TM 55-8115-200-23&P APPENDIX B MAINTENANCE ALLOCATION CHART Section   I.   INTRODUCTION B-1.  General. a. This section provides a general explanation of all maintenance and repair functions authorized at various maintenance levels. b. The  Maintenance  Allocation  Chart  (MAC)  in Section II designates overall responsibility for the performance of maintenance functions on the iden- tified end item or component. 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  special  tools  and  test equipment required for each maintenance function as referenced from Section II. d.  Section   IV   contains   supplemental   in- structions  on  explanatory  notes  for  a  particular maintenance  function. B-2.  Maintenance  Functions. a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or electrical   characteristics   with   established   stan- dards through examination. b. Test.  To  verify  serviceability  and  detect  in- cipient failure by measuring the mechanical or elec- trical  characteristics  of  an  item  and  comparing those characteristics with prescribed standards. c. 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 flu- ids, or compressed air supplies. d. Adjust.  To  maintain,  within  prescribed  lim- its, by bringing into proper or exact 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 per- formance. f.  Calibrate.   To   determine   and   cause   cor- rections 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  stan- dard  of  known  accuracy,  to  detect  and  adjust  any discrepancy in the accuracy of the instrument being compared. g. Install.  The act of emplacing, seating, or fix- ing  into  position  an  item,  part,  or  module  (com- ponent or assembly) in a manner to allow the proper functioning of an equipment or system. h.   Replace.   The  act  of  substituting  a  ser- viceable,  like  type  part,  subassembly,  or  module (component  or  assembly)  for  an  unserviceable  coun- terpart. i. Repair.  The  application  of  maintenance  ser- vices (inspect, test, service, adjust, align, calibrate, or replace) or other maintenance actions (welding, grinding,   riveting,   straightening,   facing,   re- machining, or resurfacing) to restore serviceability to an item by correcting specific damage, fault, mal- function, or failure in a part, subassembly, module (component or assembly), and item or system. j. Overhaul.  That maintenance effort (services/ actions)  necessary  to  restore  an  item  to  a  com- pletely   serviceable/operational   condition   as   pre- scribed by maintenance standards (i.e., DMWR) in appropriate  technical  publications.  Overhaul  is  nor- mally 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 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 equipments/components. B-3. Column Entries Used In The MAC. a.  Column  1,  Group  Number.  Column  1  lists group numbers, the purpose of which is to identify components,  assemblies,  subassemblies,  and  mod- ules with the next higher assembly. B-1