TM     5-3895-376-14&P i. Repair. The application of maintenance serv- ices¹, including fault location / troubleshooting^2, re- moval/installation,    and    disassembly/assembly³ procedures and maintenance actions⁴ to identify trou- bles 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/ac- tion) prescribed to restore an item to completely serv- iceable/ operational condition as required by maintenance  standards  in  appropriate  technical  publi- cations (i.e., DMWR). Overhaul is normally the high- est  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 equip- ment to a like new condition in accordance with origi- nal 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., hour/miles) considered in classifying Army equip- ment/components. B-3. Explanation of Columns in the MAC, Section  II. a. Column 1, Group Number. Column 1 lists functional grouping codes, the purpose of which is to identify maintenance significant components, assem- blies, subassemblies, and modules with the next higher   assembly. b. Column 2, Component / Assembly. Column 2  contains  the  item  names  of  components,  assem- blies,  subassemblies,  and  modules  for  which  mainte- nance  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  func- tions, see Paragraph B-2.) d. Column 4, Maintenance Level. Column 4 specifies  each  level  of  maintenance  authorized  to  per- form each function listed in Column 3, by indicating work time required (expressed as manhours 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 work-time figure represents the average time required to restore an  item  (assembly,  subassembly,  component,  mod- ule, end item, or system) to a serviceable condition under typical field operating conditions. This time in- cludes preparation time (including any necessary dis- assembly/assembly    time),    troubleshooting/fault location time, and quality assurance time in addition to  the  time  required  to  perform  the  specific  tasks  Iden- tified for the maintenance functions authorized in the maintenance  allocation  chart.  The  symbol  designa- tions for the various maintenance levels are as fol- lows: C - Operator or crew maintenance O - Unit maintenance F - Direct support maintenance L - Specialized Repair Activity (SRA)⁵ H - General support maintenance D - Depot maintenance 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 malfunction- ing; the act of Isolating a fault within a system or unit under test (UT). 3 Disassembly/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). 4 Actions - Welding, grinding, riveting, straightening. facing, machining, and/or resurfacing. 5 This maintenance level IS not included in Section II, column (4) of the Maintenance Allocation Chart. Functions to this level of maintenance are identified by a work-time figure in the “H” column of Section II, column (4), and an associated reference code is used in the Remarks column (6). This code is keyed to Section IV, Remarks, and the SRA complete repair application is explained there. B-2