TM 5-4310-452-14B-2.MAINTENANCE FUNCTIONS (Con't).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 equipment to a likenew 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 II.a. Column1,GroupNumber. Column 1 lists functional group code numbers, the purpose of which is to identifymaintenance significant components, assemblies, subassemblies, and modules with the next higher assembly. End itemgroup number shall be "00."b. Column2,Component/Assembly .Column 2 contains the names of components, assemblies, subassemblies,and modules for which maintenance is authorized.c. Column3,MaintenanceFunction .Column 3 lists the functions to be performed on the item listed in Column 2.(For a detailed explanation of these functions, see paragraph B-2.)d. Column4,MaintenanceLevel. Column 4 specifies, by the listing of a work time figure in the appropriatesubcolumn (s), the level of maintenance authorized to perform the function listed in Column 3. This figure represents theactive time required to perform that maintenance function at the indicated level of maintenance. If the number orcomplexity of the tasks within the listed maintenance function vary at different maintenance levels, appropriate work timefigures will 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 fieldoperating 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 performthe specific tasks identified for the maintenance functions authorized in the Maintenance Allocation Chart. The symboldesignations for the various maintenance levels are as follows:C...............................................Unit (Operator or Crew)O...............................................Unit Organizational MaintenanceF ...............................................Direct Support MaintenanceH...............................................General Support MaintenanceD...............................................Depot Maintenancee. Column5,ToolsandEquipment .Column 5 specifies, by code, those common tool sets (not individual tools)and special tools, TMDE, and support equipment required to perform the designated function.f. Column6,Remarks. This column shall, when applicable, contain a letter code, in alphabetic order, which shallbe keyed to the remarks contained in Section IV.B-4.EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS, SECTION III.a. Column1,ToolorTestEquipmentReferenceCode . The tool and test equipment reference code correlateswith a code used in the MAC, Section II, Column 5.b. Column2,MaintenanceLevel. The lowest level of maintenance authorized to use the tool or test equipment.B-2
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