Afocal/Cover Boresight.
The night sight is boresighted (Figure 2-11) by rotating the AZ
boresight adjustment and EL boresight adjustment knobs.
The AZ
boresight adjustment knob is attached to one end of the boresight
screw and the boresight drive nut is screwed on the other end.
Rotating the lock releases the AZ boresight adjustment knob.
Rotating the AZ boresight adjustment knob clockwise screws the
boresight drive nut out, pushing the boresight frame with afocal
optics lens switching assembly against the spring-loaded yoke
assembly. Rotating the AZ boresight adjustment knob counterclockwise
screws the boresight drive nut in, allowing the spring-loaded yoke
assembly to push the boresight frame horizontally toward the AZ
boresight adjustment knob.
Rotation of the AZ boresight adjustment
knob causes the boresight frame to move left or right about 0.096-
inch for boresight adjustment.
The EL boresight knob performs an
identical mechanical function in the vertical plane.
Figure 2-11.
Boresight.
27
MM4812
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