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 at the Level of maintenance indicated by the
source code. If the 3rd position code of the SMR code authorizes you to
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-coded item. Order its next higher assembly.
(Also, refer to the NOTE below)
If an XB item is not available from salvage, order it using the FSCM/CAGE and part number given.
Installation drawing, diagram, instruction sheet, field service drawing, that is identified by
manufacturers part number.
Item is not stocked. Order an XD-coded item through normal supply channels using the FSCM/CAGE
and part number given, if no NSN is available.
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 as
(a) The maintenance code entered in the third position tells you the lowest maintenance level autho-
rized to remove, replace, and use an end 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 organizational or aviation unit
Organizational or aviation unit category can remove, replace, and use the
Direct support or aviation intermediate level can remove, replace, and use the
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