ARMY TM 10-1670-279-23&P
AIR FORCE T.O. 13C5-27-2
NAVY NAVAIR 13-1-28
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 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
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
manufacturer's 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 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 one
of the following levels of maintenance.
C Crew or operator maintenance done within unit or aviation unit maintenance.
O Unit or aviation unit category can remove, replace, and use the Item.
Direct support or aviation intermediate level can remove, replace, and use the item.
H General support level can remove, replace, and use the item.
Specialized repair activity can remove, replace, and use the item.
D Depot level can remove, replace, and use the item.
AH-(Assembled by GS