TM 10-4320-303-13B.2.7 Remove/Install.To remove and install the same item when required to perform service or othermaintenance functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part,or module (component or assembly) in a manner to allow the proper functioning of an equipment or system.B.2.8 Replace.To remove an unserviceable item and install a serviceable counterpart in its place. "Replace"is authorized by the MAC and assigned maintenance level is shown as the 3d position code of the SMR code.B.2.9 Repair. The application of maintenance services1, including fault location/troubleshooting2,removal/installation, and disassembly/assembly3 procedures, and maintenance actions4 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.B.2.10 Overhaul.That maintenance effort (service/action) prescribed to restore an item to a completelyserviceable/operational condition as required by maintenance standards in appropriate technical publication(i.e., DMWR). Overhaul is normally the highest degree of maintenance performed by the Army. Overhauldoes not normally return an item to like new condition.B.2.11 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 ofmateriel maintenance applied to Army equipment. The rebuild operation includes the act of returning to zerothose age measurement (e.g., hour/miles) considered in classifying Army equipment/components.B.3 EXPLANATION OF COLUMNS IN THE MAC, SECTION II.B.3.1 Column1,GroupNumber.Column 1 lists functional group code numbers, the purpose of which is toidentify maintenance significant components, assemblies, subassemblies, and modules with the next higherassembly.B.3.2 Column2,Component/Assembly. Column 2 contains the item names of components, assemblies,subassemblies, and modules for which maintenance is authorized.B.3.3 Column3,MaintenanceFunction .Column 3 lists the functions to be performed on the item listed inColumn 2. (For detailed explanation of these functions, see paragraph B.2.)B.3.4 Column4,MaintenanceLevel.Column 4 specifies each level of maintenance authorized to performeach function listed in Column 3, by indicating work-time required (expressed as manhours in whole hours ordecimals) in the appropriate subcolumn. This work-time figure represents the active time required to performthat maintenance function at the indicated level of maintenance. If the number or complexity of the taskswithin the listed maintenance function vary at different maintenance levels, appropriate work-time figures are tobe 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 typicalfield operating conditions. This time includes preparation time (including any necessary disassembly/assemblytime), troubleshooting/fault1 Services - inspect, test, service, adjust, align, calibrate, and/or replace.2 Fault location/troubleshooting - The process of investigating and detecting the cause of equipmentmalfunctioning; the act of isolating a fault within a system or unit under test (UUT).3 Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional group codeditem to the level of its least component that is assigned an SMR code for the level of maintenance underconsideration (i.e., identified as maintenance significant).4 Actions - welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.B-2
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