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 TM 55-1905-223-24-18-1
match the order (AHD-STOP-AST), the wrong direction alarm is activated (WRONG
DIRECTION lamp flashes and audible alarm sounds). The flashing WRONG DIRECTION
alarm lamp operates immediately but the audible alarm may be delayed to compensate
for changing of direction from AHD to AST or AST to AHD. When the correct direction
status is achieved, the wrong direction visual and audible alarms are cancelled. If
the direction of propulsion thrust changes from the acknowledged EOT direction, then
the wrong direction alarm is re-activated.
(4) Standby/finished with engines group. This group consists of three
illuminated pushbuttons: STANDBY, CANCEL STANDBY, and FINISHED WITH ENGINES.
Together, they function as a separate EOT group similar to the port and starboard
EOT groups.
(a) A STANDBY order may be placed independently of any other order.
(b) STANDBY, whether acknowledged or not, may be cancelled by a CANCEL
STANDBY order from the initiating EOT.
(c) A receiving EOT must acknowledge a STANDBY order before it can issue a
CANCEL STANDBY order.
(d) If the port and/or starboard EOT are active, a FINISHED WITH ENGINES
order may be initiated only if both port and starboard EOTs have acknowledged BRIDGE
CONTROL or STOP orders.
f . Steering Control Panel. The steering control panel is located on the
pilothouse console. The panel provides system power selection, mode of operation
including full followup (FFU) using the helm, non-followup (NFU) using pushbutton
switches on the panel, and AUTO (autopilot). The panel also contains an alarm panel
for each steering gear pumpset, alarm test switch, and cancel switch to silence the
alarm. Rudder position commands are input to the steering gear by movement of the
helm or pressing pushbutton switches. These input signals operate solenoid
activated hydraulic control valves in the pumpset selected. The control valves
direct the flow of hydraulic fluid from the pumpset to power cylinders attached to
the rudder tiller arms which position the rudder. The steering control panel
contains a rudder angle indicator that displays the actual rudder position in
degrees. A rudder order indicator below the panel displays a direct indication of
the actual position of the helm. The pumpset status panel includes two sets of six
indicators which give information on the status of each pumpset system. The green
status lamps (POWER AVAILABLE, MOTOR RUN) intensity is adjustable by a DIMMER
c o n t r o l . The remainder of the status lamps are activated-by alarm sensors and
remain on after the alarm horn has been cancelled, and until the fault is cleared.
The NFU pushbutton switches operate relays, which in turn operate the pumpset
solenoids until released. The rudder will then remain stationary to the position
commanded. When in FFU or AUTO mode, the NFU pushbuttons control the rudder to move
in the direction commanded as long as the pushbuttons are depressed. Upon releasing
a NFU pushbutton, steering control of the rudder will return to the control mode
selected. When in FFU, steering responds to the action of the helm. The rudder
will continue to move after the helm is moved to the desired position, until the
rudder matches the exact position of the helm as indicated by the rudder order
i n d i c a t o r . When in AUTO mode, the course set by the AUTOPILOT allows hands-off
steering of the vessel.
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