TM 10-5411-231-13&P CARGO BED COVER (CBC) HMMWV, TYPE I 0024 00 REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL) Source Code.  The source code, tells you how to get an item needed for maintenance, repair, or overhaul of an end item/equipment.  Explanation of source codes follows. Source Code             Explanation PA Stock items; use the applicable NSN to request/requisition items PB with these source codes.  They are authorized to the level PC indicated by the code entered in the third position of the SMR code. PD PE NOTE PF Items coded PC are subject to deterioration. PG KD Items with these codes are not to be requested/requisitioned individually. KF They are part of a kit which is authorized to the maintenance level KB indicated in the 3rd position of the SMR code.  The complete kit must be requisitioned and applied. MO-Made at unit/ Items with these codes are not to be requested/requisitioned individually.   AVUM Level They must be made from bulk material that is identified by the MF-Made at DS/ P/N in the DESCRIPTION AND USABLE ON CODE (UOC)   AVIM Level column and listed in the Bulk Material group work package of the RPSTL. MH-Made at GS If the item is authorized to you by the 3rd position code of the SMR code,   Level    but the source code indicates it is made at a higher level, ML-Made at SRA order the item from the higher level of maintenance. MD-Made at Depot AO-Assembled by Items with these codes are not to be requested/requisitioned   Unit/AVUM Level individually.  The parts that make up the assembled item must be AF-Assembled by requisitioned or fabricated and assembled at the level of   DS/AVIM Level maintenance indicated by the source code.  If the third position AH-Assembled by code of the SMR code authorizes you to replace the item, but the   GS level source code indicates the item is assembled at a higher level, AL-Assembled by order the item from the higher level of maintenance.   SRA AD-Assembled by   Depot XA Do not requisition an “XA” coded item.  Order its next higher assembly.  (Also, refer to the   NOTE below.) XB If an item is not available from salvage, order it using the CAGEC and P/N. XC Installation drawings, diagrams, instruction sheets, field service drawings; identified by manufacturer’s P/N. 0024 00-2