TM 10-3930-257-24P Code Application/Explanation PA Stocked Items; use the applicable NSN to PB request/requisition Items with these source PC** codes.  They are authorized to the category PD indicated by the code entered in the 3d PE position of the SMR code. PF **  Items coded PC are subject to PG deterioration. Items with these codes are not to be KD requested/requisitioned individually.  They KF 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 to AVUM Level) be requested/requisitioned MF-(Made at DS/ individually They must be made AVUM Level) from bulk material which  is MH-(Made at GS Identified by the part number in Level the DESCRIPTION AND USABLE ON CODE (UOC) column and ML-(Made at Spe- listed in the Bulk Material group cialized Repair of the repair parts list in this Activity (SRA)) RPSTL.  If the Item is authorized MD-(Made at to you by the 3d position code of Depot) the SMR code, but the source code indicates it Is made at a higher level, order the Item from the higher level of maintenance. Items with these codes are not to be requested/requisitioned AO-(Assembled by Individually.  The parts that make UM/ AVUM up the assembled Item must be Level) requisitioned or fabricated and AF-(Assembled by assembled at the level of DS/AVIM maintenance indicted by the Level) source code.  If the 3d position AH-(Assembled by code of the SMR code GS Category) authorizes you to replace the Item, but the source code AL-(Assembled by Indicates the Item Is assembled SRA) at a higher level, order the item AD-(Assembled by from the higher level of Depot) maintenance. XA - Do not requisition an "XA"-coded Item.  Order its next higher assembly.  (Also refer to the NOTE following.) 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 identified by the manufacturer’s part number. XD - Item is not stocked.  Order an "XD"-coded item through normal supply channels using the CAGE and part number given, if no NSN is available. NOTE:   Cannibalization   or   controlled   exchange,   when authorized, may be used as a 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 maintenance or aviation unit mainte- nance. 0 - 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, re- place, and use the item. D - Depot level can remove, replace, and use the item. (b) The   maintenance   code   entered   in the  fourth  position  tells  whether  or  not  the  item  is  to  be repaired and Identifies the lowest maintenance level with the   capability   to   do   complete   repair   (i.e.,   perform   all authorized repair functions).  (NOTE: Some limited repair may be done on the item at a lower level of maintenance, if authorized by the Maintenance Allocation Chart (MAC) and  SMR  codes.)  This  position  will  contain  one  of  the following maintenance codes: Code Application/Explanation O - Unit maintenance or aviation unit is the low- est level that can do complete repair of the item. F - Direct support or aviation intermediate Is the lowest level than can do complete repair of the item. 2

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