Explanation of Columns in the MAC - TM-5-4110-204-130067

TM 5-4110-204-13

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.

Explanation of Columns in the MAC

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 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 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 symbol designations for the various maintenance levels are as follows:

Field:

Operator or Crew maintenance

Unit maintenance

Direct Support maintenance

Sustainment:

Specialized Repair Activity

General Support maintenance

Depot maintenance

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