TM 5-6115-590-20P 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  organizational  maintenance  of  the  Utility Power Plant (MUST). 2. General. 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.    Parts lists   are   composed   of   functional   groups   in   ascending numerical sequence, with the parts in each group listed in figure  and  item  number  sequence.    Bulk  materials  are listed in NSN sequence, as the last group in Section II. b.  Section III Special Tools List.  A list of special tools,  TMDE,  and  support  equipment  authorized  for  the performance of maintenance, at the organizational level. c.    Section  IV  National  Stock  Number  and  Part Number Index.  A list, in ascending numerical sequence, of  all  National  Stock  Numbers  appearing  in  the  listings, followed  by  a  list,  in  alphanumeric  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. 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. 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. PF Support equipment which will not be stocked but which will be centrally procured on demand. PG 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, because of probable discontinuance or shutdown of production facilities, would prove uneconomical to reproduce at a later time. KD An item of a depot overhaul/repair kit and not purchased separately.  Depot kit defined as a kit that provides items required at the time of overhaul or repair. KF An item of a maintenance kit and not purchased separately.  Maintenance kit defined as a kit that provides an item that can be replaced at organizational or intermediate levels of maintenance. KB Item included in both a depot overhaul/ repair kit and a maintenance kit. MO Item to be manufactured or fabricated at organizational level. MF Item to be manufactured or fabricated at the direct support maintenance level. MH Item to be manufactured or fabricated at the general support maintenance level. MD Item to be manufactured or fabricated at the depot maintenance level. AO Item to be assembled at organizational level. AF Item to be assembled at direct support maintenance level. AH Item to be assembled at general support maintenance level. 1