b. The following publications pertain to the CU-
drawings, specifications, standards, and inspection
requirements to identify an item or range of items.
1658/A, CU-1658A/A, CU-1669/GRC, and MT-3785/A
and their components.
TM 11-5985-326-20, Coupler, Antenna CU-1658/A and
When a stock numbered item is
requisitioned, the repair part received
TM 11-5985-326-35, Coupler, Antenna CU-1658/A and
may have a different part number
than the part being replaced.
5. How to Locate Repair Parts
e. Federal Supply Code for Manufacturer (FSCM).
a. When National stock number or part number is
The FSCM is a 5-digit numeric code listed in SB 708-42
which is used to identify the manufacturer, distributor, or
Using the table of contents,
Government agency, etc.
determine the functional group within which the item
Description. Indicates the Federal item name
This is necessary since illustrations are
and, if required, a minimum description to identify the
prepared for functional groups and listings are divided
into the same groups.
g. Unit of Measure (U/M). Indicates the standard of
(2) Second. Find the illustration covering the
the basic quantity of the listed item as used in performing
functional group to which the item belongs.
the actual maintenance function. This measure is
(3) Third. Identify the item on the illustration
expressed by a two-character alphabetical abbreviation
and note the illustration figure and item number of the
(e.g, ea, in, pr, etc). When the unit of measure differs
from the unit of issue, the lowest unit of issue that will
(4) Fourth. Using the Repair Parts Listing, find
satisfy the required units of measure will be
the figure and item number noted on the illustration.
b. When National stock number or part number is
h. Quantity Incorporated in Unit. Indicates the
quantity of the item used in the breakout shown on the
(1) First. Using the Index of National Stock
illustration figure, which is prepared for a functional
Numbers and Part Numbers, find the pertinent National
group, subfunctional group, or an assembly.
stock number or part number. This index is in NIN
4. Special Information
sequence followed by a list of part numbers in
a. Usable on codes are shown in the description
alphanumeric sequence, cross-referenced to the
column. Uncoded items are applicable to all models.
illustration figure number and item number.
Identification of the usable on codes used in this
(2) Second. After finding the figure and item
number, locate the figure and item number in the repair
(Next printed page is 4)