TM 1-4920458-13&P Code Explanation KD Items with these codes are not to be requested/ KF requisitioned individually.   They are part of a KB kit which is authorized to the maintenance catego- ry indicated in the 3rd position of the SMR code. The complete kit must be requisitioned and ap- plied. KO (made at Org/AVUM level) Items with these codes are not to be requested/ MF (made at DS/AVIM level) requisitioned individually.   They must be made MH (made at GS level) from bulk material which is identified by part ML (made at Specialized number  in  the  DESCRIPTION  AND  USABLE  ON  CODE (UOC) Repair Activity (SRA) column and listed in the Bulk Material group of MD (made at Depot) the repair parts list in this RPSTL.   If the item is authorized to you by the 3rd position 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. AO (assembled at Org/AVUM lev- Items with those codes are not to be requested/ el) requisitioned individually.   The parts that make AF (assembled at DS/AVIM level) up the assembled item must be requisitioned or AH (assembled at GS level) fabricated at the level of maintenance indicated AL (assembled by SRA) by the source code.   If the 3rd position autho- AD (assembled at Depot) rizes 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 mainte- nance. XA Do not requisition an "XA"-coded item.   Order its next higher assembly.  (Also,  refer to the NOTE below. XB If an "XB" item is not available for salvage,  or- der it using the CAGE and part number given. XC Installation drawing,  diagram,  instruction sheet, field service drawing,  that is identified by manufacturer's part number. 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. C-3