TM 10-3930-622-24P 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 KB position of the SMR code.  The complete kit must be requisitioned and applied. MO-(Made at UMI Items with these codes are not to AVUM Level) be requested/requisitioned MF-(Made at DSI Individually.  They must be made AVUM Level) from  bulk  material which  Is MH-(Made at GS Identified by the part number In 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 UMI 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 GS Category code of  the  SMR code 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.  Or- der 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 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, 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  re-paired 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  mainten-ance,  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