MAINTENANCE FUNCTIONS (Continued).
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC.
Repair. The application of maintenance services 1, including fault location/ troubleshooting2, removal/installation,
and disassembly/assembly 3, procedures, 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.
Overhaul. The 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 to 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 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/components.
EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
Column 1, Group Number. Column 1 lists functional group code number, the purpose of which is to identify
maintenance significant components, assemblies, subassemblies, and modules with the next higher assembly.
End item group numbers shall be "001".
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 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 tasks within a 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, 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 for the category
of maintenance under consideration.
Actions - welding, grinding, riveting, straightening, facing remachinery, and/or resurfacing.