Special Information

TM 11-6625-298-24P

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

ponents

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

ZM-21A/U

firm, corporation, or Government activity), which

TM 11-6625-298-10P Ohmmeter ZM-21/U and

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

specifications,

1-48-B).

requirements to identify an item or range of items.

TM 11-6625-298-14 Ohmmeter ZM-21/U and

NOTE

Ohmmeter ZM-21A/U and Ohmmeter ZM-21B/U

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

unknown.

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.

same groups.

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.

the item.

(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

the item.

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

illustration.

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

known.

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.

publication are:

6. Abbreviations

code

Used on

Not applicable.

ATZ

ZM-21A/U

AIB

ZM-21B/U

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