Repair: The application of maintenance services (inspect, test, service, adjust, align, calibrate, or replace) or other
maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to 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) necessary
serviceable/operational condition as prescribed by maintenance standards (i.e. DMWR) in appropriate technical
publications. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not
normally return an item to like new condition.
COLUM4Q ENTRIES: Columns used in the MAC and entries for these columns are explained below:
Column 1: Group Number: Column 1 lists group numbers, the purpose of which is to identify components,
assemblies, subassemblies, and modules with the next higher assembly.
Column 2: Component Assembly: Column 2 contains the noun names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column 3: Maintenance Functions: Column 3 lists the functions to be performed on the item listed in Column 2.
Column 4: Maintenance Category: Column 4 specifies, by the listing of a "work time", figure in the appropriate
sub column(s) the lowest level of maintenance authorized to perform the function listed in Column 3. This figure
represents the active time required to perform the maintenance function at the indicated category of maintenance.
If the number or complexity of the tasks within the listed maintenance function vary at different maintenance
categories, appropriate "work time" figures will be shown for each category. The number of man-hours specified
by the "work time" figure represents the average time required to restore an item (assembly, subassembly,
component, module, and item, or system) to a serviceable condition under typical field operating conditions. This
time includes preparation time, troubleshooting time, and quality assurance/quality control time in addition to the
time required to perform the specific tasks identified for the maintenance functions authorized in the MAC.