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 in1he 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.
(Made at Unit/AVUM Level)
(Made at DSIAVIM Level)
(Made at GS Level)
(Made at Specialized Repair
(Made at Depot)
(Assembled by Unit/AVUM
(Assembled by DS/AVIM
(Assembled by GS Category)
(Assembled by SRA)
(Assembled by Depot)
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 3rd 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 the3rd
position code of the SMR code authorizes you to replace the item, but the
source code indicates the items are assembled at a higher level, order the item
from the higher level of maintenance.
Do not requisition "XA"-coded item. Order its next higher assembly. (Refer to the NOTE below.)
If an "XB" item is not available from salvage, order it using the CAGEC and part number given.
Installation drawing, diagram, instruction sheet, field service drawing, that is identified manufacturer's part number.
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 lose aircraft support items restricted by requirements of AR