TM 10-4930-204-13h.Replace.The act of substituting a serviceable-like typepart, subassembly, or module (component or assembly) for an unservice-able counterpart.i.Repair.The application of maintenance services (inspect,test, service, adjust, align, calibrate, or replace) or other mainten-ance actions (welding, grinding, riveting, straightening, facing, re-machining, or resurfacing) to restore serviceability to an item bycorrecting specific damage, fault, malfunction, or failure in a part,subassembly, module (component or assembly), and item, or system.j.Overhaul.That maintenance effort (services/actions) neces-sary to restore an item to a completely serviceable/operational condi-tion as prescribed by maintenance standards (i.e., DMWR) in appropri-ate technical publications.Overhaul is normally the highest degreeof maintenance performed by the Army.Overhaul does not normallyreturn an item to like new condition.k.Rebuild.Consists of those services/actions necessary forthe restoration of unserviceable equipment to a like new condition inaccordance with original manufacturing standards.Rebuild is thehighest degree of material maintenance applied to Army equipment.The rebuild operation includes the act of returning to zero thoseage measurement (hours/miles, etc.) considered in classifying Armyequipments/components.D-3.COLUMN ENTRIES USED IN THE MAC.a.Column1,GroupNumber.Column 1 lists group numbers, thepurpose of which is to identify components, assemblies, subassemblies,and modules with the next higher assembly.b.Column2,Component/Assembly.Column 2 contains the namesof components, assemblies, subassemblies and modules for whichmaintenance is authorized.c.Column3,MaintenanceFunctions.Column 3 lists the func-tions to be performed on the item listed in column 2.(For detailedexplanation of these functions, see paragraph D-2.)d.Column4,MaintenanceLevel.Column 4 specifies, by thelisting of a “work time” figure in the appropriate subcolumn(s), thelowest level of maintenance authorized to perform the function listed in column 3.This figure represents the active time required to per-form the maintenance function at the indicated level of maintenance.If the number or complexity of the tasks within the listed mainten-ance functions vary at different maintenance levels, appropriate “work,time” figures will be shown for each level. The number of manhoursspecified by the “work time” figure represents the average time re-quired to restore an item (assembly, subassembly, components, module,end item, or system) to a serviceable condition under typical fieldoperating conditions.This time includes preparation time, trouble-shooting time, and quality assurance/quality control time in additionto the time required to perform the specific tasks identified for themaintenance functions authorized in the maintenance allocation chart.D-2
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