TABLE 6.1 PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR ATN NVM-14 (CONT.)
Item | Interval | Location Item to |
Procedure
Not Fully Mission
No. | Check/Service |
Capable If
4. | Before/After | Battery Adapter / | |
Compartment | |||
5. | Before/After | Diopter Adjust- | |
ment Ring | |||
|
| ||
6. | Before/After | Eyecup | |
7. | Before/After | Objective Lens | |
|
| Focus Knob | |
8. | Before/After | Lens Cap | |
9. | Before/After | On/Off Switch |
Check to make sure battery adapter is present. Remove battery adapter and inspect for corrosion, moisture, corroded or defective contacts, and that
Rotate diopter adjustment ring to make sure the eyepiece is not too tight or too loose. Range is approximately 1⁄2 turn.
Inspect for dirt, dust, and cracked or torn cup. Inspect for bent, broken or improp- erly fitting eyecup. If necessary, clean with water.
Rotate objective lens focus knob to ensure free movement (range is approx. 1/3 turn
Inspect for cracked, torn, or missing lens cap.
Turn switch OFF to ON. Each position should have a definite stopping point. Inspect for broken or missing knob.
Adapter is missing, contacts damaged or corroded, or
Binding, not moving freely or too loose.
Binding or not moving freely.
Switch has no definite stopping points or knob is broken or missing.