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Page Title: Appendix B. MAINTENANCE ALLOCATION CHART
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TM 10-4930-243-13&P Appendix B.  MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION B-1.  THE ARMY MAINTENANCE SYSTEM MAC. a.  This introduction (section I) provides a general explanation of all maintenance and repair functions authorized at various maintenance levels under the standard Army Maintenance System concept. b.  The Maintenance Allocation Chart (MAC) in section II designates overall authority and responsibility for the performance  of  maintenance  functions  on  the  identified  end  item  or  component.    The  application  of  the  maintenance functions   to   the   end   item   or   component   will   be   constant   with   the   capacities   and   capabilities   of   the   designated maintenance levels, which are shown in the MAC in column (4) as: Unit-includes two subcolumn, C (operator/crew) and O (unit) maintenance. Direct Support-includes an F subcolumn. General Support-includes an H subcolumn. Depot-includes an D subcolumn. c.    Section  III  lists  the  tools  and  test  equipment  (both  special  tools  and  common  tools  sets)  required  for  each maintenance function as referenced from section II. d.  Section IV contains supplemental instructions and explanatory notes for a particular maintenance function. B-2.     MAINTENANCE  FUNCTIONS.    MAINTENANCE  FUNCTIONS  WILL  BE  LIMITED  TO  AND  DEFINED  AS FOLLOWS: a.   Inspect.  To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical characteristics with established standards through examination (i.e., by sight, sound, or feel). b.     Test.    To  verify  serviceability  by  measuring  the  mechanical  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,  i.e.,  to  clean (includes  decontamination,  when  required),  to  preserve,  to  paint,  or  to  replenish  fuel,  lubricants,  chemical  fluids,  or gases. d.    Adjust.    To  maintain  or  regulate,  within  prescribed  limits,  by  bringing  into  proper  or  exact  position,  or  by setting the operating characteristics to specified parameters. e.  Aline.  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.  Remove/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 is shown as the 3rd position code of the SMR code. B-1

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