APPENDIX  E REPAIR   PARTS   AND   SPECIAL   TOOLS   LIST Section I. INTRODUCTION E-1. Scope. This   manual   lists   spares   and   repair   parts; special   tools;   special   test,   measurement,   and diagnostic  equipment  required  for  performance  of organizational,  direct  support,  and  general  sup- port  depot  maintenance  of  the  Target  Set.  It authorizes  the  requisitioning  and  issue  of  spares and  repair  parts  as  indicated  by  the  source  and maintenance codes. E-2.  General.   This  Repair  Parts  and  Special Tools List is divided into the following sections: a. Section II. Repair Parts List. A list of spares and  repair  parts  authorized  for  use  in  the  per- formance  of  maintenance.  The  list  also  includes parts  which  must  be  removed  for  replacement  of the  authorized  parts.  Parts  lists  are  composed  of functional  groups  in  ascending  numeric  sequence, with  the  parts  in  each  group  listed  in  figure  and item number sequence. Bulk materials are listed in NSN sequence. b.  Section  III.  Special  Tools  List.  (Not  Ap plicable). c. Section IV. National Stock Number and Part Number Index. A list, in National Item Identifica- tion  Number  (NIIN)  sequence,  of  all  National Stock  Numbers  (NSN)  appearing  in  the  listings, followed  by  a  list  in  alphanumeric  sequence  of  all parts  numbers  appearing  in  the  listings.  National stock  numbers  and  part  numbers  are  cross- -referenced  to  each  illustration  figure  and  item number  appearance.  This  index  is  followed  by  a cross-reference  list  of  reference  designators  to figure and items numbers. E-3. Explanation of Columns. a.  Illustration.  This  column  is  divided  as  fol- lows: (1)  Figure  Number.   Indicates   the   figure number  of  the  illustration  on  which  the  item  is shown. (2) Item Number. The number used to identify item called out in the illustration. b.  Source,  Maintenance  and  Recoverability (SMR) Codes. (1)  Source  Code.  Source  codes  indicate  the manner   of   acquiring   support   items   for maintenance,  repair  or  overhaul  of  end  items. Source  codes  are  entered  in  the  first  and  second positions  of  the  Uniform  SMR  code  format  as follows: Code PA PB PC PD PE PF PG Definition Item   procured and   stocked   for anticipated or known usage. Item   procured and   stocked   for insurance  purposes  because  essentiali- ty dictates that a minimum quantity be available in the supply system. Item  procured  and  stocked  and  which otherwise  would  be  coded  PA  except that it is deteriorative in nature. Support  item, excluding   support equipment, procured for initial issue or outfitting  and  stocked  only  for  subse- quent  or  additional  initial  issues  or outf  ittings.  Not  subject  to  automatic replenishment. Support   equipment   procured   and stocked for initial issue or outfitting to specified maintenance repair   ac- tivities. Support  equipment  which  will  not  be stocked but which will be centrally pro- cured on demand. Item  procured  and  stocked  to  provide for sustained support for the life of the equipment.  It  is  applied  to  an  item peculiar  to  the  equipment  which,  be- cause  of  probable  discontinuance  or shutdown   of   production   facilities, w o u l d    p r o ve u n e c o n o m i c a l    to reproduce at a later time. E-1