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TABLE 6.1 PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR ATN NVM-14
(CONT.)
Item
No.
Interval
Location Item to
Check/Service
Procedure
Not Fully Mission
Capable If
4. Before/After
Battery Adapter /
Compartment
Check to make sure battery adapter
is present. Remove battery adapter
and inspect for corrosion, moisture,
corroded or defective contacts, and that
o-ring is present.
Adapter is missing,
contacts damaged or
corroded, or o-ring is
missing.
5. Before/After
Diopter Adjust-
ment Ring
Rotate diopter adjustment ring to make
sure the eyepiece is not too tight or too
loose. Range is approximately ½ turn.
Binding, not moving
freely or too loose.
6. Before/After Eyecup
Inspect for dirt, dust, and cracked or torn
cup. Inspect for bent, broken or improp-
erly fitting eyecup. If necessary, clean
with water.
7. Before/After
Objective Lens
Focus Knob
Rotate objective lens focus knob
to ensure free movement (range is
approx. 1/3 turn
Binding or not moving
freely.
8. Before/After Lens Cap
Inspect for cracked, torn, or missing
lens cap.
9. Before/After On/Off Switch
Turn switch OFF to ON. Each position
should have a definite stopping point.
Inspect for broken or missing knob.
Switch has no definite
stopping points or knob
is broken or missing.