(1)  Source Code.  The source code tells you how to get an item needed for maintenance, repair, or overhaul of an end item/equipment. Explanations of source codes follow: Code PA PB PC^] PD PE PF PG KD KF KB MO-   (Made at Unit Level) MF-    (Made at DS Level) MH-   (Made at GS Level) ML-    (Made at Specialized Repair Activity (SRA)) MD-   (Made at Depot) AO-    (Assembled by Unit Level) AF- (Assembled by DS Level) AH-    (Assembled by GS Level) AL- (Assembled by SRA) AD-    (Assembled by Depot) Explanation Stocked items: use the applicable NSN to request/requisition items with these source codes. They are authorized to the category indicated by the code entered in the 3d position of the SMR code. ^]NOTE:  Items coded PC are subject to deterioration. Items with these codes are not to be requested/requisitioned individually. They are part of a kit which is authorized to the maintenance category indicated in the 3d position of the SMR code. The complete kit must be requisitioned and applied. Items with these codes are not to be requested/requisitioned individually. They must be made from bulk material which is identified by the part number in the DESCRIPTION AND USABLE ON CODE (UOC) column and listed in the bulk material group of the repair parts list in the RPSTL. If the item is authorized to you by the 3d 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. 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 3d position code of the SMR code authorizes you to replace the item, but the source code indicates the item is assembled 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 an XB-coded  item is not available from salvage, order it using the CAGEC and part number given. XC- Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer’s part number. XD-    Item is not stocked. Order an XD-coded item through normal supply channels using the CAGEC and part number given 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. (2)  Maintenance Code.  Maintenance codes tell you the level(s) of maintenance authorized to USE and REPAIR support items. The maintenance codes are entered in the 3d and 4th positions of the SMR code as follows: (a)  The maintenance code entered in the 3d position tells you the lowest maintenance level authorized to remove, replace, and use an item. The maintenance code entered in the 3d position will indicate authorization to one of the following levels of maintenance. Code Application/Explanation C –  Crew or operator maintenance done within unit maintenance. O –  Unit level can remove, replace, and use the item. F –  Direct support level can remove, replace, and use the item. H –  General support level can remove, replace, and use the item. L –  Specialized repair activity can remove, replace, and use the item. D –  Depot level can remove, replace, and use the item. 2 TM 9-2815-237-34P } } } }