Explanation of Columns in the MAC - TM-9-4120-423-14-P0449

TM9 4120-423-14&P

10.

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.

11.

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 (e.g., hours/miles considered in

classifying Army equipment/components.

Explanation of Columns in the MAC

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 Assembly (NHA).

Column (2)

Component/Assembly. Column (2) contains the item 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 above.)

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 symbol designations for the various maintenance levels are as follows:

C - Operator or crew maintenance

O - Unit maintenance

F - Direct support maintenance

L - Specialized repair activity (SRA)

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