Autopilot

Custom Search

FIGURE 1-35. Fire Monitor and Countermeasure Washdown Piping System - 02 Level.

TM-55-1905-223-10 Landing Craft Utility (LCU 200 Class) NSN 1905-01-154-1191 Manual

FM-200 Fixed Fire Suppression System

TM 55-1905-223-10

f. Oxygen Breathing Apparatus (OBA). The oxygen breathing apparatus provides oxygen to the wearer

for entering smoke filled compartments to fight fires. When activated, a chlorate candle within the apparatus

generates oxygen and supplies it to the breathing bag. Chemicals within the canister remove moisture and

carbon dioxide from the exhaled air and return the remainder of the air to the breathing bag. A pressure relief

valve vents excess pressure from the breathing bag.

g. Countermeasure Washdown The countermeasure washdown system (FIGURE 1-36) provides an

umbrella of seawater over the superstructure to counter nuclear, biological, and chemical (NBC) attack.

Seawater from the fire main is directed through washdown piping serving spray heads to wash down the

superstructure. Spray heads and piping are located around the main deck (FIGURE 1-37), 01 (FIGURE 1-38)

and 02 (FIGURE 1-35) levels. The system is activated by a valve in the engine room. Seawater for the system

is routed out of the machinery space via a riser to the 01 level and a riser from the 01 level to the 02 level.

Piping surrounding each level contains spray heads that disperse seawater. The system is activated from the

fire main fire monitor and countermeasure washdown gate valve, located in the machinery space.

1-26. Autopilot. The autopilot is an automatic steering control system that uses heading information from the

ship's gyrocompass to control the ship's steering gear. The autopilot energizes directional control valve

solenoids, part of the ship's steering gear, in order to maintain selected heading. The autopilot heading selector

combines the functions of a heading selector with a gyrocompass repeater. The heading selector contains

controls that permit the selection of operating mode and desired heading. The autopilot control amplifier

processes signals from the autopilot heading selector and the rudder repeatback unit to develop steering

signals that are sent to the steering gear solenoids. This provides rudder control. The autopilot rudder

repeatback unit sends signals from the steering gear, providing rudder position information, back to the

autopilot control amplifier.

1-27. Magnetic Compass. The magnetic compass provides heading information to the pilothouse using a

reflector compass mounted in a periscope binnacle. The binnacle is mounted on the pilothouse top with the

periscope assembly extending down through the pilothouse top deck into the pilothouse just forward of the

helm. A reflection of the compass card is projected through a series of lenses in the binnacle down to an

adjustable mirror in the periscope assembly. The compass can be read directly at the binnacle through a

viewing window or in the pilothouse via the mirror. A toggle switch and dimmer rheostat, located on the

binnacle, control power to a lamp located in the binnacle hood.

1-28. Navigation Lighting System. The navigation lighting system provides the appropriate exterior lights for

safe navigation. The system is controlled from the navigation lighting panel located in the aft area of the

pilothouse.

1-29. Sound Powered Telephone System The sound powered telephone system provides voice

communications throughout the ship. The system contains fixed phone stations and portable units. Since the

system is powered by voice only, it is functional even with the loss of all ship's power. There are three circuits,

JA, JV1, and JV2 within the sound powered telephone system.

1-104