MIL-DTL-48554B
3.7.6 Image tilt. The image of a vertical target line shall be vertical and shall not be
greater than one degree of arc (17.78 mils) throughout two (2) revolutions of the head.
This requirement shall also be met with the elbow assembly positioned against the right
and left swing stops.
3.7.7 Reticle cut-off. All reticle graduations, including the "80" numerals, shall be
visible throughout two (2) complete revolutions of the head. This requirement shall be met
with the elbow assembly centered and positioned against the right and left swing stops.
3.8 Elevation mechanism.
3.8.1 Excursion range. Rotation of the elevation knob shall cause the line of sight
to elevate and depress a minimum of 300 mils in each direction from the position specified
in 3.4.
3.8.2 Plumb travel. Starting with the intersection of the panoramic telescope
vertical and horizontal reticle lines in coincidence with a vertical target line at zero
elevation, the intersection shall track the target line within 1.0 mil total lateral spread
throughout the entire excursion when elevated to 300 mils elevation and depressed to 300
mils depression.
3.9 Azimuth mechanism.
3.9.1 800 mil steps. Error at deflection or bearing readings in 800 mil steps
throughout two full revolutions of the head in one direction shall not be greater than 1.0 mil
without backlash removed. The total spread between the greatest positive error and the
greatest negative error shall not be greater than 1.0 mil, without backlash removed. The
total error, with backlash removed, between the azimuth counter reading and the deflection
or bearing counter reading for any one number shall not be greater than 0.25 mil.
3.9.2 15 mil steps. Rotating the correction knob to indicate 15 mils, followed by
rotation of the azimuth knob in the opposite direction with backlash removed, to deflect the
line of sight 15 mils, shall cause the deflection or bearing counter to return to within 0.25
mil of the original setting. This requirement shall be met with the 15 mil value set into
each direction ("R" and "L") of the correction counter.
3.9.3 Level travel. Starting with the horizontal reticle line of the pantel in
coincidence with a horizontal target, the line of sight shall track the target within 1.0 mil
(total spread of 2 mils) when the head is rotated through two complete revolutions in
azimuth.
3.9.4 Lift. Vertical displacement of the line of sight due to reversing rotation of the
head by means of the azimuth knob shall not be greater than 0.5 mil.
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