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 TM 55-1905-223-10
i. Bow Ramp Control. The bow ramp control system consists of three bow ramp control panels:
pilothouse console, boatswain storeroom (bow ramp winch), and starboard forecastle deck. Controls are
provided for turning the winch electric motor off and on (PHC and boatswain storeroom only) and raising and
lowering the ramp. Pushbuttons are provided for starting and stopping the winch hydraulic pump and taking up
tension (slack) on the wire rope. Indicator lamps provide visual display of hydraulic oil temperature,(above
150 ), tension (slack wire rope), and hydraulic pump running.
F
j. Dead Man Alarm. The dead man alarm system is incorporated in the machinery plant monitoring
engine room console panel and bridge console panel. The bridge console panel contains an illuminated
pushbutton that when depressed causes the corresponding illuminated pushbutton and audible horn on the
engine room console panel to be activated. If the engine room attendant does not acknowledge the dead man
activation by the bridge within a specified time, alarms will sound, signifying the engine room attendant cannot
acknowledge. If the engine room attendant answers the dead man alarm within the specified time, both
illuminated pushbuttons will extinguish and horn will be silenced.
k. Engineer's Assistance Needed The engineer's assistance needed system is incorporated in the-
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machinery plant monitoring engine room console panel. The assistance needed system notifies off watch
engineers that the ERC attendant needs assistance. The system is activated when the ENGINEER
ASSISTANCE NEEDED illuminated pushbutton on the ERC is pushed. This action causes an audible alarm
and flashing lamp to be activated at remote panels in the mess room and the chief engineer's stateroom.
Pressing the illuminated pushbutton on one of the remote panels will acknowledge the assistance needed
request. The system will also be activated by the dead man alarm system if the ERC attendant does not
acknowledge the dead man alarm in the specified time limit.
detected via temperature rate-of-heat rise detectors located throughout the LCU. The system consists of the
fire control panel located in the pilothouse, a terminal box, heat rise detectors (thermostats) located in various
compartments, manual pull stations, and a 10-inch bell. The heat detectors are arranged in six zones
throughout the vessel. When a fire condition is detected, the associated thermostat sends an alarm signal, via
a zone module located in the fire control panel to the fire control panel indicators. When pulled, the manual fire
pull box also sends an alarm signal via the zone module to the marine fire detector panel indicators.
1-15. Steering Gear System. The steering gear system is an electrically driven, hydraulically operated
system (FIGURE 1-34) that positions the rudders in response to steering commands. Rudder position
commands are input to the steering gear by the movement of the ship's helm (wheel) to generate an electrical
signal. The signal operates solenoid activated hydraulic control valves in the hydraulic power unit. The control
valves direct the flow of hydraulic fluid from the hydraulic pump to power cylinders attached to the rudder tiller
arms which position the rudder. The hydraulic system consists of redundant electrical-hydraulic power units.
Either unit can be selected from the pilothouse console steering control panel. If electric power is lost, a hand
pump provides a backup steering system. The hand pump is a manually operated, reversible, positive
displacement rotary pump used for emergency steering.
1-95
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