Repair. The application of maintenance services1 including fault location/troubleshooting2,
removal/installation, and disassembly/assembly3 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), and 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 in 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 service/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 and 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
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 )
1Service - Inspect, test, service, adjust, aline, calibrate, and/or replace
2Fault location troubleshooting - The process of investigating and detecting the cause of equipment
malfunc- tioning; the act of isolating a fault within a system or unit under test (UUT).
3Disassembly/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 as SMR code for the level of maintenance under
consideration (i.e., identification as maintenance significant).
4Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.