TM 11-5985-355-13
Table 4-1. Organizational Preventive Maintenance Checks and Services - Quarterly Schedule
ITEM
ITEM T0
NO.
BE INSPECTED
PROCEDURES
1
All components required to make the AS2731/GRC operational are on hand (appx
B) or are available.
2
Publications
TM 11 -5985-355-13 & TM 11-5985 355-13P are on hand with latest
changes- see DA Pam 310-4 for current publication listing.
3
Modifications
Check DA Pam 310-7 to see if any modification work orders (MWO's) are lis ted
for the AS-2731/GRC or its components. All URGENT MWO's must be applied
immediately; all NORMAL MWO's must be scheduled.
4
Metal surfaces
Remove rust, corrosion, and fungus; spot-paint bare metal spots (para 4-4a).
5
Mounting bolts
The mounting bolts that attach the MX-9146/GRC to the vehicle are no more than
snug-tight (100 (fig. '24) inch-pounds, maximum).
6
Control recep-
Apply a small amount of silicone compound (item 3, app E) to the outer shell of
tacle J2
J2 (to facilitate cable installation).
(fig. 2-3)
7
A.2732/GRC
a. The tip is not worn so that the metal inside can be seen.
b. At the bottom, check to see that center contact SM-B-524007 is level with the
(fig. C 1)
top curve of spring contact SNM-B-524008; and that spring contact SM-B-524008
is curved and held by its two screws MS51987-1. Replace defective contact or
missing screws (para 4-7b).
c. Using a screwdriver or similar instrument, press down contact SM-B-524007
several times; the contact should spring back each time.
d. Check to see that ring SM-B-889201 is screwed in fully; use a needle-nosed
pliers or spanner wrench to screw in the ring.
8
Tuning switch
Tune the associated radio and observe that tuning switch S1 rotates to the
S1 operation
position that includes
the following tuning switch positions:
Tune -radio to MHz
Tuning switch S1 position
(fig 2-3;
item 2,
31.00
30-33
35.00
33-37
40.00
3742
45.00
4247.5
50.00
47.5-52
55.00
53-56
58.00
56-60
62.00
60-65
68.00
65-70.5
72.00
70.5-76
NOTE
If switch S1 consistently points to the frequency band opposite the required
position, loosen the switch knob, position the white indicator to the proper fre-
quency band, and tighten the knob screw.
9
MX-9146/GRC
a. Inspect the plastic top section (fig. 2-2) for cracks that appear large enough to
allow water or moisture to enter the unit.
NOTE
Hairline cracks or paint on the plastic section is not a condition for replacing the
unit
b. Two setscrews SM-D-889199-1 and the cap screw SM-B-889207 (fig. 2-2)
with the dust cover SM-C-889230-3 are in place.
c. The dust caps for connector J1 and J2 (fig. 2-3) are in place and not
damaged.
d. Inspect RF connector J1 and control connector J2 pins (fig. 2-3) for damage.
10
CX-10355/GRC
Inspect the cable and the connectors for damage.
CX-13184/GRC
4-6. Repair procedures: general
4-7.
Antenna Element AS-2732/GRC Re-
This section contains organizational maintenance
moval and Replacement
requirements for AS-2731/GRC. Those requirements
(fig.
2-2)
include removal and replacement, and testing after
a. Antenna Element.
repair.
(1) Remove safety lock wire between the
Change 2 4-2
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