Cannibalization or controlled exchanged, 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 item
restricted by requirements of AR 700-42.
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 follow:
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 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
Specialized repair activity can remove, replace, and
use the item.
Depot level can remove, replace, and use the item.
Fourth position. 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.) 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 code. This
position will contain one of the following maintenance 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.