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|  MIL-S-45669A(MU)
3.6 Orientation.- The bore sight shall be clamped securely in each
of the three mounting positions shown in Figure 1 with the respective V
slide contacting the longitudinal portion of a smooth 4.5 inch diameter
tube or equivalent, whose axis is inclined precisely 45 degrees above
the horizonal. The following conditions shall be met at each of the
above specified positions unless otherwise specified.
3.7 Accuracy.
3.7.1 Collimation.- The line of sight of the elbow telescope shall
be parallel to the vertical plane passing through the axis of the corr-
esponding V slide within 3 roils for positions (a) and (c) of Figure 1.
3.7.2 Plumb travel.- Using position (a) of Figure 1 in accordance
with 3.6 and with the line of sight of the elbow telescope in a hori-
zontal plane and in coincidence with a plumb line, the line of sight
shall not deviate from the plumb line by more than 2.0 roils total dis-
placement from maximum depression to maximum elevation.
3.7.3 Parallelism of reticle and image.- The vertical crossline on
the reticle shall be parallel to the image of a plumb line within 1 degree.
3.7.4 Cross level vial.- The respective cross level bubble shall be
central witin 5 minutes.
3.7.5 Elevation level vial.- The elevation level bubble shall be
central within 5 minutes.
3.8 Telescope travel.- With position (a) of Figure 1 established
in accordance with 3.6, the telescope shall be capable of being rotated
a minimum of 45 degrees in elevation and 30 degrees in depression.
3.9 Operating temperature.- The bore sight shall meet the torque
requirements of 3.10 when thermally stabilized at ambient temperatures
of minus 40 degrees Fahrenheit and plus 150 degrees Fahrenheit and the
strap assembly shall be completely operable when securing and loosen-
ing the bore sight to the tube.
3.9.1 Clamp screw.- The clamp screw, in a free state, shall be op
erable throughout its threaded portion without restriction or binding
at all temperatures specified above.
3.10 Torque.- The torque required to elevate and depress the tele-
scope through full travel shall not exceed 10 pound inches nor be less
than 2 pound inches at room temperature (60 to 90 degrees). The torque
required to elevate and depress the telescope through full travel shall
not exceed 28 pound inches nor be less than 2 pound inches at the extreme
temperatures specified in 3.9.
3.11 Strap assembly.- The bore sight or strap assembly shall not
become loosened as a result of applying 2 pounds direct force at the
knurled portion of the clamping screw once in each opposing direction
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