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 3d 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
If an XB item is not available from salvage, order it using the CAGEC and part number
XC - Installation drawing, diagram, instruction sheet, field service drawing, that is identified by
manufacturer's part number.
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, maybe 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.
Maintenance Code. Maintenance codes tells 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 follows:
F-188.8.131.52 Maintenance Code 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 unit or aviation unit maintenance.
-Unit or aviation unit level 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.