higher level, order the item from the
higher level of maintenance.
Items with these codes are not to be
The parts that make up the assembled
item must be requisitioned or fabrica-
ted and assembled at the level of
maintenance indicated by the source
If the 3d position of the SMR
code authorizes you to 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.
XA - Do not requisition an "XA" coded item. Order its next
(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 manufac-
turer's 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.
Cannibalization or controlled exchange, when author-
ized, 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
Maintenance code tells you the
level(s) of maintenance authorized to USE and REPAIR support
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,
The maintenance code entered in the
replace, and use and item.
third position will indicate authorization to one of the
following levels of maintenance:
C - Crew or operator maintenance done within organi-
zational or aviation unit maintenance.
O - Organizational or aviation unit level can remove,
replace, and use the item.
F - Direct support or aviation intermediate level can
remove, replace, and use the item.