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Section I: INTRODUCTION
Up
TM-11-5815-334-20P Radio Teletypewriter Sets AN/GRC - 122 AN/GRC ¬ 122A AN/GRC-122B AN/GRC-142 AN/GRC¬142A and AN/GRC¬142B Manual
Next
How to Locate Repair Parts
TM 11-5815-334-20P
the item to be assembled.
Recoverability
c. The following publications pertain to the AN/-
Definition
codes
H --Reparable item. When uneconomically reparable,
GRC-122, AN/GRC-122A, AN/GRC-122B, AN/-
condemn and dispose at the general support
GRC-122C,  AN/GRC-142,  AN/GRC-142A,  AN/-
level.
GRC-142B and AN/GRC-142C and its components
D --Reparable item. When beyond lower level repair
TM 5-4520-236-14, Heater, Space, Portable: Air Circu-
capability, return to depot. Condemnation and
lating Type: Gasoline; 15,000 BTU/hr; Electric Motor
disposal not authorized below depot level.
Driven Blower (Hunter Manufacturing Company
L  --Reparable item. Repair, condemnation, and dis-
Model UH48B Type, III)
posal not authorized below depot/secialized
TM 5-4520-236-24P, Heater, Space, Portable: Air Circu-
repair activity level.
lating Type: Gasoline, 15,000 BTU/hr; Electric Motor
c. National Stock Number. Indicates the National stock
Driven Blower (Hunter Manufacturing Company
number assigned to the item and will be used for req-
Model UH48B, Type III)
uisitioning purposes.
TM 11-5038, Control Group AN/GRA-6
d. Part Number. Indicates the primary number used by
TM 11-5410-212-15P, Shelter, Electrical Equipment
the manufacturer (individual, company, firm, corpora-
5-318/G
tion, or Government activity), which controls the design
TM 11-5805-201-12, Telephone Set TA-312/PT
and characteristics of the item by means of its engineering
TM 11-5805-201-20P, Telephone Set TA-312/PT
drawings, specifications, standards, and inspection re-
TM 11-5805-387-15-1, Modem, Radio Teletypewriter
quirements to identify an item or range of items.
MD-522/GRC
NOTE
TM 11-5805-387-15-2, Radio Teletypewriter Modem
When a stock numbered item is requisitioned,
MD-522A/GRC
the repair part received may have a different part
TM 11-5805-387-20P-2, Modem, Radio Teletypewriter
number than the part being replaced.
MD-522/GRC
e. Federal Supply Code for Manufacturer (FSCM).
TM 11-5805-387-20P-2, Modem, Radio Teletypewriter
The FSCM is a 5-digit numeric code listed in SB 708-41/-
MD-522A/GRC
42 which is used to identify the manufacturer, distributor,
TM 11-5805-387-24P-1, Modem, Radio Teletypewriter
or Government agency, etc.
MD-522/GRC
f. Description. Indicates the Federal item name and, if
TM 11-5815-200-12, Teletypewriter Sets AN/FGC-20,
required, a minimum description to identify the item.
AN/FGC-20X, AN/FGC-21 , AN/FGC-64, AN/-
g. Unit of Measure (U/M). Indicates the standard of
FGC-66, AN/FGC-67, AN/FGC-67X, AN/UGC-4,
the basic quantity of the listed item as used in performing
AN/UGC-29, AN/UGC-29X, and Teleprinter
the actual maintenance function. This measure is ex-
TT-259/FG
pressed by a two-character alphabetical abbreviation (e.g.;
TM 11-5815-238-12, Teletypewriter Sets AN/GGC-3
ea, in, pr, etc). When the unit of measure differs from the
and AN/GGC-3A and Teletypewriter Reperforator-
unit of issue, the lowest unit of issue that will satisfy the
Transmitters TT-76/GGC, TT-76A/GGC, TT-76B/-
required units of measure will be requisitioned,
GGC, and TT-76C/GGC
TM 11-5815-238-20P, Teletypewriter Sets AN/GGC-3
h. Quantity Incorporated in Unit. Indicates the quantity
of the item used in the breakout shown on the illustration
and AN/GGC-3A and Teletypewriter Reperforator-
figure, which is prepared for a functional group, subfunc-
Transmitters TT-76/GGC, TT-76A/GGC, TT-76B/-
tional group, or an assembly.
GGC, and TT-76C/GGC
TM 11-5815-334-12, Radio Teletypewriter Sets AN/-
4. Special Information
GRC-142, AN/GRC-142A, AN/GRC-142B, AN/-
a. Usable on code reference to the Plain, A, and B
GRC-122, AN/GRC-122A, and AN/GRC-122B
models of the AN/GRC-142(*) are applicable to the
TM 11-5815-338-15, Device, Low Level Signaling
respective models of the AN/GRC-122(*). All references
TT-523/GGC and TT-523A/GGC
to "duplex operation" refer to the AN/GRC-122(*).
TM 11-5815-602-12, Terminal, Communications AN/-
Identification of the usable on codes used in this publica-
UGC-74A(V)3
tion are:
TM 11-5815-602-20P, Terminal, Communications
Code
Used on
AN/UGC-74A(V)3
3G5
AN/GRC-142
TM 11-5820-467-15, Antenna Group AN/GRA-50
AJY
AN/GRC-142A
TM 11-5820-467-25P, Antenna Group AN/GRA-50
3G7
AN/GRC-142B
TM 11-5820-489-20P, Control Group AN/GRA-6
EHH AND 3G5
AN/GRC-142C
TM 11-5820-520-12, Radio Sets AN/GRC-106 and
b. Detailed assembly instructions for items source
AN/GRC-106A
coded to be assembled are found in TM 11-5815-334-12.
Assembly components are listed immediately following
TM 11-5820-520-20P-1, Radio Set AN/GRC-106
2
Change 1

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