TABLE 4-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
SEQ.
NO.
ITEM TO
CHECK
CHECKING PROCEDURE
NOT FULLY
MISSION
CAPABLE IF:
BEFORE OPERATION CHECKS
1
Completeness
Inventory items by comparing them with the data
specified in this manual.
Items are missing.
2
Body
Inspect for cracks or damage. Scratches and
gouges are OK if operation is not affected. Inspect
for missing parts (purge screw, knobs).
Cracked or damaged.
Purge screw or knob
is missing.
3
Objective Lens
Cap
Inspect for cuts, tears and dirt. Clean as required.
Cap is torn or cut.
4
Output Lens Cap Inspect for dirt or O-ring damage. Clean as re-
quired.
Cap is not held up on
the lens housing.
5
Battery Compart-
ment / Cap with
Adapter
Check to make sure the adapter is present. Check
for corrosion, cap damaged or retainer breaks.
Check O-ring for cuts or damage.
Retainer is broken.
Cap, O-ring or
adapter is damaged or
missing.
6
Switch
Check for operation (without battery).
Switch is inoperative.
7
Lenses
Inspect for cleanliness, scratches, chips or cracks.
Clean as required.
Chipped or cracked.
Scratches hinder vi-
sion through the NM-
108 BC.
8
Photoreceiver
Inspect for cleanliness, scratches. Clean as re-
quired.
Photoreceiver is dam-
aged.
9
Focus Knob
Check to ensure there is free rotation through full
range of travel (1.5 turn).
Knob is inoperative.
10
Remote Control
Unit
Check for damage.
Check Velcro tape for wear.
Damaged. Unit or
tape is missing.
11
Light Suppressor Inspect for cuts or tears. Check ease of installation
and removal.
Light suppressor is
torn or cut.
12
Mount
Inspect for damage or corrosion, and for missing
parts. Check for proper operation.
Damaged. Some parts
are missing. Clamp-
ing device is inopera-
tive.
OPERATIONAL CHECKS
CAUTION:
The objective lens cap has an optical filter, which allows operational testing of the NM-108 BC
in daylight. Activate the NM-108 BC in daylight with the objective lens cap on or in dark
conditions.
NOTE:
Daylight checks are described below.
