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ARMY TM 9-6115-666-13&P
AIR FORCE TO 35C2-3-505-1
B.2.8.  Replace.  To remove an unserviceable item and install a serviceable counterpart in its place.
"Replace" is authorized by the MAC and is shown as the 3d position code of the SMR code.
The application of maintenance services1, including fault location/troubleshooting2,
removal/installation, and disassembly/assembly3 procedures, and maintenance actions4 to identify troubles and
restore serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part,
subassembly, module (component or assembly), end item, or system.
B.2.10. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical publication
(i.e., DMWR). Overhaul does not normally return an item to like new condition.
B.2.11. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment
to a like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of
materiel maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero
those age measurement (hour/miles, etc.) considered in classifying Army equipment/components.
B.3.1. Column 1, Group Number. Column I lists functional group code numbers, the purpose of which is to
identify maintenance significant components, assemblies, subassemblies, and modules with the next higher
assembly. End item group number shall be "00."
B.3.2.  Column 2, Component/Assembly.  Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
B.3.3. Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in
Column 2. (For detailed explanation of these functions, see paragraph B.2.)
B.3.4. Column 4, Maintenance Level.  Column 4 specifies, by the listing of a work time figure in the
appropriate subcolumn(s), the level of maintenance authorized to perform the function listed in Column 3. This
figure represents the active time required to perform that maintenance function at the indicated level of
maintenance. If the number or complexity of the tasks within the listed maintenance function vary at different
maintenance categories, appropriate work time figures will be shown for each category. The work time figure
represents the average time required to restore an item (assembly, subassembly, component, module, end
item, or system) to a serviceable condition under typical field operating conditions.  This time includes
preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location time, and
quality assurance/quality control time in addition to the time required to perform the specific tasks identified for
the maintenance functions authorized in the maintenance allocation chart. The symbol designations for the
various maintenance categories are as follows:
Services - inspect, test, service, adjust, align, calibrate, and /or replace.
Fault locate/troubleshoot - The process of investigating and detecting the cause of equipment malfunctioning;
the act of isolating a fault within a system or unit under test (UT).
Disassemble/assemble - encompasses the step-by-step taking apart or breakdown) of a spare/functional
group coded item to the level of its least componency identified as maintenance significant (i e., assigned an
SMR code)for the level of maintenance under consideration.
Actions - welding, grinding, riveting, straightening, facing remachinery, and /or resurfacing.


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