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 equipment/components.
B-3. Explanation of Columns in the MAC, Section II.
Column (1) Group Number. Column (1) lists FGC numbers, the purpose of which is to identify
maintenance significant components, assemblies, subassemblies, and modules with the Next Higher
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 man-hours 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
Operator or Crew maintenance
Direct Support maintenance
Specialized Repair Activity
General Support maintenance