TM 10-4610-237-12
B.2 MAINTENANCE FUNCTIONS - Continued.
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 3rd position code 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
(i.e., 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 material
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 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 numbers are "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 a detailed explanation of these functions, see paragraph B.2.)
d.
Column 4. Maintenance Level. Column 4 specifies, by the listing of a work time figure (expressed as man-
hours shown as whole hours or decimals) 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 the complexity of the tasks within
the listed maintenance function vary 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 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 system designations for the various maintenance levels are shown below.
C ........Operator or Crew
O........Unit Maintenance
F........Direct Support Maintenance
H ........General Support Maintenance
D ........Depot Maintenance
B-2
