SCOPE

TM 115820890-20-3

1.2 SCOPE

This "Unit Level Maintenance Handbook, " TM 20-3 contains troubleshooting guides

and selected technical data applicable to SINCGARS ICOM Ground Radios,

AN/PRC-119A and AN/VRC-87A trough AN/VRC-92A. Abbreviated Troubleshooting

Guides (TSG) provide identical procedures to those found in TM 20-1. In general,

these guides tell the maintainer "what" needs to be done, but not "how." Cable

schematics and selected graphics offer the experienced unit maintainer additional

information on which to troubleshoot and replace or repair faulty components.

1.3 AVOIDING "FALSE PULLS"

A "False Pull" is what occurs when a component or LRU is identified as faulty and sent

to Direct Support Maintenance when in fact the item is operational. False Pulls hurt

your unit in several ways. A piece of equipment has been needlessly removed from

the unit, reducing mission readiness and operational capabilities. Also, replacing an

operational component with a like item did nothing to correct the problem which

started the maintenance action. And, importantly, the number of good components

needlessly sent to DS for maintenance can reflect positively or negatively on your unit

maintainers, as well as slowing down the repair process for actual failed components.

How can False Pulls be avoided? Recognizing the nature of electrical and electronic

component failures, it may not be possible to avoid ever experiencing a False Pull.

But, it is possible to avoid all but a few. Here is how. Follow some simple, straight

froward rules:

Don't guess; DO troubleshoot.

b. Don't rely on memory; DO use your Handbook or TM.

Don't chase symptoms; DO perform the Operational Check.

Don't "pull and push;" DO replace/repair the component identified by the

Operational Check or TSG.

Don't send replaced item to DS without double-checking; DO test LRU

again after replacement to verify that it is faulty.

1.4 MAINTENANCE FORMS, RECORDS, AND REPORTS

REPORTS OF MAINTENANCE AND UNSATISFACTORY EQUIPMENT. Department

of the Army forms and procedures used for equipment maintenance will be those

prescribed by DA Pam 738-750, as contained in Maintenance Management Update.

REPORTING OF ITEM AND PACKING DISCREPANCIES. Fill out and forward SF

364 (Report of Discrepancy [ROD]) as prescribed in AR 735-11-2/DLAR

4140.55/SECNAVINST 4355. 18/AFR 400-54/MCO 4430.3J.

TRANSPORTATION DISCREPANCY REPORT (TDR) (SF 361). Fill out and forward

TDR (SF 361) as prescribed in AR 55-38/NAVSUPINST 461 0.33 C/AFR 75-18/MCO

P4610.19/DLAR 4500.15.