TM 9-4931-355-14
Section III. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
3-7. General.
b. Rubber Parts. Clean rubber parts using a mild
detergent and warm water. Dry the parts using a clean,
Preventive maintenance services include
absorbent wiping cloth.
cleaning, inspection, and paint touch-up procedures.
Such maintenance is performed at regular or
c. Glass.
unscheduled intervals to detect and correct conditions
CAUTION
which might cause the equipment to deteriorate and
Do not clean the glass surfaces on
degrade field performance or cause a field failure. The
front of the R/T tester or alinement
following subparagraph and table 3-2 contains
lens assembly with cloths or other
procedures and instructions necessary to perform
materials that might scratch the
organizational preventive maintenance checks and
surface.
services.
Use a camel hair brush to remove loose particles of dust
and lint from the glass surface. Then wipe the surface
3-8. General Cleaning Instructions.
in a circular motion using lens tissue (either dry or
The test set should always be kept clean. Otherwise
moistened with isopropyl alcohol).
performance may be degraded and obvious defect that
If dirt, lint, or smears remain on the glass, wrap a piece
would be noticed in a visual inspection may be hidden
of lens tissue around the end of an orange stick (or
by dust or other foreign matter.
equivalent) to form a swab. Beginning at the center of
WARNING
the surface, swab with a circular motion while applying a
Toluol
solvent
is
toxic
and
light downward pressure.
flammable. Use only in a well-
Gradually increase the radius of the area being cleaned
ventilated area. Avoid prolonged or
until the entire surface has been covered.
If necessary, use a rubber syringe to remove any
repeated breathing of vapor. Avoid
remaining dust or lint.
prolonged or repeated contact with
the skin.
3-9. Inspection.
Isopropyl alcohol is flammable.
Conduct a visual inspection of the test set as
Keep
all
flammable
cleaning
indicated in table 3-2 to make sure that all items are in
materials away from open flames.
good condition.
Replacement items should be
Failure to do so could result in injury
substituted for those found to be damaged or worn near
or death.
or beyond serviceable limits. Dirt, grease, and foreign
a. Metal Parts. Use dry, cotton wiping cloths to
matter should be removed from all inspected surfaces.
remove dust, dirt, grease, moisture, or other foreign
Preservatives and foreign matter should be removed
matter. If the foreign matter cannot be removed using
from electrical connectors. Areas where the paint is
dry wiping cloths, dampen a cloth with isopropyl alcohol
scratched, chipped, or worn should be repainted.
or solvent and gently wipe the area.
Table 3-2. Preventive Maintenance Checks and Services
Sequence
Item to be
Corrective action and/or
NO.
inspected
Procedure
paragraph reference
1
General Appearance
Check for accumulations of dirt, oil,
Clean.
grease, or other foreign matter.
Check for breaks, cracks, distortions,
Replace item.
or other evidence of damage.
Check interfaces for serviceability and
Replace item.
for evidence of damage or wear.
bent or broken connector pins.
Check for rust or corrosion and
Clean and spot (para 3-10. table 3-3).
missing, chipped or blistered paint.
(check for missing parts.
Replace item.
2
Equipment markings
Inspect for legibility.
Replace item.
3
Adapter, test
Check adapter for cleanliness and
Clean (table 3-31 and replace if
damage.
damaged.
Check for damaged inserts.
Replace inserts (para 4-6a)
Check for missing. chipped or
Clean and spot paint (para 3-10, table 3-3).
blistered paint.
3-2
Previous Page
