TM 11-5985-334-34
CHAPTER 2
D I R E C T SUPPORT MAINTENANCE INSTRUCTIONS
Section I. GENERAL
b. Providing support cooperator personnel when
2-1. General Maintenance Instructions
systems are operational. The equipment will remain
The maintenance procedures performed at direct
operational during this time. To lower the mast for
support are actions normally provided in response
inspection, provide an alternate mast and antenna.
to organizational support requests. Further, direct
Alternatively, the mast can be lowered for in-
support maintenance is designed to anticipate
spection when the radio set is nonoperational during
potential problem areas before they result in
periods such as:
equipment outage. The action to be taken depends
(1) When no operation is scheduled.
on the operational status of the unit involved and
(2) When the associated radio equipment is
consists principally of the following:
being repaired.
a. Providing support to installation teams during
(3) When modifications on the equipment are
erection of the mast.
being performed.
Section Il. TROUBLESHOOTING
2-2. General Instructions
stallation has been accomplished. Identification of a
problem by operator personnel will usually localize
Troubleshooting by direct support maintenance
the trouble to the defective assembly or unit. Refer
personnel is normally performed on problems
to table 2-1 to troubleshoot the AB-621(*)/G.
reported by operator personnel installing the an-
tenna mast or during visual inspection after in-
Table 2-1. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. MAST SWAYING.
Check for loose or damaged anchors.
Step 1.
Place a second anchor into ground beside the loose anchor and transfer guys to the second anchor.
Step 2.
Check for guy slackness.
Tighten guys.
Check tensioner slippage.
Step 3.
Replace guy assembly.
Step 4.
Check if launcher is solid on ground.
Tighten all guys. Reinstall the launcher on a soft earth base.
2. ANTENNA AZIMUTH SHIFTED.
Step 1.
Check for brake not set.
Readjust antenna azimuth and set brake.
Step 2.
Check for defective brake.
Repair brake (para 2-7).
3. WINCH SLIPS.
Step 1.
Check for damaged handle or hardware.
Replace handle or hardware (para 2-4).
2-1
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