i. Repair. The application of maintenance services, including fault location/troubleshooting,2
removal/installation, and disassembly/assembly procedures,3 and maintenance actions,4 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-new condition.
k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable
equipment to a likenew 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
Explanation Of Columns In The MAC, Section Il.
Column I. 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. 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 a detailed explanation of these functions, see paragraph B2.)
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
1 Servicesinspect, test, service, adjust, align, calibrate, and/or replace.
2 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).
3 Disassemble/assemble - encompasses the step-by-step taking apart (or breakdown) of a spare/functional group
coded item to the Ievel of its least componency identified as maintenance significant (i. e., assigned an SMR code) for
the category of maintenance under consideration.
4 Actions - welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.