Repair. The application of maintenance services, including fault location/troubleshooting,
removal/installation, and disassembly/assembly procedures, and maintenance actions 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. 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." The order of the equipment tasks is consistent with the
Logistic Control Number (LCN) sequence.
b. 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, refer to paragraph B-2).
Column 4, Maintenance Level. Column 4 specifies, by the listing of a work time figure In the
appropriate subcolumn(s), the level 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 level of
maintenance. If the number or complexity of the tasks within the listed maintenance function vary at different
maintenance levels, appropriate work time figures will be shown for each level. 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 undertypical 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 levels are as follows:
Operator or Crew
Direct Support Maintenance
General Support Maintenance
Column 5, Tools and Equipment . Tools and tool kits are listed in "item" numeric sequence in
Section III. Chapters 3 through 6 identify specific tools for each procedure. National Stock Numbers for each
item are, also, listed in Section III.
Column 6, Remarks. This column shall, when applicable, contain a letter code, in alphabetic
order, which shall be keyed to the remarks contained in Section IV.