Change 3 B-3
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 follows:
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
B-3. 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 NOTE below).
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 manufacturers
Item is not stocked. Order an XD-
coded item through normal supply
channels using the CAGE Code and P/
N given, if no NSN is available.
Items with these codes are not to be
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 of