Repair. The application of maintenance services (inspect, test, service, adjust, calibrate, replace) or other
maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to 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.
Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e., OMWR) in appropriate technical
publications. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not
normally return an item to a like-new condition.
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 equipments/components.
B-3. Column Entries
Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify components,
assemblies, subassemblies, and modules with the next higher assembly.
Column 2, Component/Assembly. Column 2 contains the noun names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column 3, Maintenance Functions. Column 3 lists the functions to be performed on the item listed in column 2.
When items are listed without maintenance functions, it is solely for the purpose of having the group numbers in the MAC
and Repair Parts and Special Tools List (RPSTL) coincide.
Column 4, Maintenance Category. Column 4 specifies, by the listing of a "wore time" figure in the appropriate
subcolumn(s), the lowest 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 category of maintenance. If the
number or complexity of the tasks within the listed maintenance function varies at different maintenance categories,
appropriate "work time" figures will be shown for each category. The 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, troubleshooting 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.
Subcolumns of column 4 are as follows:
O - Organizational
F - Direct support
H - General Support
D - Depot