Items with these codes are not to be requested/requisitioned individually. They
must be made from bulk material which is identified by the part number in the
DESCRIPTION AND USABLE ON CODE (UOC) column and listed in the Bulk
Material group of the repair parts list in this RPSTL. If the item is authorized to
you by the 3d position code of the SMR code, but the source code indicates it is
made at a higher level, order the item from the higher level of maintenance.
Items with these codes are not to be requested/requisitioned 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 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 higher assembly. (Also, refer to the NOTE below.)
XB - If an "XB" item is not available from salvage, order it using the CAGEC 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 CAGEC 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 700-42.
Change 1 C-3