TM 10-3930-620-24P 6. How to Locate Repair Parts. a.   When National Stock Number or Part Number is Not Known’ (1) First Using the table of contents, determine the assembly group or subassembly group to which the Item belongs This is necessary since figures are prepared for assembly groups and subassembly groups, and listings are divided into the same groups. (2) Second Find the figure covering the assembly group or subassembly group to which the item belongs. (3) Third.   Identify the item on the figure and use the Figure and Item Number Index to find the NSN. b.   When National Stock Number or Part Number is Known. (1) First Using the National Stock Number or Part Number Index, find the pertinent National Stock Number or Part Number The NSN index is in National Item Identification Number (NIIN) sequence (see paragraph 4.a (1)) The part numbers in the Part Number index are listed in ascending alphanumeric sequence (see paragraph 4 b) Both indexes cross-reference you to the illustration/figure and Item number of the Item you are looking for. (2) Second item to the figure and Item number, verify that the item is the one you’re looking for, then locate the Item number in the repair parts list for the figure 7. Abbreviations. For standard abbreviations see MIL-STD-12D, Military Standard Abbreviations for Use on Drawings, Specifications, Standards, and in Technical Documents. Abbreviations Explanation NIIN .................. National Item Identification Number (consists of the last 9 digits of the NSN) RPSTL.............. Repair Parts and Special Tools List 5