X A -
Do not requisition an "XA-coded item. Order its next higher assembly. (Also, refer to the NOTE
If an XB item is not available from salvage, order it using the Commercial and Government Entity
(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 CAGE and
part number given, if no NSN is available.
N O T E
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.
(2) Maintenance Code. Maintenance codes tell you the category(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 third position tells you the lowest maintenance category
authorized to remove, replace, and use an item. The maintenance code entered in the third position will indicate
authorization to one of the following categories of maintenance.
Crew or operator maintenance done within unit maintenance.
Unit category can remove, replace, and use the item.
Direct support category can remove, replace, and use the item.
General support category can remove, replace, and use the item.
Depot category can remove, replace, and use the item.
(b) The maintenance code entered in the fourth position tells you whether or not the item is to be
repaired and identifies the lowest maintenance category with the capability to do complete repair (i.e., perform all
authorized repair functions). This position will contain one of the following maintenance codes.
N O T E
Some limited repair may be done on the item at a lower category of maintenance, if authorized by
the Maintenance Allocation Chart (MAC) and SMR codes.
Unit is the lowest category that can do complete repair of the item.
Direct support is the lowest category that can do complete repair of the item.
General support is the lowest category that can do complete repair of the item.
Depot is the lowest category that can do complete repair of the item.
Nonreparable. No repair is authorized.
No repair is authorized. (No parts or special tools are authorized for the maintenance of a B coded
item.) However, the item may be reconditioned by adjusting, lubricating, etc., at the user level.