B-1 TM   5-4930-227-14 APPENDIX   B MAINTENANCE   ALLOCATION   CHART Section   I.   INTRODUCTION B-1.   General a. This  section  provides  a  general  explanation of all maintenance and repair functions author- ized  at  various  maintenance  levels. b. Section II designates overall responsibility for  the  performance  of  maintenance  functions  on the  identified  end  item  or  component.  The  imple- mentation of the maintenance functions upon the end  item  or  component  will  be  consistent  with  the assigned  maintenance  functions. c. Section  III  lists  the  special  tools  and  test equipment required for each maintenance func- tion  as  referenced  from  section  II.  (Not  appli- cable.) d. Section  IV  contains  supplemental  instruc- tions, explanatory notes and/or illustrations re- quired  for  a  particular  maintenance  function. B-2.  Explanation  of  Columns  in  Section  II a. Group Number, Column (1).  The  function- al group is a numerical group set up on a func- tional basis. The applicable functional grouping indexes (obtained from TB 750-93-1, Function- al   Grouping   Codes)   are   listed   on   the   MAC (Maintenance  Allocation  Chart)  in  the  appropri- ate numerical sequence. These indexes are nor- mally  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 compo- nent 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 vari- ous  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  follows: A-Inspect.  To  determine  serviceability  of  an  item  by comparing  its  physical,  mechanical,  and  electrical characteristics  with  established  standards. B-Test. To verify serviceability and to detect electrical 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  brint 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 reading of instruments or test equipment used in precise measurement. Consists of the comparisons of two instruments, one of which is a certified stand- ard of known accuracy, to detect and adjust any dis- crepancy  in  the  accuracy  of  the  instrument  being compared with the certified standard. G-Install. To set up for use in an operational environ- ment such as an emplacement, site, or vehicle. H-Replace. To replace unserviceable items with service- able  assemblies,  subassemblies,  or  parts. I-Repair.  To  restore  an  item  to  serviceable  condition. This includes, but is not limited to, inspection, clean- ing, preserving, adjusting, replacing, welding, rivet- ing, and strengthening. J-Overhaul. To restore an item to a completely service- able condition as prescribed by maintenance servicea- bility standards using the Inspect and Repair Only as Necessary (IROAN) technique. K-Rebuild. To restore an item to a standard as nearly as possible to original or new condition in appear- ance, performance, and life expectancy. This is ac- complished  through  complete  disassembly  of  the item, inspection of all parts or components, repair or replacement   of   worn   or   unserviceable   elements (items)  using  original  manufacturing  tolerances  and specifications,  and  subsequent  reassembly  of  the item. d.  Tools  and  Equipment,  Column  (4).  This  col- umn  is  provided  for  referencing  by  code  the special  tools  and  test  equipment  (sec.  III  )  re- quired  to  perform  the  maintenance  functions (sec. II). e.  Remarks,  Column  (5). This column is vialed for referencing by code the remarks IV)  pertinent  to  the  maintenance  functions. pro- (sec.