NAVELEX EE181-AA-OMI-03A/E121 RT1161 M9443
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 category of maintenance indicated by
the source code. If the 3rd( position code of the SMR code authorizes
you to replace the item. but the source code indicates the item is
assembled at a higher category, order the item from the higher category
Do not requisition an "XA"-coded item. Order its next higher assembly. (Also, refer to the NOTE below.)
If an "XB" item is not available from salvage, order it using the FSCM and part number given.
Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's part
Item is not stocked. 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
(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 SM It Code as follows:
(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 organizational or aviation unit maintenance.
Organizational or aviation unit category can remove, replace, and use the item.
Direct support or aviation intermediate category can remove, replace, and use the item.
General support category can remove, replace, and use the item.
Specialized repair activity can remove, replace, and use the item.
Depot category can remove, replace, and use the item.
Change 1 C-3