TM 5-6675-31614
Table 5-1. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES - Cont
B - Before
W - Weekly
AN - Annually
D - During
M . Monthly
s
- Semiannually
A - A f t e r
Q - Quarterly
BI
- Biennially
ITEM
NO.
1
lN-
TER-
VAL
—
B
(Number) - Hundreds of Hours
ITEM TO BE INSPECTED
PROCEDURE
ZOOM STEREOSCOPE 240R - Cont
Inspect Stereoscope - Cont
20. Lift zoom power-changer knob until click is
heard.
21. Rotate right and
knobs.
22. Check for image s
left independent zoom control
ize changes as knob is rotated.
23. Adjust until each image is equal in size.
24. Turn
25. Turn
image rotation lock rings to left (unlock).
image rotation control rings.
Check that
images rotate through
26. If stereoscope is not
cover to prevent dust
on optical surfaces.
360 degrees.
to be used immediately,
or dirt from settling
For Readiness
Reporting,
Equipment Is
Not Ready/
Available If:
No change
in image
size.
No image
rotation.
5-10
