AO - (Assembled by
AF - (Assembled by
AH - (Assembled by
AD - (Assembled by
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 items are assembled at a higher level, order the item from the
higher level of maintenance.
XA - - Do not requisition XA-coded item. Order its next higher assembly. (Also, refer to the NOTE below.)
XB - - If an XB item is not available from salvage, order it using the FSCM and part number given.
XC- - Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturers part
XD - - Item is not shocked. Order an XD-coded item through normal supply channels using the FSCM 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 750-1.
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:
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.
C - Crew or operator maintenance done within organizational or aviation unit maintenance.
O - Organizational or aviation unit category can remove, replace, and use the item.