TM 5-3895-360-24P 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 AVUM Level) to be requested/requisitioned MF-(Made at DSI 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 USABLE ON CODE (UOC) ML-(Made at Spe- column and listed in the Bulk cialized Repair Material group of the repair Activity (SRA)) parts list in this RPSTL.  If the MD-(Made at item is authorized to you by the Depot) 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 items with these codes are not to be requested/requisitioned AO-(Assembled by individually.  The parts that UM/ AVUM make 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 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 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 F - Direct support or aviation intermediate is the lowest level than can do complete repair of the item. 2