TM 55-4920-430-30P
(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:
Code
Explanation
Code
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.
Explanation
Items with these codes are not to be requested requisitioned individual-
ly, 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.
Code
Explanation
Items with these codes are not to be requested/requisitioned individual-
ly. 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.
2
