4. Special Information
The following publication pertains to the MD-522A/GRC
repair activity level.
Modem and its components:
c. National Stock Number. Indicates the National stock
TM11-5805-387-15-2, Radio Teletypewriter Modem,
number assigned to the item and will be used for requisi-
d. Part number. Indicates the primary number used by
5. How to Locate Repair Parts
the manufacturer (individual, company, firm, corpora-
a. When National stock number or part number is
tion, or Government activity), which controls the design
(1) First. Using the table of contents, determine the
and characteristics of the item by means of its engineering
functional group within which the item belongs. This is
drawings, specifications, standards, and inspection re-
necessary since illustrations are prepared for functional
quirements to identify an item or range of items.
groups and listings are divided into the same groups.
(2) Second. Find the illustration covering the func-
When a stock numbered item is requisitioned,
tional group to which the item belongs.
the repair part received may have a different part
(3) Third. Identify the item on the illustration and
number than the part being replaced.
note the illustration figure and item number of the item.
e. Federal Supply Code for Manufacturer (FSCM).
(4) Fourth. Using the Repair Parts Listing, find the
The FSCM is a 5-digit numeric code listed in SB 708-42
figure and item number noted on the illustration.
which is used to identify the manufacturer, distributor, or
b. When National stock number or part number is
Government agency, etc.
f. Description. Indicates the Federal item name and, if
(1) First. Using the Index of National Stock Num-
required, a minimum description to identify the item.
bers and Part Numbers, find the pertinent National stock
g. Unit of Measure (U/M). Indicates the standard of
number or part number. This index is in NIIN sequence
the basic quantity of the listed item as used in performing
followed by a list of part numbers in alphameric sequence,
the actual maintenance function. This measure is ex-
cross-referenced to the illustration figure number and
pressed by a two-character alphabetical abbreviation (e.g.,
ea, in, pr, etc). When the unit of measure differs from the
(2) Second. After finding the figure and item num-
unit of issue, the lowest unit of issue that will satisfy the
ber, locate the figure and item number in the repair parts
required units of measure will be requisitioned.
h. Quantity Incorporated in Unit. Indicates the quantity
of the item used in the breakout shown on the illustration
figure, which is prepared for a functional group, subfunc-
tional group, or an assembly.
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