CHAPTER 3 OPERATION - TM-11-5895-555-240015

TM 11-5895-555-24

CHAPTER 3

OPERATION

3-1. C-8157/ARC Controls and Indicators

(fig. 1-1 and 1-2)

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:

sition (fig. 1-1, 1-2).

(1) Preliminary operating procedures ( a

(3) Assure POWER ON indicator lamp L1

below)

(amber is illuminated).

3-1