TM 10-8400-201-23 Section III.  SOURCE, MAINTENANCE AND RECOVERABILITY 1-8.  SOURCE, MAINTENANCE AND RECOVERABILITY (SMR) CODES The SMR Identifies the Source Code (SRC-CD), Maintenance Level and Recoverability Code (RECOV-CD). a. Source Code (first two positions).  The Source Code Is a two-digit code assigned to an item to indicate the manner in which it is to be required for maintenance, repair or overhaul of an end item. CODE EXPLANATION PA Item procured and stocked for anticipated or known usage. PB Item procured and stocked for Insurance purposes because essentiality dictates that a minimum   quantity must be available in the supply system PC Item procured and stocked which otherwise would be coded PA except that it is deteriorative in nature. PD Support   item,   excluding   support   equipment,   procured   for   initial   issue   or   outfittings   and   stocked   only   for subsequent or additional initial issues or outfittings. Not subject to automatic replenishment; i.e.,   installation   kits, Modification Work Order (MWO) kits, and special purpose crew/operator tool kits. PE Support equipment procured and stocked for initial issue or outfitting to specified maintenance repair activities. PF Support equipment which will not be stocked but which will be centrally procured on demand. PG Item  procured  and  stocked  to  provide  sustained  support  for  the  life  of  the  equipment.  It  is  applied  to  an  item peculiar to the equipment which, because of probable discontinuance or shutdown of production facilities, would prove uneconomical to reproduce at a later time. KD 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 KF An item of a maintenance kit and not purchased  separately.  Maintenance  kit  defined  as  a  kit  that  provides  an item that can be placed at unit or Intermediate categories of maintenance. KB Item included In both a depot overhaul repair kit and a maintenance kit. MO Item to be manufactured or fabricated at the unit category of maintenance. MH Item to be manufactured or fabricated at the Intermediate General Support (IGS) maintenance category. ML Item to be manufactured or fabricated at the Specialized Repair Activity (SRA). MF Item to be manufactured or fabricated at the Intermediate Direct Support (IDS) maintenance category. MD Item to be manufactured or fabricated at depot maintenance category. AO Item to be assembled from stock numbered components at the unit category of maintenance. AF Item to be assembled at the IDS maintenance category. AH Item to be assembled at IGS maintenance category. Change 5  1-21