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 coded PC are subject to deterioration.
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 UM
Items with these codes are not to be requested/requisitioned individually.
They must be made from bulk material which is identified by the part number in
MF-(Made at DS/
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
MH-(Made at GS
authorized to you by the 3d position code of the SMR code, but the
source code indicates it is made at a higher level, order the item from the
ML-(Made at Specialized Repair
higher level of maintenance.
MD-(Made at Depot)
AO- (Assembled by
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
AF - (Assembled by
assembled at the level of maintenance indicated by the source code. If the 3d
position code of the SMR code authorizes you to replace the item, but the
AH - (Assembled by
source code indicates the item is assembled at a higher level, order the item
from the higher level of maintenance.
AL - (Assembled by SRA)
AD - (Assembled by Depot)
Do not requisition an XA-coded item. Order its next higher assembly. (Also, refer to the NOTE
If an XBitem is not available from salvage, order it using the CAGE and part number given.
Installation drawing, diagram, instruction sheet, field service drawing, that is identified by the
manufacturers part number.
Item is not stocked. Order an XD-coded item through normal supply channels using the CAGE and part
number given, if no NSN is available.
NOTE: Cannibalization or controlled exchange, when authorized, may be used as source of supply for items with the
above source codes, except for those source coded XAor those aircraft support items restricted by requirements of AR
(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
(a) The maintenance code entered in the third position tells you the lowest maintenance level
authorized to remove, replace, and use an item. The maintenance code entered in the third position will indicate
authorization to one of the following levels of maintenance.
Crew or operator maintenance done within unit maintenance or aviation unit maintenance.
Unit maintenance or aviation unit category can remove, replace, and use the item.
Direct Support or aviation intermediate level can remove, replace, and use the item.
General support level can remove, replace, and use the item.
Specialized repair activity can remove, replace, and use the item.
Depot level can remove, replace, and use the item.
(b) The maintenance code entered in the fourth position tells whether or not the item is to be
repaired and identifies the lowest maintenance level with the capability to do complete repair (i.e., perform all authorized
repair functions.) (NOTE: Some limited repair may be done on the item at a lower level of maintenance, if authorized by
the Maintenance Allocation Chart (MAC) and SMR codes.) This position will contain one of the following maintenance