TM 5-3810-289-24P 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 PG ** Items coded PC are subject to deterioration. Items with these codes are not to be requested/requisitioned individually.  They KD are part of a kit which is authorized to the KF maintenance category indicated in the 3d KB position of the SMR code.  The complete kit must be requisitioned and applied. MO-(Made at UM/ Items with these codes are not AVUM Level) to be requested/requisitioned MF-(Made at DS/ individually.  They must be AVUM Level) made from bulk material which MH-(Made at GS is identified by the part number Level) in the DESCRIPTION AND ML-(Made at Spe- USABLE ON CODE (UOC) cialized Repair column and listed in the Bulk Activity (SRA)) Material group of the repair MD-(Made at parts list in this RPSTL.  If Depot) 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 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 UM/AVUM make up the assembled item Level) must be requisitioned or AF-(Assembled by fabricated and assembled at DS/AVIM the level of maintenance Level) indicted by the source code.  If AH-(Assembled by the 3d position code of the GS Category) SMR code authorizes you to AL-(Assembled by replace the item, but the source SRA) code indicates the item is AD-(Assembled by assembled at a higher level, Depot) order the item from the higher level of 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 FSCM or 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 FSCM or 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, replace, 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  lowest level  that  can  do  complete  repair  of  the  item. Change 1  2