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MIL-M-48559A(AR)
3.8.2 Backlash {cross level). Backlash in the cross level
mechanism (3.7.1) shall not exceed 1.5 mils at any setting between
34 degrees to the left and 34 degrees to the right.
adjustment. The elevation boresight
3.8.3 Boresight
adjustment shall move a line of sight a minimum of 18 mils above
and 18 miles below horizontal utilizing the slot in bracket
assembly 10554685 as a pivot point. This requirement shall be met
with conditions of 3.5 established.
3.9 Operability
torque.
3.9.1 Cross level knob. The running torque requiared to
rotate the cross level knob shall be within the limits of 4 to 12
0
inch-lbs when checked at standard ambient temperature (+60 to
+90F). Starting torque shall not exceed 18 inch-lbs. When
checked at the temperature conditions specified in 3.7.2, the
running and starting torque shall not exceed 30 inch lbs.
3.9.2 Boresight  adjustment  elevation. The running and
starting torque required to rotate the boresight adjustment screws
0
0
at standard ambient temperature (+60 to +90 F) shall not exceed
11 inch-lbs. When checked at the temperature conditions specified
in 3.7.2, the running and starting torque shall not exceed 27
inch-lbs.
3.10 Interchangeability.
3.10.1 Mounting surface for Quadrant, M18.  Interchange-
ability shall be verified by the insertion, seating, securing, and
subsequent removal of maximum fit gage on the mounting surface for
the M18 Quadrant.
3.10.2 Mounting surface of Mount, M172.  Interchangeability
shall be verified by the insertion, seating, securing, and
subsequent removal of maximum fit gage on the mounting surface of
the M172 Mount.
3.10.3 Mounting  surface  for  Telescope,  Elbow  M138.  Inter-
changeability shall be verified by the insertion, seating,
securing, and subsequent removal of maximum fit gage on the
mounting surface for the M138 Telescope.
3.11 Reliability. The Mount shall be subjected to
reliability assurance tests as follows:
a. The Mount shall meet the requirements of storage
and operation temperatures of paragraphs 3.7.1 and 3.7.2.
5

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