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A-3. EXPLANATION OF COLUMNS IN THE MAC.
TM 9-6115-667-13&P Appendix A. MAINTENANCE ALLOCATION CHART (MAC) Section I.  INTRODUCTION A-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 subcolumns, 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 inspections and explanatory notes for a particular maintenance function. A-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  dean  (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. A-1

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