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TM 5-4320-313-24P
AO (Assembled by org
Items with these codes are not to be requested/requisitioned
AVUM
individually. The parts that make up the assembled item must be
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/AVUM
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 CAGE Code 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 CAGE Code 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 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.
Maintenance
Code
Application/Explanation
C - Crew or operator maintenance done within unit/AVUM maintenance.
O - Unit level VAVUM maintenance can remove, replace, and use the item.
F - Direct support/AVIM maintenance can remove, replace, and use the item.
H - General support maintenance can remove, replace, and use the item.
L - Specialized repair activity can remove, replace, and use the item.
D - Depot can remove, replace, and use the item.
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