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 TM 55-1905-242-14
THEORY OF OPERATION
This work package contains the theory of operation for the system. Theory of operation is provided to familiarize the
user system operating principles. Once the operating principles are understood, the user is better equipped to operate,
troubleshoot, and maintain the system.
DESCRIPTION AND USE OF OPERATOR CONTROLS AND INDICATORS
This work package describes all of the operator controls and indicators contained in the system. Use of the operator
controls and indicators is also described. Turn to the figure that shows the desired control or indicator. Note the key
number corresponding to the control or indicator. Refer to the table below the illustration and find the desired key
number in the column on the far left hand side. The center column contains the name of the control or indicator and the
right hand column briefly describes the control or indicator's function.
OPERATOR INSTRUCTIONS
Work packages are included in this manual to describe the operation under the usual conditions as well as operation
under unusual conditions. Prior to performing any operating procedure, perform the initial setup by obtaining the
expendables, tools, materials and other items listed prior to starting the task. Always perform the listed steps in the
listed order.
TROUBLESHOOTING PROCEDURES
A troubleshooting index work package is contained in this manual to permit easy location of troubleshooting procedures.
Full directions for using the troubleshooting index and the accompanying troubleshooting procedures are contained in
the troubleshooting index work packages. The troubleshooting procedure work package(s) immediately follow the
troubleshooting index.
MAINTENANCE PROCEDURES
To locate a maintenance procedure, consult the table of contents or the alphabetical index. Each level of maintenance
(operator, unit, direct support, and general support) has a chapter dedicated to maintenance procedures for the
appropriate level of maintenance. Each maintenance work package contains complete maintenance procedures, starting
with initial setup and continuing through follow on service as appropriate. Always ensure that all of the initial setup is
complete before beginning a maintenance procedure and always ensure that all warnings, cautions, and notes are
heeded.
MAINTENANCE ALLOCATION CHART
The MAC lists all of the authorized maintenance for the system and assigns that maintenance to the appropriate
maintenance level (operator, unit, direct support, general support). Use of the MAC is explained fully in the
Maintenance Allocation Chart Introduction work package.
ALPHABETICAL INDEX
The Alphabetical Index, located in the back of this manual, contains an alphabetical list of all sections of this manual.
The work package sequence number is found on the right side of the title where the Location and Description of Major
Components is located. Turn to the work package indicated to find the description and location of each component.
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