TM 10-1670-298-20&P
(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:
Source Code
Explanation
PA
Stocked items, use the applicable NSN to request/requisition Items with these
PB
source codes. They are authorized to the category indicated by the code
PC**
entered in the 3rd position of the SMR code
PD
PE
**NOTE Items coded PC are subject to deterioration.
PF
PG
KD
Items with these codes are not to be requested/requisitioned individually. They
KF
are part of a kit which is authorized to the maintenance category indicated in the
KB
3rd position of the SMR code. The complete lot must be requisitioned and
applied.
MO-
(Made at Unit/AVUM
Items with these codes are not to be requested/requisitioned
Level)
individually. They must be made from bulk material which
MF-
(Made at DSIAVUM
is identified by the part number in the DESCRIPTION and
Level)
USABLE ON CODE (UOC) column and listed in the Bulk
MH-
(Made at GS Level)
Material group of the repair parts list in this RPSTL.. If the
ML-
(Made at Specialized
item is authorized to you by the 3rd position code of the SMR
Repair Activity (SRA))
code, but the source code indicates it is made at a higher
MD-
(Made at Depot)
level, order the item from the higher level of maintenance.
AO-
(Assembled by Unit/AVUM
Items with these codes are not to be requested/
Level)
requisitioned individually. The parts that make up
AF-
(Assembled by DS/AVIM
the assembled item must be requisitioned or
Level)
fabricated and assembled at the level of
AH-
(Assembled by GS
maintenance indicated by the source code. If the
Category)
3rd position code of the SMR code authorizes you
AL-
(Assembled by SRA)
to replace the item, but the source code indicates
AD-
(Assembled by Depot)
the items are assembled at a higher level, order the
item from the higher level of maintenance
XA-
Do not requisition "XA"-coded item. Order its next higher assembly. (Refer to the NOTE below)
XB-
If an "XB" item is not available from salvage, order it using the CAGEC and part number given.
XC-
Installation drawing, diagram, instruction sheet, field service drawing, that is identified manufacturer's part
number.
XD-
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.
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 750-1.
C-2
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