TM 9-4520-257-12&P 0042 00
0042 00-2
1. Source Code. The source code tells you how to get an item needed for maintenance, repair, or
overhaul of an end item/equipment. An explanation of source codes follows:
Source Code
Explanation
PA
PB
PC
PD
PE
PF
PG
Stock items; use the applicable NSN to request/requisition
items with these source codes. They are authorized to the level
indicated by the code entered in the 3rd position of the SMR
code.
NOTE: Items coded PC are subject to deterioration.
KB
KD
KF
Items with these codes are not to be requested/requisitioned
individually. They are part of a kit that is authorized to the
maintenance level indicated in the 3rd position of the SMR
code. The complete kit must be requisitioned and applied.
MO - Made at unit/AVUM level
MF- Made at DS/AVIM level
MH - Made at GS level
ML - Made at specialized repair
activity (SRA)
MD - Made at depot
Items with these codes are not to be requested/requisitioned
individually. They must be made from bulk material that is
identified by the P/N in the DESCRIPTION AND USABLE ON
CODE (UOC) column and listed in the bulk material group work
package of the RPSTL. If the item is authorized to you by the
3rd position code of the SMR code, but the source code
indicates it is made at a higher level, order the item from the
higher level of maintenance.
AO - Assembled by unit/AVUM level
AF - Assembled by DS/AVIM level
AH - Assembled by GS level
AL - Assembled by SRA
AD - Assembled by depot
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 item is
authorized to you by the 3rd position code of the SMR code, but
the source code indicates it is made at a higher level, order the
item from the higher level of maintenance.
XA
Do not requisition an "XA" coded item. Order its next higher
assembly. (Also, refer to the NOTE below.)
XB
If the item is not available from salvage, order it using the
CAGEC and P/N.
XC
Installation drawings, diagrams, instruction sheets, field service
drawings that are identified by manufacturer's P/N.
XD
Item is not stocked. Order an "XD" coded item through normal
supply channels using the CAGEC and P/N, 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.
