g. Remove/lnstall. 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 a piece of equipment or system.
h. Replace. To remove an unserviceable item and install a serviceable counter-part 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
j. Overhaul. That maintenance effort (service or 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 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, see paragraph B-2.