NAVELEX EE 181-AA-OMI-110/E121 C-9412
PARTNUMBER INDEX. Part numbers in this index are listed by part number in ascending alphanumeric
sequence (i.e., vertical arrangement of letter and number combination which places the first letter or digit of each group in
order A through Z, followed by the numbers 0 through 9 and each following letter or digit in like order).
FSCM column. The Federal Supply Code for Manufacturer (FSCM) is a 5-digit numeric code used to
identify the manufacturer, distributor, or Government agency, etc., that supplies the item.
PART NUMBER column. Indicates the primary number used by the manufacturer (individual, firm,
corporation, or Government activity), which controls the design and characteristics of the item by means
of its engineering drawings, specifications standards, and inspection requirements to identify an item or
range of items.
STOCK NUMBER column. This column lists the NSN for the associated part number and
manufacturer identified in the PART NUMBER and FSCM columns to the left.
FIG. column. This column lists the number of the figure where the item is identified/located in Sections
II and III.
ITEM column. The item number is that number assigned to the item as it appears in the figure
referenced in adjacent figure number column.
SPECIAL INFORMATION. The usable on code appears in the lower left corner of the Description column
heading. Usable on codes are shown as "UOC: "in the Description Column (justified left) on the first line applicable item
description/nomenclature. Uncoded items are applicable to all models.
HOW TO LOCATE REPAIR PARTS.
When National Stock Number or Part Number is NOT Known.
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.
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 note the item number.
Fourth. Refer to the Repair Parts List for the figure to find the part number for the item number noted
on the figure.
Fifth. Refer to the Part Number Index to find the NSN, if assigned.
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
4a(1)). The part numbers in the Part Number index are listed in ascending alphanumeric sequence
(see paragraph 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 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.
Change 1 C-6