Items with these codes are not to be requested/requisi-
tioned individually. The parts that make up the assembled
item must be requisitioned or 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 replace the item, but the source code indicates the
items are 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 higher assembly. (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 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.
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
Maintenance codes tells you the level(s) of mainte-
nance authorized to USE and REPAIR support items.
codes are entered in the third and fourth positions of the SMR code
(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 maintenance.
--Organizational or aviation unit category can remove,
replace, and use the item.
--Direct support or aviation intermediate level can remove,
replace, and. use the item.