TM 9-2330-389-14&P
B-2.
MAINTENANCE FUNCTIONS (Con't).
h.
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 third position of the SMR code.
i.
Repair. The application of maintenance services, including fault location/troubleshooting, removal/
installation, and disassembly /assembly procedures, and maintenance actions 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.
j.
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
publications (e.g., DMWR). Overhaul is normally the highest degree of maintenance performed by the
Army. Overhaul does not normally return an item to like new condition.
k.
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 measurements (hours/miles, etc.) considered in classifying Army equipment/components.
B-3.
EXPLANATION OF COLUMNS in THE MAC, SECTION II.
a.
Column 1. Group Number. Column 1 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.
Column 2. Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies,
and modules for which maintenance is authorized.
c.
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, refer to paragraph B-2.)
d.
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 varies at different maintenance
levels, appropriate work-time figures will be shown for each level. 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 item (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 MAC. The symbol designations for the various maintenance levels are as follows:
C ........Operator/Crew
O ........Unit Maintenance
F .........Direct Support Maintenance
H ........General Support Maintenance
D ........Depot Maintenance
e.
Column 5. Tools and Equipment. Column 5 specifies, by code, those common tools sets (not individual tools)
and special tools, TMDE, and support equipment required to perform the designated function.
B-2
