TM 5-3825-221-24P Code Application/Explanation Stocked  items;  use  the  applicable  NSN  to  request(requisition  items  with  these  source codes.    They  are  authorized  to  the  category  indicated  by  the  code  entered  in  the  3rd position of the SMR code. **  Items coded PC are subject to deterioration. Items with these codes are not to be requested/requisitioned individually.  They re part of a kit which is authorized to the maintenance category indicated in the 3rd 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  of  the  repair  parts  list  in  this RPSTL.  H the item is authorized to you by the 3rd 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   puts   that   make   up   the   assembled   item   must   be requisitioned  or  fabricated  and  assembled  at  the  level  of  maintenance indicated by the source code.  H the 3rd position code of the SMR code authorizes  you  to  replace  the  item,    but  the  source  code  indicates  the items  are  assembled  at  a  higher  level,    order  the  item  from  the  higher level of maintenance. XA- Do not requisition "XA"-coded item.  Order its next higher assembly.  (Refer to the NOTE below.) XB- If an UXB" item is not available from salvage,  order it using the CAGEC and part number given. XC- Installation  drawing,    diagram,    instruction  sheet,    field  service  drawing,    that  is  identified  manufacturer's  part number. XD-     Item  is  not  stocked.    Order  an    XD"-coded  item  through  normal  supply  channels  using  the  CAGEC  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. F- Direct support or aviation intermediate is the lowest level than can do complete repair of the item. 2 PA PB PC** PD PE PF PG KD KF KB MO- (Made at Unit/AVUM Level) MF- (Made at DS/AVUM Level) MH- (Made at GS Level) ML- (Made at Specialized Repair Activity (SRA)) MD- (Made at Depot) AO- (Assembled by Unit/AVUM Level) AF- (Assembled by DS/AVIM Level) AH- (Assembled by GS Category) AL- (Assembled by SRA) AD- (Assembled by Depot)