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TM 11-5895-555-24
CHAPTER 3
OPERATION
3-1. C-8157/ARC Controls and Indicators
Function
Control, Indicator or connecter
In up (on) position, connects power to control indicator
POWER ON switch CB-1 (two-position circuit breaker).
and associated TSEC/KY-28 Cipher equipment.
In down (off) position, disconnects power from control
indicator and associated TSEC/KY-28 Cipher equipment
Lights when POWER ON switch CB-1 is set to up (on
POWER ON (amber) indicator L1 (with dimmer switch).
position).
In PLAIN position, permits normal (enciphered)
PLAIN-CIPHER switch SW-1.
communications through associated Radio Set AN/ARC-
54 (or equivalent).
In CIPHER position, permits Ciphered communications
through associated Radio Set AN/ARC-54 (or
equivalent).
Lights when PLAIN-CIPHER switch SW-1 is set to the
PLAIN (red) indicator L2 (with dimmer switch).
PLAIN (Up) position.
Lights when PLAIN-CIPHER switch SW-1 is set to the
CIPHER (green) indicator L3 (with dimmer switch).
CIPHER (down) position.
In RE-X (up) position, permits retransmission of
RE-X/REG switch SW-2
Ciphered communications through associated
retransmission unit.
In REG (down) position, permits normal (unciphered)
or ciphered communications.
CAUTION. Do not place ZEROIZE switch SW-3 in the
top (on) position unless a crash or capture is imminent.
Normally in down (off) position. Placed in up (on) position
ZEROIZE switch SW-3 (under cover)
during emergency situations to neutralize and make
inoperative associated TSEC/KY-28 Cipher equipment.
Provide illumination for front panel of control indicator.
Panel lights L4 and L5.
Provides interconnection between control indicator, asso-
Connector J1.
ciated TSEC/KY-28 Cipher equipment and power
source.
Locks PLAIN-CIPHER switch in either plain or cipher
Locking Plate.
mode.
(2) Plain (enciphered) mode operation ( b
3-2. Operation
below)
When the Control Indicator and associated
(3) Cipher mode operation (c below)
TSEC/KY-28 Cipher equipments are installed
a. Preliminary 0perating Procedure.
in the aircraft or radio console, two methods of
(1) Apply power to AN/ARC-54 (or equiv-
radio communication are provided; PLAIN (un-
alent).
ciphered) and CIPHER. Procedures for operat-
(2) Set the Control Indicator C-8157/ARC
ing the equipment in the various modes are pro-
POWER ON switch (CB-1) to the up (ON) po-
vided as follows:
(1) Preliminary operating procedures ( a
(3) Assure POWER ON indicator lamp L1
below)
(amber is illuminated).
3-1

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