TM 5-6675-316-14
Table 5-1.
OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES - Cont
B - Before
W - Weekly
AN - Annually
(Number) - Hundreds of Hours
D - During
M - Monthly
s
- Semiannually
A - After
Q . Quarterly
BI
- Biennially
ITEM
NO.
2
B
ITEM TO BE INSPECTED
PROCEDURE
ZOOM STEREOSCOPE 240R - Cont
Clean Optical Surfaces.
CAUTION
Do not touch optical surfaces with fingers
or wipe optical surfaces with dry cloth or
tissue.
Touching optical glass with fingers
will smudge or etch glass.
Wiping with dry
cloth or tissue will scratch optical coatings.
l Do not wipe optical surfaces until dust and
foreign matter have been removed.
l Do not use lens brush that has been used
to clean other surfaces.
l
Do not use lens tissue containing
silicone to clean optical surfaces.
Any
residue left on optical surfaces will
affect performance.
For Readiness
Reporting,
Equipment Is
Not Ready/
Available If:
5-11