(1) Source Code. The source code tells you how to get an item needed for maintenance, repair, or
overhaul of an end item/equipment. Explanations of source codes follows:
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.
**NOTE: Items coded PC are subject to deterioration.
Items 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
3rd position of the SMR code. The complete kit must be requisitioned and applied.
MO - (Made at Unit/AVUM
Items with these codes are not to be requested/requisitioned
individually. They must be made from bulk material which
MF - (Made at DS/AVUM
is identified by the part number in the DESCRIPTION and
USABLE ON CODE (UOC) column and listed in the Bulk
MH - (Made at GS Level)
Material group of the repair parts list in this RPSTL. If the
ML - (Made at Specialized
item is authorized to you by the 3rd position code of the SMR
Repair Activity (SRA))
code, but the source code indicates it is made at a higher
MD - (Made at Depot)
level, order the item from the higher level of maintenance.
AO - (Assembled by Unit/AVUM
Items with these codes are not to be requested/
requisitioned individually. The parts that make up
AF - (Assembled by DS/AVIM
the assembled item must be requisitioned or
fabricated and assembled at the level of
AH - (Assembled by GS
maintenance indicated by the source code. If the
3rd position code of the SMR code authorizes you
AL - (Assembled by SRA)
to replace the item, but the source code indicates
AD - (Assembled by Depot)
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 "XB" 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
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.
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 750-1.