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.
AD - (Assembled by
XA - Do not requisition an XA-coded item.
Order its next higher assembly. (Also refer to the NOTE
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 number.
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 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.
C -Crew or operator maintenance done within organizational maintenance.
O -Organizational category can remove, replace, and use the item.
F -Direct support category can remove, replace, and use the item.
H -General support category can remove, replace, and use the item.
L -Specialized repair activity can remove, replace, and use the item.
D -Depot category can remove, replace, and use the item.
(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.
O -Organizational is the lowest category that can do complete repair of the item.
F -Direct support is the lowest category that can do complete repair of the item.
H -General support is the lowest category that can do complete repair of the item.