TM 55-4920-328-23P Section I.  INTRODUCTION 1.  Scope. This   manual   lists   repair   parts,   special   tools,   test, measurement,   and   diagnostic   equipment   (TMDE);   and other   support   equipment   required   for   operation   and performance    of    Aviation    Unit    Maintenance    (AVUM), Aviation   Intermediate   Maintenance   (AVIM),   and   depot maintenance   of   the   Test   Stand,   Aircraft   Engine   P/N LTCT10465-02. 2.  General. This Repair Parts and Special Tools list is divided into the following sections. a. Section  II.    Repair  Parts  List.    A  list  of  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.    This section    is    arranged    by    functional    group,    usually    in disassembly    order,    and    listed    in    figure    and    item sequence.  Items are indented when required to indicate the   relationship   to   the   next   higher   assembly.      The illustrations    in    this    section    will    appear    immediately preceding   each   figure   of   text.      Items   which   are   not assigned  SMR  codes  appear  for  informational  purposes only and are not to be requisitioned. b. Section III.   Special Tools List.  A list of special tools,  TMDE,  and  support  equipment  authorized  for  the performance of maintenance.  This section is arranged in figure  and  item  number  sequence.    The  illustrations  will appear immediately preceding each figure of text. c. Section  IV.  This section is divided as follows: (1) National   Stock   Number   and   Part   Number Index.      A  list,  in  ascending  National  Item  Identification Number  (NIIN)  sequence,  of  all  National  stock  numbers appearing in the listings, followed by a list, in alphameric sequence,  of  all  part  numbers  appearing  in  the  listings. National   stock   number   and   part   numbers   are   cross- referenced  to  each  illustration  figure  and  item  number appearance. (2) Supplemental   National   Stock   Number   and Part  Number Index.  A supplemental list of all added or changed   National   stock   numbers   and   part   numbers presented   in   the   same   format   as   the   National   Stock Number and Part Number Index.  Supplemental National stock numbers and part numbers are cross-referenced to each   illustration   figure   and   item   number   appearance. Refer to supplemental index before using basic index. 3.  Explanation of Columns. The   following   provides   an   explanation   of   columns found in the tabular listings: a. Illustration.  This column is divided as follows: (1) Figure Number.  Indicates the figure number of the illustration in which the item is shown. (2) Item   Number.    The  number  used  to  identify each item called out in the illustration. b. Source,   Maintenance,   and   Recoverability   Codes (SMR). (1) Source  Code.    Source  codes  are  assigned  to support items to 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 Definition PA Item  procured  and  stocked  for  anticipated  or known usage. PB Item   procured   and   stocked   for   insurance purpose  because  essentiality  dictates  that  a minimum  quantity  be  available  in  the  supply systems. PC Item     procured     and     stocked     and     which otherwise would be coded PA except that it is deteriorative in nature. PE Support  equipment  procured  and  stocked  for initial issue or outfitting to specified maintenance repair activities. MO Item   to   be   manufactured   or   fabricated   at Aviation Unit Maintenance (AVUM) level. MF Item   to   be   manufactured   or   fabricated   at Aviation   Intermediate   Maintenance   (AVIM) level. MD Item to be manufactured or fabricated at the depot maintenance level. AO Item    to    be    assembled    at    Aviation    Unit Maintenance (AVUM) level. AF Item to be assembled at Aviation Intermediate Maintenance (AVIM) level. AD Item  to  be  assembled  at  depot  maintenance level. XA Item  is  not  procured  or  stocked  because  the requirements  for  the  item  will  result  in  the replacement of the next higher assembly. XB Item   is   not   procured   or   stocked.      If   not available through salvage, requisition. XC Installation     drawing,     diagram,     instruction sheet field source drawing that is identified by manufacturer's part number. Change 4      1