a. 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 are shown in Table 1.
Table 1. Source Code Definitions
PA, PB, PC**, PD, PE, PF, PG
Stocked items; use an 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.
** Items coded PC are subject to deterioration.
KD, KF, KB
Items with these codes are not to be requested/requested/ requisitioned
individually. They are part of a kit that is authorized to be 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 Level
MF - Made at DS/AVIM Level
MH - Made at GS Level
ML - Made at SRA
MD - Made at Depot
Items with these codes are not to be requested/requisitioned individually. They
must be made from bulk material that 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.
AO - Assembled by Unit/AVUM
AF - Assembled by DS/AVIM
AH - Assembled by GS Level
AL - Assembled by SRA
AD - Assembled by Depot
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 3rd 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.
Do not requisition an XA - coded item. Order its next higher assembly. (Also,
refer to the NOTE below.)
If an XB item is not available from salvage, order it using the CAGEC and
Installation drawing, diagram, instruction sheet, field service drawing, that is
identified by manufacturers part number.
Item is not stocked. Order an XD - coded item through normal supply
channels using the Commercial and Government-Entity (CAGEC) code and
part number given.
NOTE: Cannibalization or controlled exchange, when authorized, may be used as a source of supply for items
with the above XA, XB, XC, and XD source codes, except for those source coded XA.