11. 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. Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to like new condition.
12. 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 (e.g., hours/miles) considered in classifying Army
B-3. Explanation of Columns in the MAC, Section II
Column (1) Group Number. Column (1) lists Functional Group Code (FGC) numbers, the purpose of which
is to identify maintenance significant components, assemblies, subassemblies, and modules with the Next
Higher Assembly (NHA).
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 "Maintenance Functions" outlined
Column (4) Maintenance Level. Column (4) specifies each level of maintenance authorized to perform
each function listed in column (3), by indicating work time required (expressed as manhours in whole
hours or decimals) in the appropriate subcolumn. This work time 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 varies at different maintenance levels, appropriate work
time figures are to 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 under typical field operating conditions. This time includes preparation time (including any
necessary disassembly/assembly time), troubleshooting/fault location time, and quality assurance time in
addition to the time required to perform the specific tasks identified for the maintenance functions
authorized in the MAC. The system designations for the various maintenance levels are as follows:
Operator or Crew maintenance
Direct Support maintenance
Specialized Repair Activity
General Support maintenance