1-8. SOURCE, MAINTENANCE AND RECOVERABILITY (SMR) CODES- continued CODE EXPLANATlON AL item to be assembled at the SRA. AD Item to be assembled at depot maintenance category. 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, requisition. xc Installation  drawing,  diagram,  instruction  sheet,  field  service  drawing,  that  is  identified  by  manufac- turer’s part number. XD A low mortality support item that is not stocked When required, items will be requested and pro- vided through normal supply channels. b. Maintenance Use Code (third position). This position will indicate the lowest maintenance category authorized to remove, replace, and use the support item. The  maintenance  use entered in the third position will indicate one of the following categories of maintenance. CODE EXPLANATION o Support  item  is  removed,  replaced,  and  used  at  organizational  (or  AVUM/ON-SITE)  category  of maintenance. F Support  item  is  removed,  replaced,  and  used  at  direct  support  (or  AVIM/OFF-SITE)  category  of maintenance. H Support item is removed, replaced, and used at general support (or AVIM/OFF-SITE) category of maintenance. D Support item is removed, replaced, and used only at depot. c. Maintenance Repair Code (fourth position). This position will indicate whether or not the item is to be re- paired, and will identify the lowest category with the capability to perform complete repair. This complete repair excludes overhaul or rebuild functions prescribed by Depot Maintenance Work Requirements (DMWR), but encompasses performing all other authorized maintenance functions, services (inspect, test, service adjust, align,  calibrate),  or  actions  (welding,  grinding,  riveting,  straightening,  facing,  remachining,  or  resurfacing)  re- quired to restore an item to serviceable condition by correcting specific failures or damage. Complete repair coding does not preclude repair which may be authorized to a lower category of maintenance. The MRC en- tered in the fourth position will indicate one of the following: CODE APPLICATION/EXPLANATION o The unit (AVUM/ON-SITE) category of maintenance is the lowest level capable of complete repair. F The IDS (AVIM/OFF-SITE) category of maintenance is the lowest level capable of complete repair. H The IGS (AVIM/OFF-SITE) category of maintenance is the lowest level capable of complete repair. L The SRA is the lowest activity capable of complete repair. 1-20  Change  6 TM  10-8400-203-23