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TM 10-4930-243-13&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
PB
Stocked items; use the applicable NSN to request/requisition items with these
PC**
source codes. They are authorized to the category indicated by the code
PD
entered in the 3rd position of the SMR code.
PE
PF
**NOTE : Items coded PC are subject to deterioration.
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
KB
the 3rd position of the SMR code. The complete kit must be requisitioned and
applied.
Items with these codes are not to be requested/requisitioned
MO
(Made at Unit/AVUM Level)
individually. They must be made from bulk material which is
MF
(Made at DS/AVIM Level)
identified by the part number in the DESCRIPTION and USABLE
MH
(Made at GS Level)
ON CODE (UOC) column and listed in the Bulk Material group of the
ML
(Made at Specialized Repair
repair parts list in the RPSTL. If the item is authorized to you by the
Activity (SRA))
3rd position code of the SMR code, but the source code indicates it
MD
(Made at Depot)
is made at a higher level, order the item from the higher level of
maintenance.
AO
(Assembled by Unit/AVUM
Items with these codes are not to be requested/requisitioned
Level)
individually. The parts that make up the assembled item must be
AF
(Assembled by DS/AVIM
requisitioned or fabricated and assembled at the level of
Level)
maintenance indicated by the source code. If the 3rd position code
AH
(Assembled by GS Category)
of the SMR code, authorizes you to replace the item, but the
AL
(Assembled by SRA)
source code indicates the items are assembled at a higher level,
AD
(Assembled by Depot)
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 CAGE Code 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 CAGE Code 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.
(2) Maintenance Code. Maintenance codes tell you the level(s) of maintenance authorized to USE and REPAIR
support items. The maintenance codes are entered in the third and fourth positions of the SMR code as follows:
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