COMDTINST 4790.2B
a. Program Objective. The 2M/MTR Program is designed to improve equipment
Operational Availability (AO) and eliminate the turn-in of no failure evident (NFE) of
certain EMs and CCAs [hereafter referred to as Electronic Assemblies (EAs)], to the
depot. Additionally, the program provides technicians at the operational and
intermediate levels an additional tool to troubleshoot complex systems that do not have
adequate maintenance assist modules (MAMs) onboard, and the ability to screen and
repair faulty EAs if appropriate. Doing test and repair at the lowest level enhances ship
sustainability and helps to ensure optimum economic use of resources in achieving
maximum operational readiness.
b. Program Components. The program has two distinct components:
(1) The MTR Program develops and provides electrical/electronic module test and repair
capabilities to organizational (O-level) and intermediate (I-level) maintenance
facilities for both ashore and afloat commands. MTR involves screening suspected
faulty EAs to confirm the presence of a fault and then identifying the failed
component(s). This involves interpreting both the visual condition and electrical
characteristics of EAs and individual components and comparing the characteristics
of suspected faulty EAs with baseline characteristics stored in a locally accessible
database.
(a) Historically, even though there were highly trained personnel aboard most surface
ships and many shore facilities, the failed EAs were returned to depot sites for
repair. The MTR Program established dedicated, structured work centers to repair
these EAs at a significant cost reduction and increase in equipment up time. These
dedicated work centers are comprised of selected General Purpose Electronic Test
Equipment (GPETE), 2M-repair station, trained technicians from existing billeted
personnel, documentation, and reporting procedures.
(b) Major factors in the success of the MTR work center are the Huntron 2000,
AN/USM-646(V), and AN/USM-674(V) Test Stations. The Huntron 2000 works
by applying a current-limited AC signal across two points of a component that
provides a unique analog signature, which represents the overall health of the
device under test. The AN/USM-646/674(V) Test Stations are designed to be
used with an IBM compatible Personnel Computer (PC), which is part of the
GPETE and not counted as part of the microcomputer allowance. The test stations
are software driven by the PC and are capable of digitizing the analog signatures
for storage by the PC. This enables a technician to learn and save the signatures of
a good EA and utilize the stored information to fault isolate defective EAs. The
Navy's In Service Engineering Agent (ISEA) has developed the signature
diagnostic data, logistics information, schematic diagrams, and graphic assembly
drawings into a paperless software package labeled a "Gold Disk." A Gold Disk is
developed for each individual EA.
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