Explanation of Columns in the MAC - TM-10-5411-233-13-P0279

TM 10-5411-233-13&P

CARGO BED COVER (CBC), TYPE III, 2 1/2 T CARGO TRUCK, LMTV, AND LMTV TRAILER

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MAINTENANCE ALLOCATION CHART (MAC)

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 (hours/miles, etc.) 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 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 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 system 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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