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|  MIL-T-46386A(MU)
4.7.2.2.8 Open sight. - This test is accomplished by using the set-
up in 4.7.1. The test is performed by positioning the optical axis of
the auxiliary telescope, F5549108 close to, but not on the vertex of the
"V" grooves of the open sight and observing where the optical axis of the
auxiliary telescopes fall upon the target with respect to the 20 mil
square of the target, see Sheet 8 of Drawing F8213899. The optical axis
must fall within the square to conform with the tolerance specified in
3.7.1.3.
4.7.2.3 Elevation.
4.7.2.3.1 Elevation and plumb travel. - Return the panoramic telescope
to the position outlined in 4.7.1. Scribe an index line on the elevation
knob in-line with an index scribed on the head. Perform these tests by
rotating the azimuth fixture plate to direct the panoramic telescope's
optical axis toward a plumb line. Position a plumb line in coincidence
with the center vertical reticle line. Position the vertical target line
in coincidence with the plumb and verticle reticle line and raise or lower
the target to obtain coincidence between the target horizontal line and the
horizontal reticle line of the panoramic telesacope's reticle. The plumb
travel test is performed by actuating the panoramic telescopes elevation
knob from the zero setting to each extreme. The line of sight must travel
to the limit lines of the target to assure compliance with 3.7.3 and must
follow the center vertical line from zero elevation within the width of
the target limit line to assure compliance with 3.7.3. Repeat this
procedure at approximately six different azimuth settings by turning the
panoramic telescope's azimuth mechanism in one direction and the rotating
surface of the test fixture in the opposite direction to obtain the point
of coincidence mentioned above.
4.7.2.3.2 Elevation backlash. - This test can be performed in con-
junction with the previous test by sighting through panoramic telescope
and by means of the elevation knob raise or lower the line of sight to a
selected line on the target (do not override this target line) and SCribe
a line on the head casting in line with the index on the elevation knob.
Rotate the elevation knob past this selected target line and return to
the coincided lines mentioned and observe where the optical axis (line of
sight) falls with respect to the previously selected target line. This
difference, if any, as measured by the thickness of the reticle line,
shall not exceed the limits outlined in 3.7.6.3.
4.7.2.4 Operability. - When the panoramic telescope has been stabilized
at the extreme operating temperatures specified in 3.9.2, tactile inspection
techniques shall be used to determine compliance outlined in 3.9.2.
4.7.2.4.1 Torque. - Torque tests shall be performed under temperature
conditions outlined in 3.9.1. The torque tests shall be performed using
a torque wrench and appropriate adapter. The torque readings obtained
shall conform to the limits specified in 3.9.1.
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