b. Test.    To  verify  serviceability  by  measuring  the mechanical, pneumatic, hydraulic, or electrical characteristics of an item and comparing those characteristics with prescribed standards. c. Service.        Operations    required    periodically    to keep an item in proper operating condition; e.g., to clean (includes decontaminate, when required), to preserve, to drain.  to paint, or to replenish fuel, lubricants, chemical fluids, or gases. d. Adjust. To maintain or regulate, within prescribed  limits,  by  bringing  into  proper  position,  or  by setting the operating characteristics to specified parameters. e. Align.    To  adjust  specified  variable  elements  of an item to bring about optimum or desired performance. f. Calibrate. To determine and cause corrections to be   made   or   to   be   adjusted   on   instruments   or   test, measuring,  and  diagnostic  equipment  used  in  precision measurement. Consists of comparisons of two instruments,   one   of   which   is   a   certified   standard   of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared. g. Removal/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 3d 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   (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  measurement  (e.g..    hours/miles)  considered in classifying Army equipment/components. B-3. Explanation of Columns in the MAC, Section II a. Column   I.      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. 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 13-2.) d. Column    4,    Maintenance    Level.        Column    4 specifies    each    level    of    maintenance    authorized    to perform each function listed in Column 3, by indicating a 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  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   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   maintenance   allocation   chart.      The symbol  designations  for  the  various  maintenance  levels are as follows: C Operator or crew maintenance O Organizational maintenance F Direct support maintenance L Specialized Repair Activity (SRA) H General support maintenance D Depot maintenance e. Column 5, Tools and Test Equipment Reference Code.  Column 5 specifies, by code, those common tool sets (not individual tools), common TMDE, special tools, special  TMDE,  and  special  support  equipment  required to perform the designated function.  Codes are keyed to tools and test equipment in Section III. f. Column   6,   Remarks.      When   applicable,   this column   contains   a   letter   code,   in   alphabetical   order, which is keyed    to    the    remarks    contained    in .Section IV. 22