Items with these codes are not to be requested/requisitioned
AO - (Assembled by
individually. The parts that make up the assembled item must be
requisitioned or fabricated and assembled at the category of
AF - (Assembled by
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
AH - (Assembled by
from the higher category 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 FSCM and part number given.
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".
(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 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
- Organizational category can remove, replace, and use the
- Direct support category can remove, replace, and use the
- General support category can remove, replace, and use the
(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). (NOTE: 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.) This
position will contain one of the following maintenance codes.