(1) Source Code. The source code tells you how you get an item needed for maintenance, repair, or
overhaul of an end item/equipment. Source codes are always the first two positions of the SMR code.
Explanations of source codes follow:
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 in the 3d position of the SMR code.
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 3d position of the SMR code. The
complete kit must be requisitioned and applied.
MO - (Made at
Items with these codes are not to be requested/requisitioned individually. They must be
MF - (Made at
made from bulk material which is identified by NSN in the Description column and listed
in the Bulk Material group in the repair parts list in this manual. If the item is authorized
to you by the 3d position code of the SMR code, but the source code indicates it is
MH - (Made at
made at a higher category, order the item from the higher category of maintenance.
MD - (Made at
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
the category of maintenance indicated by the source code. If the 3d position code of the
AH - (Assembled
SMR code authorizes you to replace the item, but the source code indicates the item is
assembled at a higher category, order the item from the higher category of maintenance.
AD - (Assembled
Do not requisition an "XA"-coded item. Order its next higher assembly. (Also, refer to the NOTE
If an "XB" item is not available from salvage, order it using the FSCM and part number given.
Installation drawing, diagram, instruction sheet, field service drawing, that is identified by
manufacturer's part number. Not applicable.
Item is not stocked. Order an "XD"-coded item through normal supply channels using the FSCM 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".
(2) Maintenance Code. Maintenance codes tell you the category(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
(a) The maintenance code entered in the third position tells you the lowest maintenance category
authorized to remove, replace, and use an item. The maintenance code entered in the third position will
indicate authorization to one of the following categories of maintenance.