(1) Source Code. The source code tells you how to
get an item needed for maintenance, repair or overhaul
of an end item/equipment. Explanations of source codes
Stocked items; use the applicable NSN to
request/requisition items with these
source codes. They are authorized to the
catagory indicated by the code entered in
3d position of the SMR code.
**Items coded PC are subject to deterioration.
Items with these codes are not to be
requested/requisitioned individually. They
are part of a kit which is authorized to the
maintenance category indicated in the
position of the SMR code. The complete kit
must be requisitioned and applied.
MO -(Made at UM
Items with these codes are not to
be requested/requisitioned indi-
MF -(Made at DS/
vidually. They must be made
from bulk material which is iden-
tiflied by the part number in the
DESCRIPTION AND USABLE ON
CODE (UOC) column and listed in
the Bulk Material group
of the repair parts list in this
RPSTL. If the item is authorized
to you by the 3d position code of
the SMR code, but if the MD
source code indictes it is made
at a higher level, order the item
AO -(Assembled by
Items with these codes are not
individually The parts that
make up the assembled item
must be requistioned or fabricated
and assembled at the level
AH -(Assembled by
of manintenance indicated by
the source code. If the 3d position
code of the SMR code by
authorizes you to replace the
item, but the source code indi-
cates the item is assembled at a
bled at a higher level, order the
item from the higher level of
Do not requisition an "XA"-coded Item. Order its
next higher assembly. (Also, refer to the NOTE
If an "XB" item is not available from salvage
order it using the CAGE and part number given
Installation drawing, diagram, instruction sheet,
field service drawing, that is identified by the
manufacturers part number.
Item is not stocked. Order an "XD"- coded item
through normal supply channels using the CAGE
and part number given, if no NSN is available.
NOTE: Cannibalization or controlled exchange, when
authorized, may be used as 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
(a) The maintenance code entered in the third
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
Crew or operator maintenance done within
unit or aviation unit maintainance.
Unit maintenance or aviation unit category
can remove, replace and use the item.
Direct support or aviation intermediate
level can remove, replace and use the item.
General support level can remove, replace
and use the item.
Specialized repair activity can remove, replace
and use the item.