APPENDIX   B MAINTENANCE   ALLOCATION   CHART Section   I.   INTRODUCTION B-1.  General a. This  section  provides  a  general  explanation  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   im- plementation  of  the  maintenance  functions  upon the  end  item  or  component  will  be  consistent  with the   assigned   maintenance   functions. c.  Section  III  is  not  applicable. d. Section  IV  contains  supplemental  instructions or   explanatory   notes   required   for   a   particular maintenance  function. B-2.   Explanation   of   Columns   in   Section   II a.  Group  Number,  Column  (1).  The   assembly group  number  is  a  numerical  group  assigned  to each  assembly.  The  assembly  groups  are  listed  on the  MAC  in  disassembly  sequence  beginning  with the   first   assembly   removed   in   a   top   down disassembly    sequence. b.  Assembly  Group,  Column  (2).  This   column contains   a   brief   description   of   the   components   of each   assembly   group. c.  Maintenance  Functions,  Column  (3).   T h is column  lists  the  various  maintenance  functions  (A through  K).  The  upper  case  letter  placed  in  the appropriate  column  indicates  the  lowest  main- tenance  level  authorized  to  perform  these  functions. The   symbol   designations   for   the   various   main- tenance   levels   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  com- paring  its  physical,  mechanical,  and  electrical  charac- teristics  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, and to add fuel, lubricants, cooling agents, and air. D-Adjust.  To  rectify  to  the  extent  necessary  to  bring  into proper operating range. E-Align. 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 measurements.  Consists  of  the  comparison  of  two  in- struments, one of which is a certified standard of known accuracy,  to  detect  and  adjust  any  discrepancy  in  the accuracy  of  the  instrument  being  compared  with  the certified  standard. G-Install.  To  set  up  for  use  in  an  operational  environment such as an emplacement, site, or vehicle. H-Replace.  To  replace  unserviceable  items  with  serviceable like item. I-Repair. Those maintenance operations necessary to restore an  item  to  serviceable  condition  through  correction  of material  damage  or  a  specific  failure.  Repair  may  be accomplished at each level of maintenance. J-Overhaul.  Normally,  the  highest  degree  of  maintenance performed by the Army in order to minimize time work is in  process  consistent  with  quality  and  economy  of operation.  It  consists  of  that  maintenance  necessary  to restore  an  item  to  completely  serviceable  condition  as prescribed   by   maintenance   standards   in   technical publications  for  each  item  of  equipment.  Overhaul  nor- mally does not return an item to like new, zero mileage, or zero hour condition. K-Rebuild.  The  highest  degree  of  materiel  maintenance.  It consists of restoring equipment as nearly as possible to new condition   in   accordance   with   original   manufacturing standards.  Rebuild  is  performed  only  when  required  by operational considerations or other paramount factors and then only at the depot maintenance level. Rebuild reduces to zero the hours or miles the equipment, or component thereof, has been in use. d.  Work  Measurement  Time.  The  active  repair time  required  to  perform  the  maintenance  function is   included   directly   below   the   symbol   identifying the   level   of   maintenance.   This   time   includes preparation   time,   fault   isolation   /   diagnostic   time, and  QA  /  QC  time  in  addition  to  the  time  required to   perform   specific   maintenance   functions   iden- tified  for  the  tasks  authorized.  This  time  is  ex- pressed   in   man-hours   and   carried   to   one   decimal place  (tenths  of  hours). e.   Tools   and   Equipment,   Column   (4).   T h is column   is   provided   for   referencing   by   code   the special  tools  and  test  equipment  (sec.  III).  required to  perform  the  maintenance  functions  (sec.  II). f.   Remarks, Column   (5).  This   column   is provided  for  referencing  by  code  the  remarks  (sec. IV)   pertinent   to   the   maintenance   functions. B-3.   Explanation   of   Columns   in   Section   IV. a.  Reference  Code.   This   column   consists   of   two letters  separated  by  a  dash  (entered  from  col.  5  of B-1