TM 9-2330-390-14&PB-2.MAINTENANCE FUNCTIONS (Con't).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 third position of the SMR code.i .Repair. The application of maintenance services, including fault location/troubleshooting,removal/installation, and disassembly/assembly procedures and maintenance actions to Identify troubles andrestore 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 completelyserviceable/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 normallyreturn an item to like new condition.k.Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipmentto a like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materielmaintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those agemeasurements (hours/miles, etc.) considered in classifying Army equipment/components.B-3.EXPLANATION OF COLUMNS IN THE MAC, SECTION Il.a. Column(1)- GroupNumber. Column 1 lists functional group code numbers, the purpose of which isto identify maintenance significant components, assemblies, subassemblies, and modules with the next higherassembly. End item group number shall be "00."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 listedin Column 2. (For a detailed explanation of these functions, refer to paragraph B-2.)d. Column (4) - Maintenance Level. Column 4 specifies, by the listing of a work time figure in meappropriate subcolumn (s) the level of maintenance authorized to perform the function listed in Column 3. This figurerepresents the active time required to perform that maintenance function at the indicated level of maintenance. lithenumber or complexity of the tasks within the listed maintenance function vary at different maintenance levels,appropriate work time figures will be shown for each level. The work time figure represents the average time requiredto restore an Item (assembly, subassembly, component, module, end item, or system) to a serviceable conditionunder typical field operating conditions. This time includes preparation time (including any necessarydisassembly/assembly time), troubleshooting/fault location time, and quality assurance/quality control time inaddition to the time required to perform the specific tasks identified for the maintenance functions authorized in theMaintenance Allocation Chart. The symbol designations for the various maintenance levels are as follows:C. . . . Unit (Operator or Crew)O . . . . Unit MaintenanceF . . . . Direct Support MaintenanceH . . . . . General Support MaintenanceD . . . . . Depot Maintenancee.Column (5) - Tools and Equipment. Column 5 specifies, by code, those common tool sets (notindividual tools) and special tools, TMDE, and support equipment required to perform the designated function..B-2
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