Repair. The application of maintenance services1,including fault location/troubleshooting2, removal/installation,
and disassembly/assembly procedures,3and maintenance actions4to 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 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 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 number shall be "00."
Column 2. ComponentlAssembly. 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.)
Column 4. Maintenance Category. Column 4 specifies, by the listing of a work time figure in the appropriate
subcolumn(s), the category of maintenance authorized to perform the function listed in column 3. This figure
represents the active time required to perform that 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 work time figure represents the average time
required to restore an item (assembly, subassembly, component, module, end item, or system) to a serviceable
condition under typical field operating conditions. This time includes preparation time (including any necessary
disassembly/assembly time), troubleshooting/fault location 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
maintenance allocation chart. The symbol designations for the various maintenance categories are as follows:
Services - inspect, test, service, adjust, align, calibrate, andlor 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/functiona/group
coded item to the level of its least componency identifies maintenance significant (ie., assigned an SMR code) for
the category of maintenance under considerati6n.
Actions - welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.