Code C . . . . . . . . O . . . . . . . . ( 3) Explanation Crew or Operator maintenance. Organizational maintenance. Recoverability    code    indicates    whether unserviceable   items   should   be   returned   for   re- covery   or   salvage. Items  not  coded  are  expend- able.   Recoverability   codes   are: Code Explanation R Applied to repair parts, (assemblies and com- ponents)  special  tools  and  test  equipment which  are  considered  economically  repar- able  at  direct  and  general  support  main- tenance levels. When the item is no longer economically  reparable,  it  is  normally  dis- posed   of   at   the   GS   level.   When   supply considerations dictate, some of these repair parts  may  be  listed  for  automatic  return to supply for depot level repair as set forth in AR 710-50. When so listed, they will be replaced by supply on an exchange basis. S Repair Parts,  Special Tools, and Test Equip- ment and assemblies which are economical- ly reparable at DSU and GSU activities and which normally are furnished by supply on an  exchange  basis. When  items  are  de- termined  by  a  GSU  to  be  uneconomically reparable, they will be evacuated to a depot for evaluation and analysis before final dis- position. T High  dollar  value  recoverable  repair  parts, special tools and test equipment which are subject  to  special  handling  and  are  issued on an exchange basis. Such items will be evacuated to the depot for overhaul or final disposition.   Communication-Electronics   and Missile Support  items  will be repaired over- hauled only at depots. U Repair Parts,  Special Tools and Test Equip- ment   specifically   selected   for   salvage   by reclamation units because of their precious metal  content,  critical  materials,  high  dol- lar value or reusable casings or castings. b.  Federal   Stock   Number.   This   column   in- dicates   the   Federal   stock   number   assigned   to the   item   and   will   be   used   for   requisitioning   pur- poses. c.  Description. This   column   indicates   the Federal   item   name   and   a   minimum   characteristic description   required   to   describe   the   item.   As- sembly   components   and   subassemblies   are   in- dented   under   major   assemblies.   The   abbreviation “w/e”,   when   used   as   part   of   the   nomenclature, indicates   the   Federal   stock   number   includes   all armament,   equipment,   accessories,   and   repair parts   issued   with   the   item.   A   part   number   or other   reference   number   is   followed   by   the a p p l i c a b l e    f i v e - d i g i t    F e d e r a l    s u p p l y    c o de for   manufacturers   in   parenthesis.   Material   re- quired   for   manufacture   or   fabrication   is   identi- fied. C-2 d.  Unit   of   Measure   (U/M).   A    two-character alphabetic   abbreviation   indicating   the   amount or   quantity   of   the   item,   as   used,   upon   which   the allowances  are  based,  e.g.  ft.,  ea.,  pr.,  etc. e.  Quantity   Incorporated   in   Unit.   This  c o l - umn   indicates   the   quantity   of   the   item   used   in the   assembly   group. A   “V”   appearing   in   this column   in   lieu   of   a   quantity   indicates   that   a definite   quantity   cannot   be   indicated,   e.g.,   shims, spacers,   etc. f.  Illustration. This  column  is  divided  as  fol- lows: (1)  Figure   number. Indicates   the   figure number   of   the   illustration   in   which   the   item   is shown. (2)  Item    number. Indicates    the    callout n u m b e r    u s e d    t o    r e f e r e n c e    t h e    i t e m    o n    t h e    i l - lustration. C-4.      Special   Information a.  Identifications   of   the   useable   on   codes   in- cluded   in   the   description   column   of   this   publi- cation   are: (Not   applicable). b.  Parts   which   require   manufacture   or   as- sembly  at  a  level  higher  than  that  authorized  for installation   will   indicate   in   the   source   column the   higher   level. C-5.   How   to   Locate   Repair   Parts a.  When   Federal   Stock   Number,   Reference Number,   or   Part   Number   is   unknown: (1)  Using  the  table  of  contents,  determine the   assembly   group   within   which   the   repair   part belongs. This   is   necessary   since   illustrations are   prepared   for   assembly   groups   and   listings are  divided  into  the  same  groups. (2)   Find   the   illustration   covering   the   assem- bly  group  to  which  the  repair  part  belongs. (3)  Identify  the  repair  part  on  the  illustra- tion   and   note   the   illustration   figure   and   item number   of   the   repair   part. (4)   Using   the   Repair   Parts   Listing,   find the   assembly   to   which   the   repair   part   belongs and  locate  the  illustration  figure  and  item  num- ber   noted   on   the   illustration. b.  When   the   Federal   Stock   Number,   Refer- ence  Number,  or  Part  Number  is  known: Use the   Repair   Parts   Listing   to   find   the   assembly group   of   the   repair   part   and   the   illustration figure   number   and   item   number. c.  When   the   Federal   Stock   Number,   Refer- ence   Number,   or   Part   Number   is   Known   and the   Repair   Part   is   not   Illustrated:   Using   the applicable   group   number   and   page   number,   lo-