APPENDIX C MAINTENANCE   ALLOCATION   CHART Section   I.   INTRODUCTION ARMY and USMC only C-1.   General. a.   This   section   provides   a   general   explanation   of all   maintenance   and   repair   functions   authorized   at various   maintenance   levels. b.   Section   II   designates   overall   responsibility   for the   performance   of   maintenance   functions   on   the identified  end  item  or  component.  The  implementa- tion  of  the  maintenance  functions  upon  the  end  item or  component  will  be  consistent  with  the  assigned maintenance   functions. c.  Section   III   lists   the   tools   and   test   equipment required   for   each   maintenance   function   as   refer- enced  from  Section  II. d.   Section   IV   contains   supplemental   instructions, explanatory   notes   and/or   illustrations   required   for a  particular  maintenance  function. C-2.   Explanation   of   Columns   in   Section   II. a.   Group   Number.   Column   1.   The   assembly group   is   a   numerical   group   assigned   to   each   assem- bly  in  a  top  down  breakdown  sequence.  The  appli- cable  assembly  groups  are  listed  on  the  MAC  in  dis- assembly   sequence   beginning   with   the   first   assem- bly  removed  in  a  top  down  disassembly  sequence. b.   Group   Title. Column   2.   This   column   contains a  brief  description  of  the   components   of   each   assem- bly  group. c.  Maintenance  Functions,  Column  3.  This column   lists   the   various   maintenance   functions   (A through   K)   and   indicates   the   lowest   maintenance category   authorized   to   perform   these   functions.   The symbol   designations   for   the   various   maintenance categories   are   as   follows C  -  Operator  or  crew O   -   Organizational   maintenance F  -  Direct  support  maintenance  (DS) H  -  General  support  maintenance  (GS) D  -  Depot  maintenance The   maintenance   functions   are   defined   as   follows A -  Inspect.    To   determine   serviceability   of   an item  by  comparing  its  physical,  mechanical,  and electrical    characteristics    with    established    standards. B -  Test.   To   verify   serviceability   and   to   de- tect   electrical   or   mechanical   failure   by   use   of   test equipment. C -  Service.   To  clean,  to  preserve,  to  charge, and   to   add   fuel,   lubricants,   cooling   agents,   and   air. If   it   is   desired   that   elements,   such   as   painting   and lubricating,   be   defined   separately,   they   may   be   so listed. D -  Adjust.   To   rectify   to   the   extent   necessary to   bring   into   proper   operating   range. E -  Align.   To   adjust   specified   variable   ele- ments  of  an  item  to  bring  to  optimum  performance. F   -   Calibrate.   To   determine   the   corrections to  be  made  in  the  readings  of  instruments  or  test equipment   used   in   precise   measurement.   Consists of  the  comparison  of  two  instruments,  one  of  which is   a   certified   standard   of   known   accuracy,   to   detect and  adjust  any  discrepancy  in  the  accuracy  of  the  in- strument   being   compared   with   the   certified   standard. G -  Install.   To  set  up  for  use  in  an  operational environment   as   an   emplacement,   site,   or vehicle. H -  Replace.   To   replace   unserviceable   items with  serviceable  like  items. I -  Repair.   Those   maintenance   operations necessary   to   restore   an   item   to   serviceable   condition through   correction   of   material   damage   or   a   specific failure.  Repair  may  be  accomplished  at  each  cate- gory   of   maintenance. J -  Overhaul.   Normally,   the   highest   degree   of maintenance  performed  by  the  Army  in  order  to  min- imize   time   work   in   process   is   consistent   with   quality and   economy   of   operation.   It   consists   of   that   main- tenance   necessary   to   restore   an   item   to   completely serviceable  condition  as  prescribed  by  maintenance standards   in   technical   publications   for   each   item   of equipment.   Overhaul   normally   does   not   return   an item   to   like   new,   zero   mileage,   or   zero   hour   condi- tion. K -  Rebuild.    The   highest   degree   of   material maintenance   consists   of   restoring   equipment   as nearly   as   possible   to   new   condition   in   accordance with   original   manufacturing   standards.   Rebuild   is performed   only   when   required   by   operational   consid- erations   or   other   paramount   factors   and   then   only   at the  depot  maintenance  category.  Rebuild  reduces  to zero   the   hours   or   miles   the   equipment,   or   component C-1