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Page Title: EXPLANATION OF COLUMNS IN THE MAC-SECTION II
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TM 10-4930-240-13 B-2.  MAINTENANCE FUNCTIONS-cont g. Remove/Install.    To  remove  and  install  the  same  item  when  required  to  perform  service  or  other maintenance  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. h. Replace.    To  remove  an  unserviceable  item  and  install  a  serviceable  counterpart  in  its  place. "Replace" is authorized by the MAC and is shown as the 3rd position code of the SMR code. i. Repair.        The    application    of    maintenance    services,    including    fault    location/troubleshooting, removal/installation,  and  disassembly/assembly  procedures,  and  maintenance  actions  to  identify troubles,  and  restore  serviceability  to  an  item  by  correcting  specific  damage,  fault,  malfunction,  or failure in 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  completely serviceable/operational  condition  as  required  by  maintenance  standards  in  appropriate  technical publications (1 e, DMWR).  Overhaul is normally the highest degree of maintenance performed by the Army.  Overhaul does not normally return an item to like new condition. k. Rebuild.  Consists of those services/actions necessary for the restoration of unserviceable equipment to a like new condition in accordance with original manufacturing standards.  Rebuild is the highest degree of material maintenance applied to Army equipment.  The rebuild operation includes the act of  returning  to  zero  those  age  measurements  (hours/miles,  etc.)  considered  in  classifying  Army equipment/components. B-3.  EXPLANATION OF COLUMNS IN THE MAC-SECTION II. a.  Column 1, Group Number.  Column 1 lists functional group code numbers, the purpose of which is to identify maintenance significant components, assemblies, subassemblies, and modules with the next higher assembly End item group numbers are "00". b.  Column   2,   Component/Assembly.      Column   2   contains   the   names   of   components,   assemblies, subassemblies, and modules for which maintenance is authorized. c.   Column 3, Maintenance Function.  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.  Column 4, Maintenance Level.  Column 4 specifies, by the listing of a work time figure (expressed as man-hours   shown   as   whole   hours   or   decimals)   in   the   appropriate   subcolumn(s),   the   level   of maintenance authorized to perform the function listed m Column (3).  This figure represents the active time  required  to  perform  that  maintenance  function  at  the  indicated  level  of  maintenance.    If  the number   or   the   complexity   of   the   tasks   within   the   listed   maintenance   function   vary   at   different maintenance levels, appropriate work time figures 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  field  operating  conditions.    This  time includes  preparation  item  including  any  necessary  disassembly/assembly  time),  troubleshooting/fault location time, and quality assurance/quality control time in addition to the time required to perform the specific tasks B-2

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