TM 10-4930-220-13&Ph.i.j.k.Replace. The act of substituting a serviceable like type part, subassembly, or module (component or as-sembly) for an unserviceable counterpart.Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, or replace)or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfac-ing) to restore serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part,subassembly, module (component or assembly), and item or system.Overhaul. That maintenance effort (service/actions) necessary to restore an item to a completely service-able/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate technicalpublications. Overhaul is normally the highest degree of maintenance performed by the Army. Overhauldoes not normally return an item to like new condition.Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment toa like new condition in accordance with original manufacturing standards. Rebuild is the highest degreeof material maintenance applied to Army equipment. The rebuild operation includes the act of returning toZero those age measurements (hours/miles, etc.) considered in classifying Army equipments/compo-nents.B-3. Column Entries.Columns used in the Maintenance Allocation Chart will be limited to those shown. Entries for those col-umns are explained below.a.b.c.d.Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify components,assemblies, subassemblies and modules with the next higher assembly.Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subas-semblies, and modules for which maintenance is authorized.Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in Col-umn 2. (For detailed explanation of these functions, see paragraph B–2)Column 4, Maintenance Category. Column 4 specifies, by listing a work time figure in the appropriatesubcolumn(s), the category of maintenance authorized to perform the functions listed in column 3. This fig-ure represents the active time required to perform that maintenance function at the indicated category ofmaintenance. If the number or complexity of the tasks within the listed maintenance function vary at differ-ent maintenance categories, appropriate work time figures will be shown for each category. The work timefigure represents the average time required to restore an item (assembly, subassembly, component, mod-ule, end item, or system) to a serviceable condition under typical field operating conditions. This time in-cludes preparation time (including any necessary disassembly/assembly time), troubleshooting/fault loca-tion time, and quality assurance/quality control time in addition to the time required to perform the specifictasks identified for the maintenance functions authorized in the Maintenance Allocation Chart. The symboldesignations for the various maintenance categories are as follows:COperator or CrewO ................................ Unit MaintenanceF . . . . . . . . . . . . . . . . . . . . . Direct Support MaintenanceH . . . . . . . . . . . . . . . . . . . . General Support MaintenanceD. . . . . . . . . . . . . . . . . . . . Depot MaintenanceB-2
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