5.4 Alarms
5.4.1 Alarm Management
5.4.1.1 Alarm Acknowledgement
A method of acknowledging all alarms (silence audible alarms and set visual alarms to steady state) should be provided at the navigating and maneuvering workstation, to avoid distraction by alarms which require attention but have no direct influence on the safe navigation of the ship and which do not require immediate action to restore or maintain the safe navigation of the ship.
5.4.1.2 Fire and Emergency Alarms
The alarm indicators and controls of the fire alarm and emergency alarm should be also integrated into the safety workstation.
5.4.1.3 Failure or Reduction of Power Supply
Alarms should be provided to indicate failure or reduction in the power supply which would effect the safe operation of the equipment.
5.4.1.4 Sensor Input Failure or Absence .
Alarms should be provided to indicate sensor input failure or absence.
5.4.1.5 Alarm Status
Alarm systems should clear]y distinguish between alarm, acknowledged alarm, and no alarm (normal condition).
5.4.1.6 Acknowledgment of Alarms
Alarms should be maintained until they are acknowledged.
5.4.1.7 Repeated Alarm Condition
If an alarm has been acknowledged and the incident occurs again before the first is rectified, the alarm should operate again.
5.4.1.8 Cancellation of Alarms
Alarms and acknowledged alarm should only be capable of being cancelled if the alarm condition is rectified.
5.4.1.9 Alarm Minimization
The number of alarms should be minimized.
5.4.1.10 Alarm Testing
Provision should be made for functionally testing alarms.
5.4.1.11 Power supply
Required alarm systems should be continuously powered and should have an automatic change-over to a stand-by power supply in case of loss of normal power supply.
5.4.1.12 Indication of Alarms
Alarms should be indicated in order of priority and provided with aids for decision-making. An explanation or justification of an alarm should be available (on request).
5.4.1.13 Presentation of Alarms
The presentation of alarms should be clear, distinctive, unambiguous, and consistent.
5.4.1.14 Modes of Alarms
All required alarms should be presented through both visual and auditory means.
