Figure 4. Horizontal filament image.

TB 9-4935-552-50-2

Figure 3. Vertical filament image.

f. Manually rotate the TI prism until the filament is horizontal, figure 4. Adjust the

gimbal mounts control to recenter the image as required.

g. Observe the filament image. The filament image should be defined clearly enough

to be readable to within 1/2 reticle division. If the image needs focusing, go to 10a(1).

h. Position the top edge of the image at +10 on the reticle, figure 4.

i. Manually rotate the filament image 180 degrees cw and record the reticle position of

the top edge of the image.

j. Repeat step i three times. Each recorded value shall be between +6 and +14. If out

of tolerance, proceed to step 10b(1).