(4) Fourth. Refer to the Repair Parts List for the figure to find the part number for the item number
(5) Fifth. Refer to the Part Number Index to find the NSN, if assigned.
When National Stock Number or Part Number IS Known.
(1) First. Using the Index of National Stock Numbers and Part Numbers, find the pertinent National
Stock Number or Part Number. The NSN index is in National Item Identification Number (NIIN) sequence (see
c-4a.(1)). The part numbers in the Part Number index are listed in ascending alphanumeric sequence (see
paragraph c-4.b). Both indexes cross-reference you to the illustration figure and item number of the item you are
(2) Second. After finding the figure and item number, verify that the item is the one you are looking
for, then locate the item number in the repair parts list for the figure.
ABBREVIATIONS. Abbreviations used in this manual are listed in MIL-STD-12.