Do not requisition "XA"-coded item Order Its next higher assembly (Refer to the NOTE below)
If an "XB" Item is not available from salvage, order it using the CAGEC and part number given
Installation drawing, diagram, instruction sheet, field service drawing, that Is identified manufacturer's part
Item is not stocked Order an "XD"-coded Item through normal supply channels using the CAGEC and part
number given, lf 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 the following levels of maintenance
C- Crew or operator maintenance done within unit/AVUM maintenance
O- Unit level/AVUM maintenance can remove, replace, and use the item
Direct support/AVIM maintenance can remove, replace, and use the Item
H- General support maintenance can remove, replace, and use the Item.
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
Some limited repair may be done on an Item at a lower level of
maintenance, If authorized by the Maintenance Allocation Chart and