| -
|
Automatic (Automatically brought into operation whenever the ships
heading or track control system is activated and inhibited when this
system is not activated)
|
| -
|
Manual ON
|
(In operation
constantly)
|
| -
|
Manual
OFF
|
(Does
not operate under any circumstances)
|
4.1.2 Operational sequence of indications and
alarms
4.1.2.1 Once operational, the alarm system should
remain dormant for a period of between 3 and 12 min (Td).
4.1.2.2 At the end of this dormant period, the
alarm system should initiate a visual indication on the bridge.
4.1.2.3 If not reset, the BNWAS should additionally
sound a first stage audible alarm on the bridge 15 s after the visual
indication is initiated.
4.1.2.4 If not reset, the BNWAS should additionally
sound a second stage remote audible alarm in the back-up officer's
and/or Master's location 15 s after the first stage audible alarm
is initiated.
4.1.2.5 If not reset, the BNWAS should additionally
sound a third stage remote audible alarm at the locations of further
crew members capable of taking corrective actions 90 s after the second
stage remote audible alarm is initiated.
4.1.2.6 In vessels other than passenger vessels,
the second or third stage remote audible alarms may sound in all the
above locations at the same time. If the second stage audible alarm
is sounded in this way, the third stage alarm may be omitted.
4.1.2.7 In larger vessels, the delay between the
second and third stage alarms may be set to a longer value on installation,
up to a maximum of 3 min, to allow sufficient time for the back-up
officer and/or Master to reach the bridge.
4.1.3.1 It should not be possible to initiate
the reset function or cancel any audible alarm from any device, equipment
or system not physically located in areas of the bridge providing
proper look out.
4.1.3.2 The reset function should, by a single
operator action, cancel the visual indication and all audible alarms
and initiate a further dormant period. If the reset function is activated
before the end of the dormant period, the period should be re-initiated
to run for its full duration from the time of the reset.
4.1.3.3 To initiate the reset function, an input
representing a single operator action by the OOW is required. This
input may be generated by reset devices forming an integral part of
the BNWAS or by external inputs from other equipment capable of registering
physical activity and mental alertness of the OOW.
4.1.3.4 A continuous activation of any reset device
should not prolong the dormant period or cause a suppression of the
sequence of indications and alarms.
4.1.4 Emergency call facility Means may be provided
on the bridge to immediately activate the second, and subsequently
third, stage remote audible alarms by means of an “Emergency
Call” push button or similar.
Means may be provided on the bridge to immediately activate
the second, and subsequently third, stage remote audible alarms by
means of an “Emergency Call” push button or similar.