AO-(Assembled by Org
Items with these codes are not to be requested/requisitioned individually.
AF-(Assembled by DS
The parts that make up the assembled item must be requisitioned or
fabricated and assembled at the level of maintenance indicated by the
AH-(Assembled by GS
source code. If the 3d position code of the SMR code authorizes you to
replace the item, but the source code indicates the item is assembled at
AL-(Assembled by SRA)
a higher level, order the item from the higher level of maintenance.
AD-(Assembled by Depot)
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 FSCM and part number given.
XC - Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's
XD - 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" or those aircraft support items restricted by
requirements of AR 700-42.
(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
(a) The maintenance code entered in the 3d position tells you the lowest maintenance level
authorized to remove, replace, and use an item. The maintenance code entered in the 3d position will indicate
authorization to one of the following levels of maintenance.
- Crew or operator maintenance done within organizational or aviation unit
- Organizational or aviation unit level can remove, replace and use the item.
- Direct support or aviation intermediate level can remove, replace, and use
- 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.