AO-Assembled by unit/AVUM level
Items with these codes are not to be requested/requisitioned individually.
AF-Assembled by DS/AVIM level
The parts that make up the assembled item must be requisitioned or
AH-Assembled by GS level
fabricated and assembled at the level of maintenance indicated by the
AL-Assembled by SRA
source code. If the 3rd position of the SMR code authorizes you to
AD-Assembled by depot
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.
Do not requisition an "XA" code item. Order the next higher assembly.
(Refer to the NOTE below.)
If an item is not available from salvage, order it using the CAGEC and
Installation drawings, diagrams, instruction sheets, field service
drawings; identified by manufacturer's P/N.
Item is not stocked. Order an XD-coded item through normal supply
channels using the CAGEC and part number given, if no NSN is
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.
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:
Third Position. 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 the following levels of maintenance:
Unit level/AVUM maintenance can remove, replace, and use the item.
Direct support/AVIM maintenance can remove, replace, and use the item.
General support maintenance can remove, replace, and use the item.
Specialized repair activity can remove, replace, and use the item.
Contractor facility can remove, replace, and use the item.
Depot can remove, replace, and use the item.
*NOTE Army may use C in the third position. However, for joint service publications, Army will use O.