EXPLANATION OF COLUMNS IN THE MAC - TM-9-2320-361-24-21047

TM 9-2320-361-24-2

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MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION (Contd)

MAINTENANCE FUNCTIONS (contd)

Repair. The application of maintenance services, including fault location/troubleshooting,

removal/installation, disassembly/assembly procedures, and maintenance actions to identify

troubles and restore serviceability to an item by correcting specific damage, fault, malfunction, or

failure in a part, subassembly, module (component or assembly), end item, or system.

10.

Overhaul. The 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 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 Functional Group Code (FGC) numbers. The purpose of

FGC numbers is to identify maintenance significant components, 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 sub column. 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 be shown for each level. The work time figure represents the average time required to

restore an item 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.

Column 5 Tools and Equipment Reference Code. Column (5) specifies, by code, common tool sets

(not individual tools), common Test, Measurement and Diagnostic Equipment (TMDE), and

special tools, special TMDE, and special support equipment required to perform the

designated function. Codes are keyed to the entries in the tools and test equipment table.

Column 6 Remarks Code. When applicable this column contains a letter code, in alphabetic order,

which is keyed to the remarks table entries.

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