TM 10-3510-220-24P *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) 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 follows: XA - Do not requisition “XA” - coded item.  Order its next higher assembly.  (Also, refer to the NOTE below.) XB - If an “XB” item is not available from salvage, order it using the CAGEC and part number given. XC - Installation drawing, diagram, instruction sheet, field service drawing, that is identified by Reciprocating Compressor manufacturer’s part number. XD - Item is not stocked.  Order an “XD” - coded item through normal supply channels using the CAGEC and part number if no NSN is available. 2 PA PB PC PD PE PF PG KD KF KB MO--Made at org/AVUM category MF--Made at DS/AVUM category MH--Made at GS category ML--Made at Specialized Repair   Activity (SRA) MD--Made at Depot AO--Assembled by org/AVUM category AF--Assembled by DS/AVIM category AH--Assembled by GS category AL--Assembled by SRA AD--Assembled by Depot 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 third position of the SMR code. **NOTE Items coded PC are subject to deterioration. 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 third 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   material   which   is identified by the part number in the description and usable on code (UOC)  column  and  listed  in  the  Bulk  Material  group  of  the  repair parts list.  If the Item is authorized to you by the third position code of  the  SMR  code,  but  the  source  code  indicates  it  is  made  at  a higher   category,   order   the   item   from   the   higher   category   of maintenance. Items    with    these    codes    are    not    to    be    requested/requisitioned individually.  The parts that make up the assembled item must be requisitioned   or   fabricated   and   assembled   at   the   category   of maintenance indicated by the source code.  If the third position of the SMR code authorizes you to replace the item, but the source code indicates the item is assembled at a higher category, order the item from the higher category of maintenance.