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 3d 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 trouble 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 like
new condition in accordance with original manufacturing standars. Rebuild is the highest degree of materiel
maintenance applied to Army equipment. The rebuild operation include 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
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 shall be 00.
b. Column 2. Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
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).
d. Column 4. Maintenance Level. Column 4 specifies, by the listing to 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 the function listed in indicated level of maintenance. If the number
or 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 and 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 levels are as follows:
Operator or crew
Intermediate Direct Support Maintenance
Intermediate General Support Maintenance
Column 5, Tools and Equipment. Column 5 specifies by code, those common tools sets (not individual
tools) and special tools, TM DE, and support equipment required to perform the designated function.