TM 11-5895-1038-24P/TO 31R2-2TSC-134
Source, Maintenance, and Recoverability (SMR) Codes.
(1) Source code. Source codes indicate the manner of acquiring
support items for maintenance, repair, or overhaul of end items.
codes are entered in the first and second positions of the Uniform SMR
Code format as follows:
PA -- Item procured and stocked for anticipated or known usage.
PB -- Item procured and stocked for insurance purpose because essentiality
dictates that a minimum quantity be available in the supply
PD -- Support item, excluding support equipment, procured for initial
issue or outfitting and stocked only for subsequent or additional
initial issues or outfittings.
Not subject to automatic re-
MD -- Item to be manufactured or fabricated at the depot maintenance
AD -- Item to be assembled at depot maintenance level.
XA -- Item is not procured or stocked because the requirements for the
item will result in the replacement of the next higher assembly.
XB -- Item is not procured or stocked.
If not available through salvage,
XD -- A support item that is not stocked. When required, item will be
procured through normal supply channels.
Cannibalization or salvage may be used as a source
of supply for any items source coded above except
those coded XA and aircraft support items as re-
stricted by AR 700-42.
(2) Maintenance code.
Maintenance codes are assigned to indicate
the levels of maintenance authorized to USE and REPAIR support items.
The maintenance codes are entered in the third and fourth positions of
the Uniform SMR Code format as follows:
(a) The maintenance code entered in the third position will
indicatethe lowest maintenance level authorized to remove, replace, and
use the support item. The maintenance code entered in the third position
will indicate one of the following levels of maintenance: