C-3. EXPLANATION OF COLUMNS. (Sections II and III). (CONT)
Item is not stocked. Order an "XD" - coded item through normal supply channels using the CAGEC 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 authorized to
remove, replace, and use the support 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 unit or aviation unit maintenance.
Unit or aviation unit category can remove, replace, and use the item.
Direct support or aviation intermediate level can remove, replace, and use theitem.
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.