11.4.1 Alarm systems should be provided which
announce at the craft's control position, by visual and audible means,
malfunctions or unsafe conditions. Alarms should be maintained until
they are accepted and the visual indications of individual alarms
should remain until the fault has been corrected, when the alarm should
automatically reset to the normal operating condition. If an alarm
has been accepted and a second fault occurs before the first is rectified,
the audible and visual alarms should operate again. Alarm systems
should incorporate a test facility.
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11.4.1.1 Alarms giving indication of conditions
requiring immediate action should be distinctive and in full view
of crew members in the operating compartment, and should be provided
for the following:
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.1 activation of a fire detection system;
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.2 total loss of normal electrical supply;
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.3 overspeed of main engines;
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.4 thermal runaway of any permanently installed
nickel-cadmium battery.
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11.4.1.2 Alarms with a visual display distinct
from that of alarms referred to in 11.4.1.1 should indicate conditions
requiring action to prevent degradation to an unsafe condition. These
should be provided for at least the following:
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.1 exceeding the limiting value of any craft,
machinery or system parameter other than engine overspeed;
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.2 failure of normal power supply to powered directional
or trim control devices;
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.3 operation of any automatic bilge pump;
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.4 failure of compass system;
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.5 low level of a fuel tank contents;
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.6 fuel oil tank overflow;
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.7 extinction of side, masthead or stern navigation
lights;
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.8 low level of contents of any fluid reservoir
the contents of which are essential for normal craft operation;
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.9 failure of any connected electrical power source;
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.10 failure of any ventilation fan installed for
ventilating spaces in which inflammable vapours may accumulate;
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.11 diesel engine fuel line failure as required
by 9.4.2.
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11.4.1.3 All warnings required by 11.4.1.1 and
11.4.1.2 should be provided at all stations at which control functions
may be exercised.
11.4.2 The alarm system should meet appropriate
constructional and operational requirements for required alarmsfootnote.
11.4.3 Equipment monitoring the passenger, cargo
and machinery spaces for fire and flooding should, so far as is practicable,
form an integrated sub-centre incorporating monitoring and activation
controls for all emergency situations. This sub-centre may require
feed-back instrumentation to indicate that actions initiated have
been fully implemented.