TM 5-6675-319-24P
Items with these codes are not to be requested/requisitioned
AO (Assembled by org/
individually. The parts that make up the assembled item must be
AVUM Level)
requisitioned or fabricated and assembled at the level of
AF (Assembled by
maintenance indicated by the source code. If the 3rd position code
DS/AVIM
of the SMR code, authorizes you to replace the item, but the
Level)
source code indicates the items are assembled at a higher level,
AH (Assembled by GS
order the item from the higher level of maintenance.
Category)
AL (Assembled by SRA)
AD (Assembled by Depot)
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 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.
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 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
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 organizational or aviation unit maintenance.
O - Organizational or aviation unit category can remove, replace, and use the item.
F - Direct support or aviation maintenance can remove, replace, and use the item.
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