b. The illustrations in this manual are identical to
c. National Stock Number. Indicates the National
those published in TM 11-6660-219-34P. Only those
stock number assigned to the item and will be used for
parts assigned the third position SMR maintenance
code "C" or "O" are listed in the tabular listing, there-
d. Part Number. Indicates the primary number
fore, there may be a break in the item number se-
used by the manufacturer (individual, company, firm,
quence. Only illustrations containing organizational
corporation, or Government activity), which controls
authorized items appear in this manual.
the design and characteristics of the item by means of
its engineering drawings, specifications standards, and
inspection requirements, to identify an item or range of
5. How to Locate Repair Parts
a. When National stock number or part number is
When a stock numbered item is requisitioned,
(1) First. Using the table of contents, determine
the repair part received may have a different
the functional group within which the repair part be-
part number than the part being replaced.
longs. This is necessary since illustrations are prepared
e. Federal Supply Code for Manufaturer (FSCM).
for 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, distributor,
(2) Second. Find the illustration covering the
or Government agency, etc.
functional group to which the repair part belongs.
f. Description. Indicates the Federal item name
(3) Third. Identify the repair part on the illustra-
and, if required, a minimum description to identify the
tion and note the illustration figure and item number of
the repair part.
g. Unit of Measure (U/M). Indicates the standard of
(4) Fourth. Using the Repair Parts Listing, find
the basic quantity of the listed item as used in perform-
the figure and item number noted on the illustration.
ing the actual maintenance function. This measure is
b. When National stock number or part number is
expressed by a two-character alphabetical abbrevia-
tion (e.g., ea, in, pr, etc.). When the unit of measure
(1) First Using the Index of National Stock Num-
differs from the unit of issue, the lowest unit of issue
bers and Part Numbers, find the pertinent National
that will satisfy the required units of measure will be
stock number or part number. This index is in ascend-
ing NIIN sequence followed by a list of part numbers in
h. Quantity Incorporated in Unit. Indicates the
ascending alphameric sequence, cross-referenced to
quantity of the item used in the breakout shown on the
the illustration figure number and item number.
illustration figure, which is prepared for a functional
(2) Second. After finding the figure and item
group, subfunctional group, or an assembly.
number, locate the figure and item number in the re-
pair parts list.
4. Special Information
a. The following publication pertains to the AN/
GMM-1 and AN/GMM-lA and their components:
TM 11-6660-219-12, Radiosonde Baseline Check Sets
AN/GMM-l and AN/GMM-lA
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