B-2. MAINTENANCE FUNCTIONS - continued.
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 services1 including fault location/troubleshooting2,
removal/installation, and disassembly/assembly3s procedures, and maintenance actions4 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.
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.
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.
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 numbers shall be 00.
Column 2, ComponentJAssembly. 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 a detailed explanation of these functions, see paragraph B-2).
1 Services - inspect, test, service, adjust, aline calibrate, and/or replace.
2 Fault locate/troubleshoot - The process of investigating and detecting the cause of
equipment malfunctioning; the act of isolating a fault within a system or unit under test (UUT).
3 Disassembly/assembly - encompasses the step-by-step taking apart (or breakdown) of a
spare/functional group coded item to the level of its least componency identified as maintenance
significant (i. e., assigned an SMR code) for the category of maintenance under consideration.
4 Actions - welding, grinding, riveting, straigtening, facing, remachinery, and/or resurfacing.