ARMY TM 10-1670-294-23&P
AIR FORCE T.O. 13C5-33-2
NAVY NAVAIR 13-1-34
Do not requisition an "XA" - coded item. Order its next higher assembly (Also
refer to the NOTE below.)
If an "XB" item Is not available from salvage, order it using the FSCM and part
Installation drawing, diagram, instruction sheet, field service drawing, that is
identified by manufacturer's part number.
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 700-42.
(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
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
Crew or operator maintenance done within organizational or aviation unit
Organizational or aviation unit category can remove, replace, and use the Item
Direct support or aviation Intermediate level can remove, replace, and use the
General support level can remove, replace, and use the Item.
Specialized repair activity can remove, replace, and use the Item
Depot level can remove, replace, and use the item.
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 the
item at a lower level of maintenance, if authorized by the Maintenance Allocation Chart (MAC)
and SMR code ) This position will contain one of the following maintenance codes.