TM 9-4520-257-12&P 0041 00
7. 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 function of equipment
8. Replace. To remove an unserviceable item and install a serviceable counterpart in its place. A
replacement is authorized by the MAC and is shown as the 3rd position code of the SMR code.
9. Repair. To perform maintenance services including fault location/troubleshooting,
removal/installation, and disassembly/assembly procedures. Also, to perform 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, or system.
The following definitions are applicable to the repair maintenance function:
Services Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault location/troubleshooting -The process of investigating and detecting the cause of
equipment malfunctioning; the act of isolating a fault within a system or Unit Under Test
Disassembly/assembly The step-by-step breakdown (taking apart) of a spare/functional
group-coded item to the level of its least component that is assigned an SMR code for the
level of maintenance under consideration (such as one identified as maintenance significant).
Actions Welding, grinding, riveting, straightening, facing, machining, and or resurfacing.
10. Overhaul. To perform the maintenance effort (service/action) prescribed to restore an item to a
completely serviceable/operational condition as required by maintenance standards in appropriate
technical publications (such as the DMWR). Overhaul is normally the highest degree of maintenance
performed by the Army. Overhaul does not normally return an item to like-new condition.
11. Rebuild. To perform 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 (such as hours/miles) considered in classifying Army equipment and/or
EXPLANATION OF COLUMNS IN THE MAC
Column (1) Group Number. Column 1 contains the functional group code numbers, the purpose of
which is to identify maintenance significant components, assemblies, subassemblies, and modules with
the next higher assembly.
Column (2) Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.