TM 10-1670-295-23&P
Code
Explanation
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 CAGE Code and part number
given.
XC--
Installation drawing, diagram, instruction sheet, field service drawing, that is identified by
manufacturer's part number.
XD--
Item is not stocked. Order an "XD"-coded item through normal supply channels using the CAGE
Code and part number given, if no NSN is available.
NOTE
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 750-1
(2) 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:
(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 the following levels of maintenance.
Code
Application/Explanation
C -
Crew or operator maintenance done within unit/AVUM maintenance.
O -
Unit level VAVUM maintenance can remove, replace, and use the item.
F -
Direct support/AVIM maintenance can remove, replace, and use the item.
H -
General support maintenance can remove, replace, and use the item.
L -
Specialized repair activity can remove, replace, and use the item.
D -
Depot can remove, replace, and use the item.
(b)
The maintenance code entered in the fourth position tells whether or not the item is to be
repaired and identifies the lowest maintenance level with the capability to do complete repair
(i.e., perform all authorized repair functions). (NOTE Some limited repair may be done on an
item at a lower level of maintenance, if authorized by the Maintenance Allocation Chart (MAC)
and SMR codes). This position will contain one of the following maintenance codes.
C-3
