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Page Title: B-3. EXPLANATION OF COLUMNS IN THE MAC
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ARMY TM 9-4120-381-14 NAVY EE-000-CA-MMA-010/7053-AC AIR FORCE TO 35E9-136-31 i. Repair.  The application of maintenance services1 including fault location/troubleshooting2, removal/installation, and 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 serviceable/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   materiel 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 with the next higher assembly.  End item group number shall be "00". 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,  by  the  listing  of  a  work  time  figure  in  the  appropriate subcolumn(s).  The level of maintenance authorized to perform the function listed in Column 3.  This figure represents the active time required to perform the 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 will be shown for each.  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 time (including any necessary assembly time), troubleshooting/fault location time, and quality assurance/quality control time in addition to the time required to perform the specific tasks identified for the maintenance functions authorized in the maintenance allocation chart.  The designations for the various maintenance levels are as follows: C ...........  Operator or Crew O ...........  Unit Maintenance F ...........  Direct Support Maintenance H ...........  General Support Maintenance D ...........  Depot Maintenance e. Column 5, Tools and Equipment.  Column 5 specifies, by code, those common tool sets (not individual tools) and special tools, TMDE, and support equipment required to perform the designated function. f. Column 6, Remarks.  This column shall, when applicable, contain a letter code, in alphabetical order, which shall be keyed to the remarks contained in Section IV. 1  Services - Inspect, test, service, adjust, align, calibrate, and/or replace. 2  Fault location/troubleshooting - The process of investigating and detecting the cause of equipment malfunctioning; the act of isolating a fault within a system or unit under test (UUT). 3  Disassembly/assembly - encompasses the step-by-step taking apart (or breakdown) of a spare/functional group coded item  to  the  level  of  its  least  componency  identified  as  maintenance  significant  (i.e.,  assigned  an  SMR  code)  for  the category of maintenance under consideration. 4  Actions - Welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing. B-2

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