TM 9-4520-260-23P
(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 follow:
Code
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.
**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 3d position of the SMR code. The complete kit must be
requisitioned and applied.
Items 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 indicated 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.
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 from salvage, order it using the FSCM and part number given.
XC - Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's
part number.
XD - Item is not stocked. Order an "XD"-coded item through normal supply channels using the FSCM 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.
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