The MDS data processing facilities collect, store,
and analyze maintenance information inputs into the
system to yield data concerning equipment
maintainability and reliability, manhours usage,
equipment alteration status, material usage and costs,
and fleet materiel condition. Various automated reports
are produced periodically for the ship, repair activities,
unit commanders, and type commanders. These
automated reports include a current ships maintenance
project file, work requests, and preinspection and survey
Combat system maintenance is based on a
comprehensive schedule of tests performed at three
mutually supporting levels: (1) combat system, (2)
subsystem, and (3) equipment. These integrated tests
are designed to test all combat system functions,
parameters, and characteristics periodically against
specified tolerances. Successful equipment
performance during the tests usually indicates that the
system is combat ready.
Integrated maintenance requirements are developed
through engineering analysis, based on a study of all
factors that significantly affect maintenance. The
analysis defines system and equipment functions, and
sets tolerances (in terms of system parameters) that
allow operators and technicians to determine whether or
not the system is operating properly.
Integrated maintenance procedures provide
minimum preventive maintenance coverage of the
combat system and are designed to test specific
functions under specific conditions. Sometimes
equipment operators and technicians may not
understand the purposes of the tests. However, they
must still follow the procedural sequence explicitly.
Improvising or shortcutting procedural sequences often
leads to incorrect troubleshooting or masking of actual
The integrated maintenance concept follows PMS
principles and is the most effective way to achieve PMS
goals. Adhering to this concept enables the SERT to
manage the combat system maintenance effort and
achieve an optimum level of readiness with the most
effective use of available manpower.
COMBAT SYSTEM TESTING
Combat system testing is conducted at three levels:
(1) combat system, (2) subsystem, and (3) equipment.
Integrated maintenance tests must be scheduled to
reduce redundancy wherever possible. The three levels
of testing are described in the following paragraphs.
Combat system testing exercises the entire combat
system. It is the highest level of testing that can be done
on board ship. Combat system tests are usually
automated and monitored in the combat direction
system (CDS) subsystem.
While these tests provide an overview of system
performance, they usually do not test the full capability
of the combat system. It is impractical, from an
instrumentation and manpower standpoint, to test all of
the functional requirements at the system level.
Therefore, confidence in operability or materiel
readiness is mainly dependent on integrated testing at
the subsystem or equipment level.
System-level tests provide a verification of the
alignment between sensors; on-line, real-time
monitoring of combat system interfaces; and an overall
test of the 3-D search radar and its interface with the
CDS. These tests are described in the synoptic test
descriptions in the CSTOM.
Subsystem testing exercises two or more pieces of
equipment functionally contained within the same
subsystem. The intent of subsystem testing is to test
(within the subsystem); but with the
need for integrated testing, some functions are tested
(outside of the subsystem).
The subsystem operability/readiness test is the
keystone of integrated subsystem testing. The
subsystem operability/readiness test consists of a rigidly
controlled sequence of steps designed to test all critical
functions during a primary mode of operation. The
subsystem operability/readiness test and a supporting
family of system tests use the concept of end-point
testing in which functions are stimulated at their
terminal point, thereby verifying all operations within
the function. Subsystem tests are functionally grouped
and mode-oriented so related functions may be tested
using the same setup, procedures, and stimuli.