DEFINITIONS AND APPLICATION OF SOURCE MAINTENANCE
Source codes are assigned to support items to indicate the manner of acquiring the
item for maintenance or overhaul of end items. Source codes are entered in the
first and second position of the SMR code.
SERIES A: ASSEMBLE, COMPLETE ASSEMBLY NOT STOCKED
Code "A" entered in the first position of the source code applies to items that are
not procured as assemblies but are assembled within the Marine Corps prior to
installation. The code entered in the second position designates the lowest echelon
authorized to assemble the item. All the parts used in the assembly will be "P" coded.
Assemble at organizational maintenance level 2nd echelon.
Assemble at field maintenance level 3rd echelon.
Assemble at field maintenance level 4th echelon.
Assemble at depot maintenance level 5th echelon.
SERIES K: ITEMS OF A KIT, NOT PURCHASED SEPARATELY
An item of depot overhaul/repair kit and not purchased separately. Depot kit
defined as a kit that provides items required at the time of overhaul or repair.
An item of a maintenance kit and not purchased separately. Maintenance kit defined
as a kit that provides an item that can be replaced at organizational or intermediate
levels of maintenance.
Items included in both a depot overhaul/repair kit and a maintenance kit.
SERIES M: MANUFACTURE, PARTS NOT PROCURED
Code "M" entered in the first position of the source code applies to items that are
not procured but are capable of being fabricated or manufactured within the Marine
Corps. These items have relatively low usage and will generally be fabricated or
manufactured only as required for immediate repair or replacement. The code entered
in the second position designates the lowest echelon authorized to manufacture or
fabricate the item. Units will requisition the bulk materiel under the NSN's and the
quantities indicated to effect the fabrication or manufacture of the item.
Manufacture or fabricate at organizational maintenance level 2nd echelon.
Manufacture or fabricate at field maintenance level 3rd echelon.
Manufacture or fabricate at field maintenance level 4th echelon.
Manufacture or fabricate at depot maintenance levql 5th echelon.