TM  10-3930-657-24P 3 . Explanation of Columns (Sections II and Ill) (Con’t). (1) Source Code. The source code tells you how to get an item needed for maintenance, repair, or overhaul  of  an  end  item/equipment.  Explanations  of  source  codes  follow: Code ApplicationlExplanation PA PB PC** PD PE PF PG Stocked items; use the applicable NSN to request/requisition items with  these  source  codes.  They  are  authorized  to  the  category indicated by the code entered in the 3d position of the SMR code. **Items coded PC are subject to deterioration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . KD KF KB MO - Made at UM/AVUM Level MF - Made at DS/AVUM Level MH - Made at GS Level ML - Made  at Special- ized Repair Activity (WA) MD - Made at Depot items   with   these   codes   are   not   to   be   requested/requisitioned individually.   They   are   part   of   a   kit   which   is   authorized   to   the maintenance category indicated in the 3d position of the SMR code. The complete kit must be requisitioned and applied. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . items   with   these   codes   are   not   to   be   requested/requisitioned individually. They must be made from bulk materiel which is identified by the part number in the DESCRIPTION AND USABLE ON CODE (UOC)  column and listed in the bulk materiel group of the repair parts list in this RPSTL. If the item is authorized to you by the 3d position code of the SMR code, but the source code indicates it is made at a higher Ievel, order the item from the higher level of maintenance. AO  -  Assembled  by  UMI AVUM Level AF -    Assembled  by  DSI AVUM Level AH  -  Assembled  by  GS Level AL  -  Assembled  by  SRA AD  -  Assembled  at  De- pot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Items   with   these   codes   are   not   to   be   requestedhequisitioned individually.  The  parts  that  make  up  the  assembled  item  must  be requisitioned or fabricated and assembled at the level of maintenance indicted by the source code. If the 3d position code of the SMR code authorizes you to replace the item, but the source code indicates that the item is assembled at a higher Ievel, order the item from the higher level of maintenance. NOTE Cannibalization or controlled exchange, when authorized, maybe used as a source of supply  for  items  with  the  above  source  codes,  except  for  those  source  coded  “XA.” XA - DO NOT requisition an “XA’’-coded item. Order its next higher assembly. XB - If an “XB” item is not available from salvage, order it using the CAGE and part number given. Change 1 2

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