APPENDIX C MAINTENANCE ALLOCATION CHART Section I.  INTRODUCTION C-1.  General a. This section provides a general explana- tion of all maintenance and repair functions authorized  at  various  maintenance  levels. b.  Section  II  designates  overall  responsibility for  the  performance  of  maintenance  functions on  the  identified  end  item  or  component.  The implementation  of  the  maintenance  functions upon the end item or component will be con- sistent with the assigned maintenance func- tions. c. Section III  lists the special tools and test equipment  required  for  each  maintenance  func- tion as referenced from Section II. d. Section IV contains supplemental instruc- tions, explanatory notes and/or illustrations required  for  a  particular  maintenance  function. C-2. Explanation of Columns in Section II a.  Group  Number,  Column  (1).  The  func- tional group is a numerical group set up on a functional  basis.  The  applicable  functional grouping  indexes  (obtained  from  TB  750-93-1, Functional  Grouping  Codes)  are  listed  on  the MAC (Maintenance Allocation Chart) in the appropriate  numerical  sequence.  These  indexes are normally set up in accordance with their function and proximity to each other. b.  Functional  Group,  Column  (2).  This   col- umn contains a brief description of the com- ponents of each functional group. c. Maintenance  Functions,  Column  (3).   This column  lists  the  various  maintenance  functions (A  through  K)  and  indicates  the  lowest  main- tenance  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 H—General  support  maintenance D—Depot maintenance The  maintenance  functions  are  defined  as  fol- lows: A—Inspect: To determine serviceability of an item by comparing its physical, mechanical, and elec- trical  characteristics  with  established  standards. B—Test: To verify serviceability and to detect elec- trical  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 ac- curacy  of  the  instrument  being  compared  with the certified standard. G—Install: To set up for use in an operational en- vironment  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  con- dition. This includes, but is not limited to,  in- spection,   cleaning,   preserving,   adjusting,   re- placing,  welding,  riveting,  and  strengthening. J—Overhaul:  To  restore  an  item  to  a  completely serviceable condition as prescribed by mainten- ance serviceability standards using the Inspect and  Repair  Only  as  Necessary  (IROAN)  tech- nique. 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 disassem- C-1