Quantcast APPENDIX C MAINTENANCE ALLOCATION CHART (MAC) SECTION I.  INTRODUCTION C-1.  THE ARMY MAINTENANCE SYSTEM MAC. a. This  introduction  (Section  I)  provides  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 consistent with the capacities and capabilities of the designated maintenance levels, which are shown on the MAC in column (4) as: (1) Unit - Includes two subcolumns, C (operator/crew) and O (unit) maintenance. (2) Direct Support - includes an F subcolumn. (3) General Support - includes an H subcolumn. (4) Depot - Includes a 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. C-2.  MAINTENANCE FUNCTIONS.    Maintenance functions will be limited to and defined as follows' (see 3.2 5.2g for ammunition MAC exception). a. Inspect  To  determine  the  serviceability  of  an  Item  by  comparing  its  physical,  mechanical,  and/or  electrical characteristics with established standards through examination (e.g., by sight, sound, or feel). b. Test.  To verify serviceability by measuring the mechanical, pneumatic, hydraulic, 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 decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or gases. d. Adjust.  To  maintain  or  regulate,  within  prescribed  limits,  by  bringing  into  proper  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 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"  s authorized by the MAC and assigned maintenance level is shown as the 3d position code of the SMR code. C-1

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