(2) Maintenance Code.

TM-5-4320-234-20P Pump Centrifugal Fresh Water: Gasoline Driven 2 Wheel Mounted; 4 In 500 GPM 30 Ft Head (Carver Model K400S) FSN 4320-810-7311 Manual
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TM 5-4320-234-20P Explanation 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 items are assembled at a higher level, order the item from the higher level of maintenance. Code Explanation XA -- Do not requisition “XA" -coded item. Order its next higher assembly. (Also, refer to the NOTE below.) XB -- If an "XB" item is not available from salvage, order it using the FSCM 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 FSCM 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 750-1. (2) Maintenance Code. Maintenance codes tells 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 organizational or aviation unit maintenance. O--Organizational or aviation unit category can remove, replace, and use the item. AO- (Assembled by org/AVUM Level) AF- (Assembled by DS/AVIM Level) AH- (Assembled by GS Category) AL- (Assembled by SRA) AD- (Assembled by Depot) 3

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