b. The following publications pertain to the
c. National Stock Number. Indicates the National
ZM-21/U, ZM-21A/U, ZM-21B/U and its com-
stock number assigned to the item and will be used
for requisitioning purposes.
d. Part Number. Indicates the primary number
used by the manufacturer (individual, company,
TM 11-250 Test Set 1-48-B and Ohmmeter
firm, corporation, or Government activity), which
controls the design and characteristics of the item
ZM-21A/U (Includes Test Set 1-48-A and
by means of its engineering drawings,
standards, and inspection
requirements to identify an item or range of items.
TM 11-6625-298-14 Ohmmeter ZM-21/U and
When a stock numbered item is
5. How to Locate Repair Parts
requisitioned, the repair part received
a. When National stock number or part number is
may have a different pert number than
the part being replaced.
(1) First. Using the table of contents, determine
e. Federal Supply Code for Manufacturer (FSCM).
the functional group within which the item belongs.
The FSCM is a 5-digit numeric code listed in SB
This is necessary since illustrations are prepared for
708-42 which is used to identify the manufacturer,
functional groups and listings are divided into the
distributor, or Government agency, etc.
f. Description. Indicates the Federal item name
(2) Second. Find the illustration covering the
and, if required, a minimum description to identify
functional group to which the item belongs.
(3) Third. Identify the item on the illustration
g. Unit of Measure (U/M). Indicates the standard
and note the illustration figure and item number of
of the basic quantity of the listed item as used in
performing the actual maintenance function. This
(4) Fourth. Using the Repair Parts Listing, find
measure is e x p r e s s e d by a two-character
the figure and item number noted on the
alphabetical abbreviation (e.g., es, in, pr, etc). When
the unit of measure differs from the unit of issue, the
b. When National stock number or part number is
lowest unit of issue that will satisfy the required
units of measure will be requisitioned.
(1) First. Using the Index of National Stock
h. Quantity Incorporated in Unit. Indicates the
Numbers and Part Numbers, find the pertinent
quantity of the item used in the breakout shown on
National stock number or part number. This index
the illustration figure, which is prepared for a func-
is in NIIN sequence followed by a list of part num-
tional group, subfunctional group, or an assembly.
bers in alphameric sequence, cross-referenced to the
4. Special Information
illustration figure number and item number.
a. Usable on males are shown in the description
(2) Second. After finding the figure and item
number, locate the figure and item number in the
column. Uncoded items are applicable to all models.
Identification of the usable on codes used in this
repair parts list.
(Next printed page is 4)