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
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