ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49 A7-3-72/74
10 If circular level bubble does not stay cen-
tered, eliminate half the error by adjusting
either of two setscrews (9) and eliminate
remaining error by adjusting the knob as-
semblies (4).
11 Return aiming circle to zero using azimuth
knob (7). Circular level vial bubble should
remain centered. If not, repeat steps 7
thru 10 until circular level vial bubble stays
centered.
NOTE
In steps 12 thru 21 below, tube level
vial will be referred to as azimuth
level vial.
12
Using azimuth knob (7), turn aiming circle
in four settings of 1600-mil increments.
Azimuth level vial (10) bubble should re-
main centered at each position. If it re-
mains centered, proceed to eyepiece focus
adjustment. Refer to page 4-23. If the
azimuth level vial (10) bubble does not re-
main centered, proceed to step 13.
4-21
