SECTION I TM 10-3930-615-24P (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: Code Application/Explanation PA Stocked items; use the applicable NSN to PB request/requisition items with these PC** source codes.  They are authorized to the PD category indicated by the code entered in PE 3d position of the SMR code. PF PG **Items coded PC are subject to deterioration. KD Items with these codes are not to be KF requested/requisitioned individually.  They KB 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. MO-(Made at UM Items with these codes are not A VUM Level) to be requested/ requisitioned MF-(Made at DS/ individually.  They must be made A VUM Level) 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 ML-(Made at of the repair parts list in this Specialized Repair RPSTL.  If the item is authorized Act (SRA)) to you by the 3d position code of the SMR code, but if the MD-(Made at source code indicates it is made Depot) at a higher level, order the item from the higher level of maintenance. AO-(Assembled by Items with these codes are not UM/A VUM Level) to be requested/requisitioned individually The parts that AF-(Assembled by make up the assembled item DS/A VIM Level) must be requisitioned or fabrica ted and assembled at the level AH-(Assembled by of maintenance indicated by GS Category) the source code.  If the 3d posi- tion code of the SMR code by AL-(Assembled by authorizes you to replace the SRA) item, but the source code indi- AD-(Assembled cates the item is assembled at a by Depot) bled at a higher level, order the item from the higher level of maintenance. XA - Do not requisition an "XA"-coded Item. Or- der its next higher assembly.  (Also, refer to the NOTE below.) XB - If an "XB" item is not available from salvage order it using the CAGE and part number given XC - Installation drawing, diagram, instruction sheet, field service drawing, that is identi- fied by the manufacturer's part number. XD - Item is not stocked.  Order an "XD"- coded item through normal supply channel using the CAGE and part number given, if no NSN is available. NOTE:      Cannibalization   or   controlled   exchange, when authorized, may be used as source of supply for  items  with  the  above  source  codes,  except  for those  source  coded  "XA"  or  those  aircraft  support items restricted by requirements of AR 700-42. (2) Maintenance  Code.    Maintenance  codes tell  you  the  level(s)  of  maintenance  authorized  to  USE and  REPAIR  support  items.    The  maintenance  codes are entered in the third and fourth positions of the SMR Code as follows: (a) The maintenance code entered in the third   position   tells   you   the   lowest   maintenance   level authorized  to  remove,  replace  and  use  an  item.    The maintenance   code   entered   in   the   third   position   will indicate  authorization  to  one  of  the  following  levels  of maintenance: Code Application/Explanation C - Crew  or  operator  maintenance  done  within  unit or aviation unit maintenance. O - Unit  maintenance  or  aviation  unit  category  can remove, replace and use the item. F - Direct support or aviation intermediate level can remove, replace and use the item. H - General support level can remove, replace and use the item. L - Specialized  repair  activity  can  remove,  replace and use the item. 2

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