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 TM 55-1905-223-24-18-1
(2) Bridge console panel. The bridge console panel provides controls for
main propulsion engines emergency stop, bowthruster/auxiliary fire pump engine start
and stop, exhaust and supply ventilator fans shutdown, fire pumps No. 1 and No. 2
start and stop, and dead man alarm illuminated pushbutton. Indicator lamps are
provided for port and starboard steering motor running, control station in
operation, bowthruster engine running, and fire pumps No. 1 or No. 2 running. The
panel also provides controls for operating the panel and CRT display.
e. Engine Order Telegraph (EOT) . The EOT communicates desired propeller shaft
speed and direction from the pilothouse console to the engine room console when the
bridge is not in direct control of the main engines. The system consists of drop-in
panels in both the ERC and PHC. The panels contain illuminated pushbuttons and
b e l l s . The bells ring at both locations. A two-wire data connection between the
panels is used to send and acknowledge orders taken or sent from either panel.
Direction is monitored in ahead, astern, and stop position. Wrong direction status
is visually and audibly alarmed at both stations. Each panel also alarms for order
and power failures.
(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
f l a s h . If both power supplies are available, the lamp will light steady. When a
u n i t 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 group. This group consists of ten port and
starboard commands (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 cancelled, and all audible
alarms are silenced. New orders can be changed or cancelled at the sending unit
prior to acknowledgement by pushing another order pushbutton. When the BRIDGE
CONTROL order is acknowledged, the AHD, STOP, and AST pushbutton lamps are turned
o f f . 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
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