TM 5-2410-234-20P UNIT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST SECTION I.  INTRODUCTION 1. Scope. This   RPSTL   lists   and   authorizes   spares   and   repair   parts; special    tools;    special    test,    measurement,    and    diagnostic equipment    (TMDE);    and    other    special    support    equipment required for performance of Unit Maintenance of the Tractor.  It authorizes the requisitioning, issue, and disposition of spares, repair   parts   and   special   tools   as   indicated   by   the   source, maintenance and recoverability (SMR) codes. 2. General. In  addition  to  Section  I.    Introduction,  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    by    this    RPSTL    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 ascending   alphanumeric   sequence,   with   the   parts   in   each group  listed  in  ascending  figure  and  item  number  sequence. Bulk materials are listed in item name  sequence.    Repair  kits are   listed   separately   in   their   own   functional   group   within Section  II.    Repair  parts  for  repairable  special  tools  are  also listed in the section.  Items listed are shown on the associated illustration(s)/figure(s). b. Section  III    Special  Tools  List.    A  list  of  special tools,   special   TMDE,   and   other   special   support   equipment authorized by this RPSTL (as indicated by Basis of Issue (BOI) information    in    DESCRIPTION    AND    USABLE    ON    CODE column) for the performance of maintenance. c. Cross-reference   Indexes.      A   list,   in   National   Item Identification  Number  (NIIN)  sequence,  of  all  National  stock numbered  items  appearing  in  the  listing,  followed  by  a  list  in alphanumeric  sequence  of  all  part  numbers  appearing;  in  the listings.  National stock numbers and part numbers are cross- referenced    to    each    illustration    figure    and    item    number appearance.  The figure and item number index lists figure and item numbers in alphanumeric sequence and cross-references NSN, FSCM, and part numbers. 3. Explanation of Columns (Sections II and III). a. ITEM NO.  (Column (1)).  Indicates the number used to identify items called out in the illustration. b. SMR CODE (Column (2)).  The Source, Maintenance, and Recoverability (SMR) code is a 5-position code containing supply/requisitioning information, maintenance category  authorization criteria, and disposition instructions, as shown in the following breakout: Source Code 1st two positions XXxxx How you get an item Maintenance Code xxXXx 3d position 4th position Who can install, Who can replace or use do complete the item repair* on the item Recoverability Code xxxxX 5th position Who determines disposition action on an unserviceable item *Complete    Repair:    Maintenance    capacity,    capability,    and authority  to  perform  all  corrective  maintenance  tasks  of  the "Repair" function in a use/user environment in order to restore serviceability to a failed item. 1