MIL-DTL-48554B
4800 mils, 0000 mils and 1600 mils by performing two full revolutions of the telescope
head.
4.6.7 Reticle cut-off. This test shall be performed by viewing through the eyepiece
of the telescope while turning the azimuth knob two complete revolutions of the head. The
reticle graduations and numerals shall be visible as specified in 3.7.7. This test shall be
repeated with the elbow positioned against the right and left swing stops.
4.7 Elevation mechanism.
4.7.1 Elevation mechanism excursion range. With the line of sight established in
accordance with 4.4, elevation and depression of the prism in the rotating head by means of
the elevation knob shall cause the line of sight to displace the amount specified in 3.8.1 for
elevation and depression. This test can be accomplished by using a wall target (see Figure
3) that has an established level line of sight and the excursion limits required.
4.7.2 Elevation mechanism plumb travel. This test can be performed concurrently
with 4.7.1. The telescope shall be in a level position with the vertical reticle line brought
into coincidence with the vertical target line by rotating the azimuth knob. The horizontal
reticle of the telescope shall be in coincidence with the horizontal target line by rotating the
elevation knob. Rotate the elevation knob to elevate the line of sight of the telescope 300
mils. Reverse the rotation of the knob to depress the line of sight to 300 mils depression.
Reverse the rotation again, returning the line of sight to zero elevation. The vertical reticle
line of the telescope must track the target line within the tolerance specified in 3.8.2.
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