AO- (Assembled by
AF- Assembled by
Items with these codes are not to be requested/requisitioned individual-
ly. The parts that make up the assembled item must be requisitioned or
AH- (Assembled by
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
AL- (Assembled by
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,
AD- (Assembled by
XA - Do not requisition an "XA"-coded item. Order its next higher assembly. (Also. refer to the NOTE below.)
If an "X B" 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 manufacturer's part
XD - 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.
NOTE: 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 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:
(a) 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 organizational or aviation unit
-Organizational or aviation unit category can remove, replace, and use the item.
-Direct support or aviation intermediate level can remove, replace, and use the
-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.
(b) The maintenance code entered in the fourth position tells whether or not the item is to be repaired and identifies
the lowest maintenance level with the capability to do complete repair (i.e., perform all authorized repair functions.)
(NOTE: Some limited repair may be done on the item at a lower level of maintenance, if authorized by the Maintenance
Allocation Chart (MAC) and SMR codes.) This position will contain one of the following maintenance codes.