reports are produced periodically for ships, repair
activities, unit commanders, and type commanders.
These automated reports include current ships main-
tenance project files, work requests, and preinspection
and survey deficiency listings.
Combat systems maintenance is based on a con-
cept of performing a comprehensive schedule of tests
at three mutually supporting levels: (1) combat sys-
tems, (2) subsystems, and (3) equipment. These
integrated tests are structured to challenge all combat
systems fictions, parameters, and characteristics on
a scheduled periodicity against specified tolerances.
Successful performance of the tests as scheduled
should provide a high level of confidence in the func-
tional operability of the combat systems equipment.
Integrated maintenance requirements are estab-
lished through engineering analysis based on the
study of all factors having a significant effect on
maintenance. The analysis defines system and equip-
ment functions and establishes tolerances in terms of
system parameters for determining acceptable system
operations. The integrated maintenance procedures are
intended to provide minimum preventive maintenance
coverage of combat systems. The procedures are writ-
ten to establish specific controlled conditions that
challenge the fictions under test. In some cases, test
efficiency and format restrictions make it difficult to
determine the intent of a test from its procedural
steps; therefore, the procedural sequences must be
followed explicitly. Improvising or shortcutting pro-
cedural sequences often leads to incorrect trouble-
shooting or masking of actual faults.
The integrated maintenance concept is consistent
with the PMS efforts, and it is the most effective
means of achieving the goals of the PMS. Adhering to
this concept enables maintenance managers to manage
the combat systems maintenance effort and to achieve
an optimum level of readiness with the most effective
use of available personnel.
With combat systems testing being conducted at
three levels, it is imperative that integrated main-
tenance tests be scheduled to reduce test redundancy
whenever possible. The three levels of tests are com-
bat systems testing, subsystems testing, and equip-
Combat Systems Testing
Combat systems testing, defined as testing that
exercises a combat system as one entity, is the highest
level of testing that can be accomplished aboard ship.
Combat systems tests are usually automated and are
conducted and monitored from the ships command
and control center.
The overall combat system operability test
(OCSOT) is the primary combat systems test tool.
The OCSOT gives a good overview of detection, dis-
play and tracking, designation, acquisition, repeat-
back position, and some status-signal monitoring.
Simulated targets are used in the OCSOT. Although
the test is conducted as if the combat systems were
operating normally, certain operating stations dedi-
cated to support the test are lost for normal opera-
Although the OCSOT provides an overview of
systems performance, it does not test the fill capacity
of a combat system or its subsystems operability. It is
impractical from an instrumentation and manpower
standpoint to test all functional test requirements at
the combat systems level. Therefore, confidence in
operability or material readiness is mainly dependent
on integrated testing at the subsystem and equipment
Testing that exercises two or more pieces of
equipment fictionally contained within the same
subsystem is defined as subsystems testing. Subsys-
tems testing tests a subsystem in a stand-alone opera-
tion; however, some functions are provided by other
subsystems, which require integrated testing.