be vibrated in a
vertical plane at a constant frequency of 30 5 cycles per
second with an amplitude of 1/16 inch (1/8 1/64 inch total
excursion) for a period of five minutes plus or minus 15
seconds. Subsequent to vibration, there shall be no evidence
of physical failure and the mount shall meet the requirements
of 3.7.5 through 3.10.
3.7.5
Radiological
requirement.
3.7.5.1 External tritium contamination. Tritium shall not
be present on the external surfaces of the mount is excess of
1000 dpm/100 square centimeters.
3.7.5.2 Illumination check. Illumination areas shall be
given a visual check to determine adequacy of illumination in a
darkened area subsequent to requirements 3.7.1 thru 3.7.4.2.
3.8
Performance.
3.8.1 Elevation travel. The locating keyway of the
vertical mounting surface shall rotate through an excursion of
at least 1333 mils in elevation and 270 mils in depression from
the position established in 3.6.
3.8.2 Deviation. The line of sight shall not deviate
horizontally from the position obtained when mount is oriented
as specified in Paragraph 3.6 by more than .25 mil when rotated
through an excursion of 270 mil depression to 800 mil
elevation. Without changing starting point, the line of sight
shall not deviate more than .5 mil total lateral spread through
the balance of the excursion as specified in 3.8.1.
3.8.3 Pitch level travel. The mount shall travel through
an excursion of at least 178 mils right and 178 mils left.
3.8.4 Plumb travel. A line os sight shall track a plumb
line within 0.5 mil (total lateral spread) when the mount is
subjected throughout the range of requirements of 3.8.3.
3.8.5 Backlash (pitch level). Baccklash shall not exceed
1.5 mils at zero elevation.
3.8.6 Cross level travel. The mount shall travel
throughout an excursion of a least 178 mils to the left and
178 rolls to the right.
5
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