reference number listed more than once, with each
listing having a different NIIN. For proper
identification, you must then select the NIIN from the
line entry showing the FSCM for the company that made
the needed part.
The identification lists of the Federal Supply
Catalog include the FSCM in the item descriptions. The
introduction to each section includes a numerical listing
of all FSCMs included in that section.
IDENTIFICATION TO A CURRENT NSN
To obtain required material, you must first find its
current NSN. There are three basic methods of entry you
may use with the catalogs to obtain this information:
Entry with an NSN (which may or may not be
Entry with a reference number (manufacturers
part number, Navy drawing number, or other
Entry with a noun name and or physical
actual practice, if you already have the NSN, you
just submit the completed requisition to the supply
Entry With Parrt, Drawing, or Piece Number
A reference number is generally any number, other
than a current NSN, that can be used to identify an item
or to aid in determining the current NSN. Reference
numbers, therefore, include old FSNs, electron tube
numbers, and electronic equipment circuit symbol
numbers. There are, however, two additional important
types of reference numbers that you can convert to
national stock numbers by using the C-MCRL. They are
(1) manufacturers part numbers and (2) Navy drawing
and piece numbers.
Manufacturers part numbers are numbers assigned
to parts by the manufacturer who designs and builds the
equipment. The manufacturers assign the numbers for
their own use in cataloging and identifying their own
material. Some manufacturers use part number systems
in which their plan or drawing and piece numbers form
all or a portion of their part numbers.
Navy drawing and piece numbers were assigned
originally by Navy technical commands to identify
items in equipment built and or designed by those
commands. Some items may have both manufacturers
part numbers and Navy drawing and piece numbers
listed in various reference publications.
When you first try to determine an items current
NSN, you will probably look for a manufacturers part
number or a Navy drawing and piece number. There are
several possible places to look for such numbers:
On an Allowance Parts List (APL).
On the part to be replaced. The part number may
be stamped on it.
In equipment technical manuals. hey may refer
to a manufacturers part number or Navy
drawing and piece numbers.
On equipment plans. Plans available on the ship
may contain Navy drawing and piece numbers.
In EIMB reference data.
Technical manuals, furnished by the manufacturer,
contain a detailed description of equipment and
instructions for its effective use. Normally, the supply
officer does not have technical manuals; they are
maintained and used by the ships technicians in
maintaining the complex equipment installed in the
ship. They can serve as a basic source of identification
information for repair parts.
To obtain a current NSN when you know a reference
number, enter the C-MCRL to determine the NIIN.
When the NIIN is listed, check to ensure that the FSCM
coincides with that of the manufacturer of the part.
When the number is listed more than once, you will
need to obtain the manufacturers code. When you
obtain the correct NIIN, update your records to reflect
the current stock number.
Entry with Noun Name and or
The third method of obtaining a current NSN
involves beginning the search with a physical
characteristic or noun name description of the item.
There are two different methods of describing an
item other than by the NSN. The first method uses a
physical description of the item and perhaps a
description of its electrical, chemical, and other
properties. (This type of description is similar to that
provided in mail order catalogs.) The second method,
which we covered previously, uses only a reference
number; that is, manufacturers part number. Most of the