TM 5-3895-330-24P Code Application/Explanation Stocked Items; use the applicable NSN to request/requisition items with these source codes.    They are author ized to the category indicated by the code entered in the ad position of the SMR code. ** Items coded PC are subject to deterioration. Items  with  these  codes  are  not  to  be  requested/requisitioned  individually.        They  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. Items with these codes are not to be requested/requisitioned individually.    They must be made 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  c/a/`zed  Repair  of  the  repair  parts  list  in  this RPSTL.    If 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  individually.        The  parts  that makeup the assembled item must be requisitioned or fabricated and assembled at the level of maintenance indicted by the source code.    If the 3d position code of the SMR code authorizes you to replace the item,  but the source code indicates the item is assembled at a higher level, 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 MO-(Made at UM/ AVUM Level) MF-(Made at DS/ AVUM Level) MH-Made at GS Level) ML-(Made at Spe cialized Repair Activity (SRA) MD-(Made at Depot) KD KF KB PA PB PC** PD PE PF PG AO-(Assembled/ by UM/ AVUM Level) AF-(Assembled by DS/AVIM Level) AH ( Assembled by GS Category) AL-(Assembled by SRA) AD-(Assembled by Depot)