TM-9-1290-262-24-P
AIMING CIRCLE, M2A2, W/E
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT,AND GENERAL SUPPORT MAINTENANCE MANUAL
SEPTEMBER 1994
TM-9-1290-262-24-P - Page 74 of 192
ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
3-7. TEST AND ADJUSTMENT PROCEDURES (cont).
MAGNETIC NEEDLE REPEATABILITY TEST
1
2
3
4
5
6
7
8
9
10
Rotate aiming circle so that N on housing
faces in the general direction of north.
Unlock magnetic needle.
Look through magnifier (1) and turn aiming
circle to aline end of needle with edge of a
reticle line.
Hold steel block (2) close enough to aim-
ing circle to deflect magnetic needle to one
side as far as it will go.
Look through magnifier (1), then remove
steel block (2).
Observe and note needle position relative
to reticle line after needle has come to
rest.
Hold steel block (2) close enough to aim-
ing circle to deflect magnetic needle to
other side as far as it will go.
Look through magnifier (1), then remove
steel block (2).
Observe and note needle position relative
to reticle line after needle has come to
rest.
In steps 6 and 9, needle should return to
its original position within 0.5 mil (the ap-
proximate width of a reticle line). If needle
does not return to its original position with-
in 0.5 mil, notify next higher maintenance
level.
3-46
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