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 o-ring is present.

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 o-ring is missing.

Binding, not moving freely or too loose.

Binding or not moving freely.

Switch has no definite stopping points or knob is broken or missing.

6-3

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ATN ATN NVM14 manual Preventive Maintenance Checks and Services for ATN NVM-14