ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
4-4. TEST AND ADJUSTMENT PROCEDURES (cont).
INSTALLING AND LEVELING AIMING CIRCLE ON AZIMUTH TEST FIXTURE ADAPTER (cont)
NOTE
In steps 13 thru 21, azimuth level vial
(10) bubble should stay centered and
not exceed the width of a vial gradua-
tion.
13
Turn aiming circle to zero using azimuth
knob (7). Eliminate all error in azimuth
level vial (10) by loosening plug (11) and
turning eccentric (12) right or left, as re-
quired, to center level vial bubble.
Hold eccentric (12) in adjustment with
14
screwdriver while tightening plug (11) with
spanner wrench.
Rotate aiming circle to 3200 roils using
15
azimuth knob (7).
16
if azimuth level vial (10) bubble does not
stay centered, eliminate half the error by
adjusting eccentric (12) and remaining
error by adjusting knob assembly (4).
17
Return aiming circle to zero using azimuth
knob (7). Azimuth level vial (10) bubble
should remain centered. If not, repeat
steps 13 thru 16 until azimuth level vial
bubble remains centered.
Turn aiming circle to 1600 roils using azi-
18
muth knob (7). If azimuth level vial (10)
bubble is not centered, eliminate all error
by adjusting knob assembly (4).
Return aiming circle to zero using azimuth knob (7). Azimuth level vial (10) bubble should
19
remain centered. If not, repeat steps 13 thru 16.
20
Using azimuth knob (7), rotate aiming circle in four settings of 1600-mil increments. Azimuth
level vial (10) bubble should remain centered. If not, repeat steps 11 thru 16.
If azimuth level vial (10) bubble does not center after performing above steps, repeat steps 7
21
thru 20.
4-22
