AO-Assembled by unit/
AF-Assembled by DS/
AH-Assembled by GS
AL-Assembled by SRA
AD-Assembled by depot
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 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 maintenance.
Do not requisition an XA" coded item. Order the next higher assembly. (Refer to
If an item is not available from salvage, order it using the CAGEC and P/N.
Installation drawings, diagrams, instruction sheets, field service drawings; identified
by manufacturer's P/N
Item is not stocked. Order an XD-coded item through normal supply channels using
the CAGEC and P/N 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 items source
coded "XA" or those aircraft support items restricted by requirements of AR 750-1.
Source Code. The source code tells you how to obtain an item needed for maintenance, repair, or
overhaul of an end item/equipment. Explanations of source codes follow:
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 maintenance: