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Page Title: EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
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TM 10-4320-351-14 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 assigned maintenance level is shown as the third position code of the SMR code. i. Repair.  The application of maintenance services' including fault location/troubleshooting, removal/installation, disassembly/assembly3 procedures, and maintenance actions4 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  service- able/operational   condition   as   required   by   maintenance   standards   in   appropriate   technical   publications   (i.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 (e.g., hours/miles) 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 to the nest higher assembly. b. Column   2,   Component/Assembly.      Column   2   contains   the   item   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 detailed explanation of these functions, see paragraph B.2.) d. Column 4, Maintenance  Level.    Column  4  specifies  each  level  of  maintenance  authorized  to  perform  each function listed in column 3, by indicating work time required (expressed as man-hours in whole hours or decimals) in   the   appropriate   subcolumn.      This   work-time   figure   represents   the   active   time   required   to   perform   that maintenance  function  at  the  indicated  level  of  maintenance.    If  the  number  or  complexity  of  the  tasks  within  the listed  maintenance  function  vary  at  different  maintenance  levels,  appropriate  work-time  figures  are  shown  for each level.  The worktime 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  time  (condition/followon  tasks)(including  any  necessary  disassembly/assembly  time), troubleshooting/fault  location  time,  and  quality  assurance  time  in  addition  to  the  time  required  to  perform  the specific  tasks  identified  for  the  maintenance  functions  authorized  in  the  MAC.    The  symbol  designations  for  the various maintenance levels are as follows. 1Services - Inspect, test, service, adjust, align, calibrate, and/or replace. 2Fault location/troubleshooting - The process of investigating and detecting the cause of equipment malfunction.  The act of isolating a fault within a system or unit under test (UUT). 3Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional group coded item to the level of its  least  component  that  is  assigned  an  SMR  code  for  the  level  of  maintenance  under  consideration  (i.e.,  identified  as maintenance significant). 4Actions - Welding, grinding, riveting, straightening, facing, machining, and /or resurfacing. B-2

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