TM 9-1290-357-15
Internal
B--Before Operation
A--After Operation
M--Monthly
D--During Operation
Operator
Org
W--Weekly
Q--Quarterly
Item
no.
Daily
Item to be
Procedure
Reference
A
inspected
nuts on micrometer knob and
while holding the knob to
prevent the scale from mov-
ing off its index, slip microm-
eter to read zero. Tighten
clampoing screws or nut.
Check zero reading with scale
again repeat if necessary.
8
Magnetic needle
------
Inspect for scratches, dirt,
reticle.
and chips.
9
------
Place instrument on a level
Magnetic needle
balance.
surface away from iron or
steel objects. Both ends cf
the needle should be the same
distance away from the glass.
10
Magnetic needle
Place instrument on a level
polarity.
surface away from iron or
steel objects. The north seek-
ing end of the needle should
point to the north.
11
Magnetic needle
Place instrument on a level
------
pivot.
surface. Displace needle by
passing an iron or steel ob-
ject across the path of the
needle. If needle does not
swing freely and come to
rest on the same reference
line in 4 seconds notify
direct support maintenance
personnel.
12
Clean exterior and interior
Carrying case.
X
periodically by brushing or
compressed air to remove
any foreign matter.
13
Instrument light M2.
Check for proper illumination,
lamps, switch, and battery
and replace if necessary.
14
Clean. Oil ball and socket joint.
Tripod, ball
X
Note. Do not disassemble the
and joint.
joint. Use only lubricating
type oil.
-----
15
Tripod.
Check legs and support for
bends, nicks and dents. Cent-
er sections should move free-
ly up and down and should
clamp rigidly in any desired
position when released.
Sufficient friction should be
present to allow adjustment
of aiming circle without
falling. Note. Dissembly or
repair will be required if any
of the above conditions are
not satisfied.
