6-3
TABLE 6.1 PREVENTIVE MAINTENAN CE 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 turn.
Binding, not moving
freely or too loose.
6.
Before/After
Eyecup
Inspect for dirt, dust, and cracked or torn
Inspect for dirt, dust, and cracked or torn
cup. Inspect for bent, broken or improp-
erly fitting ey ecup. If nec essary, cle an
erly fitting ey ecup. If nec essary, cle an
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.