TM 5-6115-590-12 APPENDIX D MAINTENANCE ALLOCATION CHART Section I.  Introduction D-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    and    the    work measurement time required to perform the functions by the designated maintenance level.  The implementation 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 referenced from Section II. D-2.  Explanation of Columns In Section II a.     Column  (1),  Group  Number.    Column  1  lists group numbers to identify related components, assemblies,   sub-assemblies,   and   modules   with   their next higher assembly.  The applicable groups are listed in the MAC in disassembly sequence beginning with the first group removed. b.        Column    (2),    Component/Assembly.        This column    contains    the    noun    names    of    components, assemblies,    sub-assemblies    and    modules    for    which maintenance is authorized. c.       Column   (3),   Maintenance   Functions.      This column  lists  the  functions  to  be  performed  on  the  item listed   in   Column   2.      The   maintenance   functions   are defined as follows: (1)     Inspect.    To  determine  serviceability  of an item by comparing its physical, mechanical, and/or electrical    characteristics    with    established    standards through examination. (2)   Test.  To verify serviceability and detect incipient    failure    by    measuring    the    mechanical    or electrical   characteristics   of   an   item   and   comparing those characteristics with prescribed standards. (3)   Service Operations required periodically to keep an item in proper operating condition, i.  e.  , to clean  (decontaminate),  to  preserve,  to  drain,  to  paint, or   to   replenish   fuel,   lubricants,   hydraulic   fluids,   or compressed air supplies. (4)   Adjust.    To  maintain  within  prescribed limits,  by  bringing  into  proper  or  exact  position,  or  by setting   the   operating   characteristics   to   be   specified parameters. (5)   Align.        To    adjust    specified    variable elements    of    an    item    to    bring    about    optimum    or described performance. (6)   Calibrate.      To   determine   and   cause corrections to be made or to be adjusted on instruments to  test  measuring  and  diagnostic  equipments  used  in precision  measurement.    Consist  of  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 instrument being compared. (7)   Install.    The  act  of  emplacing,  seating, or    fixing    into    position    an    item,    part    or    module (component   or   assembly)   in   a   manner   to   allow   the proper functioning of an equipment or system. (8)   Replace.      The   act   of   substituting   a serviceable   like   type   part,   sub-assembly,   or   module (component or assembly) for an unserviceable counterpart. (9)   Repair.  The application of maintenance services  (inspect,  test,  service,  adjust,  align,  calibrate, or    replace)    or    other    maintenance    actions    (welding, grinding,  riveting,  straightening,  facing,  remachining  or resurfacing)   to   restore   serviceability   to   an   item   by correcting specific damage, fault, malfunction, or failure in     a     part,     sub-assembly,     module     (component     or assembly), end item, or system. (10) Overhaul.        That    maintenance effort (service/action) necessary to restore an item to a completely serviceable/operational condition as prescribed by maintenance standard (i.  e.  , DMWR) in appropriate technical publications.  Overhaul is normally the  highest  degree  of  maintenance  performed  by  the Army.  Overhaul does not normally return an item to like new condition. (11) 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     (hours/miles,     etc.     )     considered     in classifying army equipment/components. D-1