Cannibalization or controlled exchange, when authorized, may be used as a source of
supply for items with the above source codes except for those items source coded XA.
Maintenance Code. Maintenance codes tell you the level(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
THIRD POSITION. 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 the following levels of maintenance:
EXPLANATION OF COLUMNS IN THE REPAIR PARTS LIST AND SPECIAL TOOLS
LIST WORK PACKAGE (Continued).
Do not requisition an XA coded item.
Order the next higher assembly (refer to
If an item is not available from salvage,
order it using the CAGE Code and P/N.
Installation drawings, diagrams, instruction
sheets, field services drawings; identified by
Item is not stocked. Order an XD-coded
item through normal supply channels using
the CAGE Code and P/N given, if no NSN
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 3rd
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