CHAPTER 2. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

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