TM   5-3810-302-24P Code PA PB PC** PD PE PF PG KD KF KB 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  3d position of the SMR code. **     Items     coded     PC     are     subject     to deterioration. Hems   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. 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) 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) Hems 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. 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 make up 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. A   - 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 - Hem 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 en- tered 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 indi- cate  authorization  to  one  of  the  following  levels  of maintenance. Code Application/Explanation C- Crew or operator maintenance done within O- unit  maintenance  or  aviation  unit  mainte- nance. 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 re- pair  may  be  done  on  the  item  at  a  lower  level  of maintenance,  if  authorized  by  the  Maintenance  Alloca- tion 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