TM 10-3930-611-24P 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 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   a   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 UMI AVUM up the assembled Item must be Level) requisitioned or fabricated and AF-(Assembled by assembled at the level of DS/AVIM maintenance Indicated 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