b. The following publication pertains to the
MK-731/ARC-51X, MK-731A/ARC-51X and its
HReparable item. When uneconomically
reparable, condemn and dispose at the general
TM 11-6625-564-12, Maintenance Kits, Electronic
Equipment MK-731/ARC-51X and MK-731A/AR-
c. National Stock Number. Indicates the National
stock number assigned to the item and will be used
c. The illustrations in this manual are identical to
for requisitioning purposes.
those published in TM 11-6625-564-40P. Only
d Part Number. Indicates the primary number
those parts assigned the third position SMR main-
used by the manufacturer (individual, Company,
tenance code "C" or "O" are listed in the tabular
firm, corporation, or Government activity), which
listing therefore, there may be a break in the item
controls the design and characteristics of the item
number sequence. Only illustrations containing
by means of its engineering drawings,
organizational authorized items appear in this
specifications, standards, and inspection
requirements to identify an item or range of items.
5. HOW to Locate Repair Parts
a. When National stock number or part number is
When a stock numbered item is
requisitioned, the repair part received
(1) First. Using the table of contents, determine
may have a different part number than
the part being replaced.
the functional group within which the item belongs.
This is necessary since illustrations are prepared for
e. Federal Supply Code for Manufacturer (FSCM).
functional groups and listings are divided into the
The FSCM is a 5-digit numeric code listed in SB
708-42 which is used to identify the manufacturer,
(2) Second. Find the illustration covering the
distributor, or Government agency, etc.
functional group to which the item belongs.
f. Description. Indicates the Federal item name
(3) Third. Identify the item on the illustration
and, if required, a minimum description to identify
and note the illustration figure and item number of
g. Unit of Measure (U/M). Indicates the standard
(4) Fourth. Using the Repair Parts Listing, find
of the basic quantity of the listed item as used in
t h e figure and item number noted on the
performing the actual maintenance function. This
measure is expressed by a two-character
b. When National stock number or part number is
alphabetical abbreviation (e.g., ea. in, pr, etc). When
the unit of measure differs from the unit of issue, the
(1) First. Using the Index of National Stock
Iowest unit of issue that will satisfy the required
Numbers and Part Numbers, find the pertinent
units of measure will be requisitioned.
National stock number or part number. This index
h. Quuntity Incorporated in Unit. Indicates the
is in NIIN sequence foIlowed by a list of part num-
quantity of the item used in the breakout shown on
bers in alphameric sequence, cross-referenced to the
the illustration figure, which is prepared for a func-
illustration figure number and item number.
tional group, subfunctional group, or an assembly.
(2) Second. After finding the figure and item
4. Special Information
number, locate the figure and item number in the
a. Usable on codes are shown in the description
repair parts list.
column. Uncoded items are applicable to all models.
Identification of the usable on codes used in this
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