TM 5-6675-312-24P Section I.  INTRODUCTION 1.  Scope This   manual   lists   spares   and   repair   parts;   special tools;     special     test,     measurement,     and     diagnostic equipment (TMDE), and other special support equipment  required  for  performance  of  organizational, direct support, and general support maintenance of the Theodolite.  It authorizes the requisitioning and issue of spares and repair parts as indicated by the source and maintenance codes. 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  performance  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   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.    A  list  of  special tools,     special     TMDE,     and     other     special     support equipment authorized for the performance of maintenance. c.      Section  IV.    National  Stock  Number  and  Part Number  Index.    A    list  in  National  item  identification number (NIIN) sequence, of all National stock numbers (NSN)  appearing  in  the  listings,  followed  by  a  list  in alphameric  sequence  of  ad  part  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 item numbers. 3.  Explanation of Column a.  Illustration.  This column is divided as follows: (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  ova  haul  of  end  items.    Source  codes  are entered in the first and second positions of the Uniform SMR Code format as follows: Code Definition PA Item procured and stocked for anticipate or known Usage. PB Item procured and stocked for insurance purpose because    essentiality    dictates    that    a    minimum quantity be available in the supply system. PC Item  procured  and  stocked  and  which  otherwise would be coded PA except that it is deteriorative in nature. PD Support     item,     excluding     support     equipment, procured for initial issue or outfitting and stocked only  for  subsequent  or  additional  initial  issues  or outfittings. Not subject to automatic replenishment. PE Support    equipment    procured    and    stocked    for initial issue or outfitting to specified maintenance repair activities. 1