g. Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of replacing, 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.
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 3rd position code in the SMR code.
i. Repair. The application of maintenance services2, including fault location/troubleshooting3 removal/
installation, and disassembly/assembly4 procedures, and maintenance actions5 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.
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
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.
EXPLANATION OF COLUMNS IN THE MAC, SECTION III
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.)
Services - inspect, test, service, adjust, aline, calibrate, and/or replace.
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).
Disassemble/assemble - 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 SMR code) for the
category of maintenance under consideration.
Actions - welding, grinding, riveting, straightening, facing, remachinery, and/or resurfacing.