TM 10-8340-220-23P SECTION VII. MAINTENANCE ALLOCATION CHART Part I.  INTRODUCTION 1. General a.    Part  I  provides  a  general  explanation  of  all maintenance  and  repair  functions  authorized  at  various maintenance levels. b.  Part II designates overall responsibility for the performance  of  maintenance  functions  on  the  identified end  item  or  components.    The  implementation  of  the maintenance functions upon the end item or component will     be     consistent     with     the     assigned     maintenance functions. c.  Part III.  Not Applicable. d.    Part  IV  contains  supplemental  instructions, explanatory    notes    and/or    illustrations    required    for    a particular maintenance function. 2. Explanation of Columns in Part II a.    Group  Number,  Column  (1).    The  assembly group is a numerical group assigned to each assembly in a    top    down    breakdown    sequence.        The    applicable assembly  groups  are  listed  on  the  MAC  in  disassembly sequence beginning with the first assembly removed in a top down disassembly sequence. b.    Assembly  Group,  Column  (2).    This  column contains  a  brief  description  of  the  components  of  each assembly 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 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   detect electrical or mechanical failure by use of test equipment. C-Service.    To  clean,  to  preserve,  to  charge,  to paint, and to add fuel, lubricants, cooling agents, and air. D-Adjust.    To  rectify  to  the  extent  necessary  to bring into proper operating range. E-Aline.  To adjust specified variable elements 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 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 with the certified standard. G-Install.    To  set  up  for  use  in  an  operational environment such as an emplacement, site, or vehicle. H-Replace.  To replace unserviceable items with serviceable assemblies, subassemblies, or parts. I-Repair.      To   restore   an   item   to   serviceable condition.  This includes, but is not limited to, inspection, cleaning, preserving, adjusting, replacing, welding, riviting, and strengthening. J-Overhaul.  To  restore  an  item  to  a  completely serviceable    condition    as    prescribed    by    maintenance serviceability   standards   using   the   Inspect   and   Repair Only as Necessary (IROAN) technique. K-Rebuild.  To restore an item to a  standard  as nearly    as    possible    to    original    or    new    condition    in appearance, performance, and life expectancy. This is accomplished through complete disassembly of the item, inspection of all parts or components, repair or replacement of worn or un- 16