Table 4-1. Organizational Preventive Maintenance Checks and Services - Quarterly Schedule
All components required to make the AS2731/GRC operational are on hand (appx
B) or are available.
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.
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.
Remove rust, corrosion, and fungus; spot-paint bare metal spots (para 4-4a).
The mounting bolts that attach the MX-9146/GRC to the vehicle are no more than
snug-tight (100 (fig. '24) inch-pounds, maximum).
Apply a small amount of silicone compound (item 3, app E) to the outer shell of
J2 (to facilitate cable installation).
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
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.
Tune the associated radio and observe that tuning switch S1 rotates to the
position that includes
the following tuning switch positions:
Tune -radio to MHz
Tuning switch S1 position
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.
a. Inspect the plastic top section (fig. 2-2) for cracks that appear large enough to
allow water or moisture to enter the unit.
Hairline cracks or paint on the plastic section is not a condition for replacing the
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
d. Inspect RF connector J1 and control connector J2 pins (fig. 2-3) for damage.
Inspect the cable and the connectors for damage.
4-6. Repair procedures: general
This section contains organizational maintenance
moval and Replacement
requirements for AS-2731/GRC. Those requirements
include removal and replacement, and testing after
(1) Remove safety lock wire between the
Change 2 4-2