TM 10-3930-620-24P 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 position of the SMR code The complete kit must be requisitioned and applied MO-(Made at UMI Items  with  these  codes  are  not to AVUM Level) be  requested/requisitioned MF-(Made at DS/ individually  They  must  be  made AVUM Level) from bulk material  which  Is MH(Made at GS identified by the part number In the DESCRIPTION AND USABLE Level) ON CODE (UOC) column and ML-(Made at Spe- listed  in  the  Bulk  Material  group cialized Repair    of   the   repair   parts   list   In   this Activity (SRA)) RPSTL   If   the   item   is   authorized   MD- (Made at to you by the 3d position code of Depot) the SMR code, but the source code indicates It is made at 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  make UM/AVUM up the assembled Item  must be Level) requisitioned   or   fabricated   and AF-(Assembled by         assembled at the level of DSIAVIM 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, 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