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.
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 Commercial and Government Entity Code
(CAGEC) and part number given.
Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's
Item is not stocked. Order an "XD"-coded item through normal supply channels using the GAGEC and part
number given, if no NSN is available.
(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 organizational or aviation unit maintenance.
-Organizational 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.) This position will contain one of the following maintenance codes.
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.
-Organizational or aviation unit is the lowest level that can do complete repair of the item.
-Direct support or aviation intermediate is the lowest level that can do complete repair of the item.