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|  MIL-M-48559A(AR)
4 .8.2.3 Mounting Surfaces for Gunner's Quadrant. Place a
calibrated gunner's quadrant 8658940 on the mounting surface's for
the gunner's quadrant. The mounting surfaces for the gunner's
quadrant shall be parallel within the requirement- of 3.6.2 as
mess-urea with the gunner's quadrant.
4.9
Performance.
4.9.1 Cross level adjustment. With adapter 10558253-11
positioned on the quadrant mounting surface, place calibrated
gunner's quadrant 8658940 on the adapter, surface, perpendicular
to the mounting keys. The cross level adjustment must be in the
center of travel as established in 4.8.2.1 before checking cross
level travel. Rotate the cross level knob until roation reaches
a positive stop. Adjust gunner's quadrant to level elevation and
center level vial bubble. Cross level travel shall be as
specified in paragraph 3.8.1. Rotate cross level knob to position
previously established in 4.8.2.1. Repeat the above procedure in
the opposite direction. This test can be performed in conjunction
with 4.9.2.
4.9.2 Bashlash (cross level). The test for backlash in the
cross level adjustment may be accomplished in conjunction with the
preceding test using the calibrated gunner's quadrant. 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 the gunner's quadrant 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
gunner's quadrant is required to be within the limits specified in
3.8.2 for backlash. This procedure shall be repeated at zero cant
and in three places in each direction from stop to stop.
4.10
Boresiqht
adjustment.
4.10.1 Elevation adjustment. Position the mount as
specified in 3.4. Position sighting device 10558253-1 (simulates
elbow telescope) in the appropriate mounting surface of mount.
Observe coincidence between the reticle of the sighting device and
the vertical & 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
3.8.3.
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