f. Inspect all exposed cables
blower vent, and air vent covers. Use oil
strains, moisture, fungi, loose
(PL special or OE-10).
and for frayed, cut, or damaged
c. Lubricate all metal-to-metal moving
g. Tighten loose mounting
Caution: More frequent lubrication may
30. Weekly Preventive Maintenance
be required for items listed above in ex-
cessively hot, humid, or dusty areas. Do
a. Clean and tighten the components,
racks, mountings, installations, cables,
d. Remove the shelter air filter and
soak it in cleaning compound, benzine, or
b. Inspect the components,. racks,
naphtha. Shake loose dirt from the air
mountings, installations, and exposed met-
filter, air-dry it, and replace it in its
al surfaces for rust, corrosion, and mois-
e. Check the fire extinguishers (fig.
c. Inspect the cables and wires for cuts,
13 and 14) for
a broken wire seal
trigger mechanism. If the extinguisher
has been used, or if there are any signs of
d. Inspect for looseness of accessible
leakage, request that it be recharged by
items, such as component switches, circuit
breaker switches, signal and ac cable as-
semblies, and glowlamps.
32. Equipment Performance Checklist
e. Clean the air fi1ter, nameplates,
meters, and clock.
The equipment performance checklist is
f. Inspect meters and clock for damaged
used to systematically check the AN/MSC-
glass and cases.
31. Only first echelon maintenance correc-
g. Wind the clock (fig. 13).
tive measures are given in the Corrective
h. Inspect the shelter for support, in-
measures column. If the corrective meas-
stallation, rust, corrosion, and moisture.
ures given do not correct the fault, re-
i. Check the entrance boxes, exhaust
quest higher echelon maintenance. When
blower vents, and air filter intake for
using the checklist, start at the beginning
cracks, leaks, damaged gaskets, dirt, and
and follow each step consecutively. If the
trouble is suspected in a particular area,
j. Check for normal operation.
start checking at that point and continue
the steps sequentially. Refer to the power
31. Monthly Preventive Maintenance and Lu-
schematic-wiring diagram (fig. 37) when
checking the S-183/MSC-31 ac circuits.
When a fault or trouble is located in a
a. Lubricate locks and l a t c h es. Use
major component item, refer to the appli-
Grease, Graphite, Aircraft MIL-G-7187
cable technical manual (appx I). First
echelon repair procedures are given in
b. Lubricate the hinges on the shelter
door and on the entrance boxes, exhaust