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REPAIR PARTS AND SPECIAL TOOLS LIST, INTRODUCTION
Maintenance Code - TM-9-4520-257-12P_183

TM-9-4520-257-12P Compressor Air Rotary Diesel Engine Driven Skid Mounted 125 cfm at 100 psi Manual
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TM 9-4520-257-12&P                                                     0042 00 0042 00-2 1.    Source Code.  The source code tells you how to get an item needed for maintenance, repair, or overhaul of an end item/equipment.  An explanation of source codes follows: Source Code Explanation PA PB PC PD PE PF PG Stock items; use the applicable NSN to request/requisition items with these source codes. They are authorized to the level indicated by the code entered in the 3rd position of the SMR code.   NOTE: Items coded PC are subject to deterioration.   KB KD KF Items with these codes are not to be requested/requisitioned individually.  They are part of a kit that is authorized to the maintenance level indicated in the 3rd position of the SMR code.  The complete kit must be requisitioned and applied. MO - Made at unit/AVUM level MF- Made at DS/AVIM level MH - Made at GS level ML - Made at specialized repair activity (SRA) MD - Made at depot Items with these codes are not to be requested/requisitioned individually.  They must be made from bulk material that is identified by the P/N in the DESCRIPTION AND USABLE ON CODE (UOC) column and listed in the bulk material group work package of the RPSTL.  If the item is authorized to you by the 3rd 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. AO - Assembled by unit/AVUM level AF - Assembled by DS/AVIM level AH - Assembled by GS level AL - Assembled by SRA   AD - Assembled by 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 maintenance indicated by the source code.  If the item is authorized to you by the 3rd 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. XA Do not requisition an "XA" coded item.  Order its next higher assembly.  (Also, refer to the NOTE below.) XB If the item is not available from salvage, order it using the CAGEC and P/N. XC Installation drawings, diagrams, instruction sheets, field service drawings that are identified by manufacturer's P/N. XD Item is not stocked.  Order an "XD" coded item through normal supply channels using the CAGEC and P/N, 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.







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