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TM 3-1040-279-12&P
XA-
Do not requisition an "XA"-coded item.
(1) Source Code. The source code tells you
Order its next higher assembly (also refer
how to get an item needed for maintenance,
to the NOTE below).
repair, or overhaul of an end item/equipment.
Explanation of source codes follow:
If an "XB" item is not available from
XB -
EXPLANATION
salvage, order it using the FSCM and part
CODE
number given.
Stocked items; use the
application NSN to
PA
XC - Installation drawing, diagram, instruction
request/requisition items with
PB
sheet, field service drawing, that is
PC**
these source codes. They are
identified by manufacturer's part number.
PD
authorized to the category
indicated by the code entered in
PE
XD -
Item is not stocked. Order an "XD"-coded
the 3rd position of the SMR
PF
item through normal supply channels
code.
PG
using the FSCM and part number given, if
no NSN is available.
"NOTE: Items coded PC are
subject to deterioration.
NOTE: Cannibalization or controlled exchange,
Items with these codes are not
when authorized, may be used as a source of
to be requested/requisitioned
supply for items with the above source codes,
individually. They are part of a
KD
except for those source coded "XA".
kit which is authorized to the
KF
maintenance category indicated
KB
(2) Maintenance Code. Maintenance codes
in the 3rd position of the SMR
tell you the level(s) of maintenance authorized to
code. The complete kit must be
USE and REPAIR support items. The maint-
requisitioned and applied.
enance codes are entered in the third and fourth
positions of the SMR Code as follows:
Items with these codes are not
to be requested/requisitioned
(a)  The maintenance code entered in
individually. They must be made
MO-(Made at
the third position tells you the lowest maintenance
from bulk material which is
org/AVUM level)
level authorized to remove, replace, and use an
identified by the part number in
MF-(Made at
item. The maintenance code entered in the third
the DESCRIPTION AND
DS/AVIM Level
USABLE ON CODE (UOC)
position will indicate authorization to one of the
MH-(Made at GS
column and listed in the Bulk
Level)
following levels of maintenance.
Material group of the repair
ML-(Made at
Code
Application/Explanation
parts list in the RPSTL. If the
Specialized
item is authorized to you by the
Repair Act
Crew or operator maintenance done
C
-
3rd position code of the SMR
(SRA)
within organizational or aviation unit
code, but the source code
MD-(Made at
maintenance.
indicates it is made at a higher
Depot)
level, order the item from the
Organizational or aviation unit
O
-
higher level of maintenance.
category can remove, replace, and
use the item.
Items with these codes are not
to be requested/requisitioned
F
-
Direct support or aviation
AO-(Assembled
individually. The parts that make
intermediate level can remove,
by org/AVUM
up the assembled item must be
replace, and use the item.
Level)
requisitioned or fabricated and
AF-(Assembled
assembled at the level of
H
-
General support level can remove,
by DS/AVIM
maintenance indicated by the
replace, and use the item.
Level)
source code. If the 3rd position
AH-(Assembled
Specialized repair activity can
L
-
code of the SMR code
by GS Level)
remove, replace, and use the item.
authorized you to replace the
AL-(Assembled
item, but the source code
D
-
Depot level can remove, replace,
by SRA)
indicates the item is assembled
and use the item.
AD-(Assembled
at a higher level, order the item
by Depot)
from the higher level of
maintenance.
F-2

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