TM 10-3930-409-24P used in the breakout shown on the illustration figure,  which is  prepared for a functional group,  subfunctional  group, or an assembly.  A  "V" appearing in this column in lieu of a quantity   indicates   that   the   quantity   is   variable   and   the quantity may vary from application to application. 4. Explanation of Columns (Section IV). a. NATIONAL STOCK NUMBER (NSN) INDEX. (1)   STOCK  NUMBER  column.    This  column  lists the   NSN   by   National   Item   Identification   Number   (NIIN) sequence.  The NIIN consists of the last nine NSN digits of the NSN (i.e., 5305-01-874-1467 ).  When NIIN using this column to locate an item, ignore the first 4 digits of the NSN.  However, the complete NSN should be used when ordering items by stock number. (2) FIG. column.   This  column  lists  the  number  of the figure where the item is identified/located.  The figures are in numerical order in Section II and Section III. (3)  ITEM  column.   The  item  number  identifies  the item  associated  with  the  figure  listed  in  the  adjacent  FIG. column.    This  item  is  also  identified  by  the  NSN  listed  on the same line. b.  PART NUMBER INDEX.  Part numbers in this index are   listed   by   part   number   in   ascending   alphanumeric sequence  (i.e.,  vertical  arrangement  of  letter  and  number combination  which  places  the  first  letter  or  digit  of  each group  in  order  A  through  Z,  followed  by  the  numbers  0 through 9 and each following letter or digit in like order). (1) CAGEC column.  The Federal Supply Code for Manufacturer  (CAGEC)  is  a  5-digit  numeric  code  used  to identify    the    manufacturer,    distributor,    or    Government agency, etc., that supplies the item. (2) PART NUMBER column.  Indicates the primary number    used    by    the    manufacturer    (individual,    firm, corporation,   or   Government   activity),   which   controls   the design  and  characteristics    of  the  item  by  means  of  its engineering drawings, specifications standards, and inspection   requirements   to   identify   an   item   or   range   of items. (3)  STOCK  NUMBER  column.    This  column  lists the NSN for the associated part number and manufacturer identified  in  the  PART  NUMBER  and  CAGEC  columns  to the left. (4)   FIG. column.   This column lists the number of the figure where the item is identified/located in Section II and III. (5)   ITEM    column.        The    item    number    is    that number  assigned  to  the  item  as  it  appears  in  the  figure referenced in the adjacent figure number column. c. FIGURE AND ITEM NUMBER INDEX. (1)   FIG. column.   This column lists the number of the figure where the item is identified/located in Sections II and Ill. (2)   ITEM    column.        The    item    number    is    that number  assigned  to  the  item  as  it  appears  in  the  figure referenced in the adjacent figure number column. (3)   STOCK  NUMBER  column.    This  column  lists the NSN for the item. (4)   CAGEC column.  The Federal Supply Code for Manufacturer  (CAGEC)  is  a  5-digit  numeric  code  used  to identify    the    manufacturer,    distributor,    or    Government agency, etc., that supplies the item. (5)   PART NUMBER column.  Indicates the primary number    used    by    the    manufacturer    (individual,    firm, corporation,   or   Government   activity),   which   controls   the design   and   characteristics   of   the   item   by   means   of   its engineering     drawings,     specifications     standards          and inspection    requirements  to  identify  an  item  or  range  of items. 5. Special Information. a. USABLE ON CODE.  The usable on code appears in the lower left corner of the Description column heading. Usable   on   codes   are   shown   as   "UOC:      ....."   in   the Description  column  justified  left)  on  the  first  line  following applicable  item  description/nomenclature.    Uncoded  items are applicable to all models.  Identification of the usable on codes used in the RPSTL are: Code Used On CQL MHE 189 CQM MHE 189A CQN MHE 189B b. FABRICATION  INSTRUCTIONS.     Bulk   materials required   to   manufacture   items   are   listed   in   the   Bulk Material  Functional  Group  of  this  RPSTL.    Part  numbers for  bulk  materials  are  also  referenced  in  the  Description column    of    the    line    item    entry    for    the    item    to    be manufactured/fabricated.    Detailed  fabrication  instructions for items source coded to be manufactured   or  fabricated are  found  in TM 10-3930-409-20 and TM 10-3930-409-35 4