EXPLANATION OF COLUMNS IN THE MAC, SECTION II

TM 5-5430-226-12

B-2. MAINTENANCE FUNCTIONS (Cont).

g. Remove/Install. To remove and install the same item when required to perform service or other maintenance

functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module (component

or assembly) in a manner to allow the proper functioning of an equipment or system.

h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place.

Replace is authorized by the MAC and is shown as the 3rd position code of the SMR code.

i. Repair. The application of maintenance services or other maintenance actions to 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.

j. 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 (i.e.,

DMWR). Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally

return an item to like new condition.

k. 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 and components.

B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II

a. Column 1 Group Number. Column I lists functional group code numbers, the purpose of which is to

identify maintenance significant components, assemblies, subassemblies, and modules with the next higher assembly.

b. Column 2 Component/Assembly.

Column 2 contains the names of components, assemblies,

subassemblies, and modules for which maintenance is authorized.

c. 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, see paragraph 1-2.)

d. Column 4 Maintenance Category. Column 4 specifies, by the listing of a work time figure in the

appropriate subcolumn(s), the category of maintenance authorized to perform the function listed in Column 3. This figure

represents the active time required to perform that maintenance function at the indicated category of maintenance. If the

number or complexity of the tasks within the listed maintenance function varies at different maintenance categories,

appropriate work time figures will be shown for each category. 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/quality control time in addition to

the time required to perform the specific tasks identified for the maintenance functions authorized in the maintenance

allocation chart. The symbol designations for the various maintenance categories are as follows:

B-2