SECTION I TM 53810-232-20P 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 Crane,  Wheel Mounted. 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  111.  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 111) 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