TM 5-4310-378-24P
Explanation
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 code of the SMR code authorizes you to replace the item, but the
source code indicates the items are assembled at a higher level, order the item
from the higher level of maintenance.
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 750-1.
(2)
Maintenance Code. Maintenance codes tells 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 one of 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 intermediate level can remove, replace, and use the item.
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