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TM 9-5855-252-24P
Explanation
Code
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 item is assembled at a higher
level, order the item from the higher level of maintenance.
Order its next higher assembly.
X A - Do not requisition an "XA"-coded item.
(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 chan-
nels 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 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.
Application/Explanation
Code
- Crew or operator maintenance done within organizational or
c
aviation unit maintenance.
- Organizational or aviation unit level can remove, replace
o
and use the item.
- Direct support or aviation intermediate level can remove,
F
replace, and use the item.
- General support level can remove, replace, and use the item.
H
- Specialized repair activity can remove, replace, and use the
L
item.
3

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