TM 10-6640-225-13&Pi. Repair. The application of maintenance services 1including fault location/troubleshooting,2removal/installation, and disassembly/assembly procedures3 and maintenance actions4 to identifytroubles and restore serviceability to an item by correcting specific damage, fault, malfunction, or failurein 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 technicalpublications (i.e, DMWR). Overhaul is normally the highest degree of maintenance performed by theArmy. Overhaul does not normally return an item to like-new condition.k. Rebuild.Consists of those services/actions necessary for the restoration of unserviceableequipment to a like-new condition in accordance with original manufacturing standards. Rebuild is thehighest degree of materiel maintenance applied to Army equipment. The rebuild operation includes theact of returning to zero those age measurements (hours/miles, etc.) considered in classifying Armyequipment/components.B-3. Explanation Of Columns In The MAC, Section Il.a. ColumnI.GroupNumber. Column 1 lists functional group code numbers, the purpose of which isto identify maintenance significant components, assemblies, subassemblies, and modules with the nexthigher assembly. 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. Column3.MaintenanceFunction. Column 3 lists the functions to be performed on the item listedin column 2. (For a detailed explanation of these functions, see paragraph B–2.)d.Column4.MaintenanceCategory.Column 4 specifies, by the listing of a work time figure in theappropriate subcolumn(s), the category of maintenance authorized to perform the function listed incolumn 3. This figure represents the active time required to perform that maintenance function at theindicated category of maintenance. If the number or complexity of the tasks within the listed maintenancefunction vary at different maintenance categories, appropriate work time figures will be shown for eachcategory. 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 additionto 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 categories are asfollows:1 Services - inspect, test, service, adjust, align, calibrate, and/or replace.2 Fault locate/troubleshoot - the process of investigating and detecting the cause of equipment malfunctioning; the actof isolating a fault within a system or unit under test (UUT).3 Disassemble/assemble - encompasses the step-by–step taking apart (or breakdown) of a spare/function groupcoded item to the level of its least componency identified as maintenance significant (i.e., assigned an SMR code) forthe category of maintenance under consideration.4 Actions - welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.B - 2
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