b. When National Stock Number or Part Number is Known:
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 F-4a(1)). The part numbers in the PART NUMBER INDEX are listed in ascending alphanumeric
sequence (see F-4b). Both indexes cross-reference you to the illustration figure and item number of the item you are looking for.
Second. After finding 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.
ABBREVIATIONS. Not applicable.