APPENDIX  III MAINTENANCE    ALLOCATION Section I. INTRODUCTION 1. General a. Section  I  provides  a  general  explanation of all maintenance and repair functions au- thorized  at  various  maintenance  levels. b. Section  II  designates  overall  responsibil- ity for the performance of maintenance oper- ations  on  the  identified  end  item  or  component. The  implementation  of  the  maintenance  tests upon the end item or component will be con- sistent  with  the  assigned  maintenance  opera- tions. c. Section  III  lists  the  special  tools  and  test equipment  required  for  each  maintenance  oper- ation as referenced f rom Section II. d. Section  IV  contains  supplemental  instruc- tions,  explanatory  notes  and/or  illustrations  re- quired  for  a  particular  maintenance  function. 2. Explanation of Columns in Section II a.  Functional  Group  Number.  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 ) are listed on the MAC in the appropriate numerical  sequence.  These  indexes  are  normal- ly  set  up  in  accordance  with  their  function and proximity to each other. b.  Component  Assembly  Nomenclature.  This column containns a brief description of the com- ponents  of  each  functional  group. c. Essentiality. The essentiality column re- flects whether or not an assembly, or repair part, is combat essential to the tactical use of the end item. The letter “E” in this column indicates an item is combat essential. d. Maintenance  Operations  and  Maintenance Level.s. This column list-s the various mainte- nance  operations  (A  through  J)  and  indicates 26 the  lowest  maintenance  level  authorized  to  per- form  these  operations.  The  symbol  designations for  the  various  maintenance  levels  are  as  fcd- lows: O/C   -Operator   or   crew O -organizational DS -Direct   Support GS -General   Support D -Depot The  maintenance  operations  are  defined  as  fol- lows: A-Service.  Operations  required  periodically to  keep  the  item  in  proper  operating  condi- tion, i. e., to clean, preserve, drain, paint, and  replenish  fuel,  lubricants,  hydraulic,  and deicing  fluids,  or  compressed  air  supplies. B-Adjust. Regulate  periodically  to  prevent malfunction.   Adjustments   will   be   made commensurate  with  adjustment  procedures and  associated  equipment  specifications. C-Aline.  Adjust  two  or  more  components  of an electrical or mechanical system so that their functions are properly synchronized or adjusted. D-Calibmte. Determine, check, or rectify the graduation  of  an  instrument,  weapon,  or weapons  system  or  components  of  a  weapons system. E-Inspect.  Verify  serviceability  and  detect incipient  electrical  or  mechanical  failure  by close visual examination. F-Test.  Verify  serviceability  and  detect  incip- ient   electrical   or   mechanical   failure   by measuring  the  mechanical  or  electrical  char- acteristics  of  the  item  and  comparing  those characteristics with authorized standards. Tests will be made commensurate with test procedures  and  with  calibrated  tools  and/or test  equipment  referenced  in  the  MAC. AGO 10117A