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 TM 55-1905-223-10
(1) Power group The power group consists of two illuminated pushbuttons: PWR ON/LAMP
.
TEST and COMM FAIL/SILENCE. The PWR ON/LAMP TEST pushbutton will apply power to that unit:- a
power failure of one of the two independent power supplies, fed from Wheel House DC Panel EP024-1, causes
the PWR ON/LAMP TEST to flash on and off and the audible alarm to sound. Pushing the pushbutton will
silence the alarm, and if one of the power supplies has failed, the PWR ON/LAMP TEST will continue to flash.
If both power supplies are available, the lamp will light steady. When a unit is first turned on, or power is
restored, the PWR ON/LAMP TEST lamp will flash and the audible alarms will activate. Pushing the
pushbutton will silence the alarms and cause the lamp to light steady. The unit then will update itself to the
other unit and display any detected faults by alarm or flashing lamps. Communication failure-between EOT
units will be alarmed by the flashing COMM FAIL/SILENCE illuminated pushbutton and audible alarms.
Pushing the pushbutton will silence the audible alarm, and the front panel will display various types of
communication failures by indicator lamps. Silencing an alarm within a unit group silences all alarms in that
group.
(2) Port and starboard telegraph groupThis group consists of ten port and starboard commands
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(orders): four ahead (AHD) orders, four astern (AST) orders, one BRIDGE CONTROL order, and one STOP
order. Completed orders are displayed as steadily illuminated pushbuttons and silenced audible alarms. A new
order can be placed by pushing another pushbutton which then flashes at both stations (pilothouse and engine
room consoles). At the same time, the internal horn sounds, and will continue to sound until the new order is
acknowledged. The new order is acknowledged at the receiver station by pushing the flashing pushbutton,
which then turns to the steady mode. The previous order is then canceled, and all audible alarms are silenced.
New orders can be changed or canceled at the sending unit prior to acknowledgment by pushing another order
pushbutton. When the BRIDGE CONTROL order is acknowledged, the AHD, STOP, and AST pushbutton
lamps are turned off. When bridge control is relinquished by placing and acknowledging another order, the
BRIDGE CONTROL lamp is turned off, thereby indicating engine room control.
(3) Wrong direction group This group consists of two indicating lamps (port and starboard
.
shafts) which alarm when a wrong direction condition exists. The wrong direction display and alarm is active
after an AHD, STOP, or AST order is acknowledged. If the order has been acknowledged and the shaft
direction does not 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 canceled. 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:
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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 canceled by a CANCEL STANDBY
order from the initiating EOT.
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