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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
INTERNAL COMMUNICATION SYSTEMS
GENERAL
The Large Tug (LT) has three independent interior communication systems. The systems can be grouped into two types:
voice communication and non-voice communication. The voice communication system consists of the sound powered
telephone system and the intercommunication (intercom) system. The non-voice communications system consists of the
Engine Order Telegraph (EOT).
INTERCOMMUNICATION (INTERCOM) SYSTEM
The intercom system is a 20-station system that requires 120 Vac power. The 120 Vac power is provided from the pilothouse
emergency distribution panel. The intercom system is a party-line type voice communication system. When it is used, other
stations may join the discussion, but they cannot initiate a second discussion. Refer to table 1 for a list of intercom stations.
Table 1. Intercom Stations
Station Number
Location
1
PILOTHOUSE TOP
2
PILOTHOUSE
3
PORT BRDG WING
4
STBD BRDG WING
5
FWD 02 WEATHER DECK
6
AFT 02 WEATHER DECK
7
FORE DECK
8
CH ENG. S.R.
9
CAPTAIN'S S.R.
10
OFFICER S.R. 1
11
OFFICER S.R. 2
12
EMER GEN ROOM
13
AFT COUNT & GUNNER
14
D.C. LOCKER
15
CREW MESS
16
GALLEY
17
FANTAIL
0035 00-1
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