TM 5-3810-300-34P Code Application/Explanation PA Stocked items; use the applicable NSN to request/requisition items with these source codes. They PB are authorized to the category indicated by the code entered in the 3d position of the SMR code. PC** PD PE PF **Items coded PC are subject to deterioration. PG deterioration. Items with these codes are not to be requested/requisitioned individually. They are part of a kit which KD is authorized to the maintenance category indicated in the 3d position of the SMR code. The complete kit KF must be requisitioned and applied. KB MO-(Made at UM/ Items with these codes are not to be requested/requisitioned individually.  They must be made AVUM Level) from bulk material which is identified by the part number in the DESCRIPTION AND USABLE MF- (Made a DS/ ON CODE (UOC) column and listed in the Bulk Material group of the repair parts list in this AVUM Level) RPSTL. If the item is authorized to you by the 3d position code of the SMR code, but the source MH- (Made at GS code indicates it is made at a higher level, order the item from the higher level of maintenance. (Level) ML-(Made at Specialized Repair Activity (SRA)) MD-(Made at 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 AO-(Assembled by maintenance indicated by the source code. If the 3d position code of the SMR code authorizes UM/AVUM you to replace the item, but the source code indicates the item is assembled at a higher level, Level) order the item from the higher level of maintenance. AF- (Assembled by DS/AVIM Level) AH- Assembled by GS Category) AL-(Assembled by SRA) AD-(Assembled by Depot) XA -    Do not requisition an "XA"-coded item. Order its next higher assembly. (Also refer to the NOTE following.) XB -    If an "XB" item Is not available from salvage, order It using the FSCM or CAGE and part number given. XC -    Installation drawing, diagram, instruction sheet, field service drawing, that is identified by the manufacturer’s part number. XD -    Item is not stocked. Order an "XD"-coded item through normal supply channels using the FSCM or CAGE 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" or those aircraft support items restricted by requirements of AR 700-42. (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 third and fourth positions of the SMR code as follows: (a) The maintenance code entered in the third position tells you the lowest maintenance level authorized to remove, replace, and use an item. The maintenance code entered in the third position will indicate authorization to one of the following levels of maintenance. Code Application/Explanation C - Crew or operator maintenance done within unit maintenance or aviation unit maintenance. O - Unit maintenance or aviation unit category can remove, replace, and use the item. F - Direct support or aviation intermediate 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. (b) The maintenance code entered in the fourth position tells whether or not the item is to be repaired and identifies the lowest maintenance level with the capability to do complete repair (i.e., perform all authorized repair functions). (NOTE: Some limited repair may be done on the item at a lower level of maintenance, if authorized by the Maintenance Allocation Chart (MAC) and SMR codes.) This position will contain one of the following maintenance codes: Code Application/Explanation O - Unit maintenance or aviation unit is the lowest level that can do complete repair of the item. Change 1  2