MIL-DTL-48559B
4.6.1 Cross level adjustment. With the mount oriented as stated in 4.5, and adapter
10558253-11 positioned on the quadrant mounting surface, place inspection aid, 8658940,
on the adapter surface perpendicular to the mounting keys. The cross level adjustment
must be in the center of travel established in 4.5 before checking cross level travel. Rotate
the cross level knob until rotation reaches a positive stop. Adjust inspection aid to level
elevation and center level vial bubble. Cross level travel shall meet the requirements of
3.6.1. Rotate the cross level knob to position previously established in 4.5. Repeat the
above procedure in the opposite direction.
4.6.2 Backlash (cross level). With the mount oriented as stated in 4.5, scribe an
index line on the mounting casting nearest to the cross level knob. Place an index pointer
on the cross level knob directly opposite the scribed index line. The index pointer may be
held in place mechanically or by the use of commercial putty. Rotate the cross level knob
one turn and place the pointer in coincidence with the scribed index line. Place inspection
aid, 8658940, on adapter 10558253-11 and center the level vial bubble. Rotate the cross
level knob one half turn and return to the position originally established by the indices.
The reading on the inspection aid is required to be within the limits specified in 3.6.2 for
backlash. This procedure shall be repeated at zero cant and in three places in each
direction from stop to stop.
4.6.3 Boresight elevation adjustment. With the mount oriented as stated in 4.5,
install the sighting device, 10558253-1, (simulates elbow telescope) on the appropriate
mounting surface of the mount. Observe coincidence between the reticle of the sighting
device and the vertical and horizontal lines of the wall target. Turn slotted shaft 10554687
of the elevation adjustment located in bracket assembly 10554685 to its full extent of
travel. This rotation will activate the cam to the lowest and highest positions. The
elevation adjustment shall move the line of sight above and below the horizontal line of the
wall target to the limits specified in 3.6.3.
4.6.4 Boresight azimuth adjustment. With the mount oriented as stated in 4.5,
install the sighting device, 10558253-1, (simulates elbow telescope) on the appropriate
mounting surface of the mount. Observe coincidence between the reticle of the sighting
device and the vertical and horizontal lines of the wall target. Azimuth adjustment shall be
inspected by adjusting the opposing screws located in the mounting bracket assembly
10554687. Azimuth movement is activated by backing off one of the screws and turning in
the opposing screw. Rotation of the screw will be performed until azimuth movement has
reached the limits and or stops. This procedure will be repeated once to the left and once to
the right until the line of sight has traveled to the limits specified in 3.6.4.
4.7 Cross level knob torque. Use a standard torque measuring device with adapter
11738144 or similar to test starting and running torque as specified in 3.7.
4.8 Boresight elevation adjustment screw torque. Use a standard torque measuring
device with adapter 11738143 or similar to test starting and running torque as specified in
3.8.
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