TM 5-4930-244-24P
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Source Code. The source code tells you how you get an item needed for maintenance, repair, or
overhaul of an end item/equipment. Explanations of source codes follow:
Source Code
Application/Explanation
PA
Stock items; use the applicable NSN to
PB
requisition/request items with these source codes.
PC
They are authorized to the level indicated by the
code entered in the 3rd position of the SMR code.
PD
PE
NOTE
PF
PG
KD
Item with these codes are not to be
KF
requested/requisitioned individually. They are part of
KB
a kit which is authorized to the maintenance level
indicated in the 3rd position of the SMR code. The
complete kit must be requisitioned and applied.
MO Made at unit/AVUM level
Items with these codes are not to be
MF Made at DS/AVIM level
requisitioned/requested individually. They must be
MH Made at GS level
made from bulk material which is identified by the
ML Made at SRA
P/N in the DESCRIPTION AND USABLE ON CODE
MD Made at depot
(UOC) column and listed in the bulk material group
work package of the 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 higher level,
order the item from the higher level of maintenance.
AO Assembled by unit/AVUM level
Items with these codes are not to be
AF Assembled by DS/AVIM level
requested/requisitioned individually. The parts that
AH Assembled by GS level
make up the assembled item must be requisitioned
AL Assembled by SRA
or fabricated and assembled at the level of
maintenance indicated by the source code. If the 3rd
AD Assembled by depot
position 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 the
next higher assembly. (Refer to the NOTE below.)
XB
If an item is not available from salvage, order it using
the CAGEC and P/N.
XC
Installation drawings, diagrams, instruction sheets,
field service drawings; identified by manufacturer's
P/N.
XD
Item is not stocked. Order an XD-coded item
through normal supply channels using the CAGEC
and P/N 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 items source coded "XA"
or those aircraft support items restricted by requirements of AR 750-1.
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