Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
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 code of the SMR code.
Repair. The application of maintenance services (inspect, test, service, adjust, align, 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 part,
subassembly, module (component or assembly), end item, or system.
That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate
technical publications. Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to 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 RPSTL coincide.
Column 4, Maintenance Category. Column 4 specifies, by the listing of a "work 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 and the indicated category of
maintenance. If the number of 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 number of task-
hours specified by 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, troubleshooting time, and quality assurance/quality control time
in addition to the time required to perform the specific task identified for the maintenance functions authorized
in the maintenance allocation chart. Subcolumns of column 4 are as follows: