Section 5 Communication and Alarm System

501. Communication

A reliable means of vocal communication is to be provided between the main machinery control station or the propulsion machinery control position as appropriate, the navigating bridge, the en- gineer officers’ accommodation and, on column-stabilized units, the central ballast control station.

502. Alarm system

1. An alarm system is to be provided in the main machinery control station giving audible and visual

indication of any fault requiring attention. It is also to:

(1) activate an audible and visual alarm at another normally manned control station;

(2) activate the engineers’ alarm provided in accordance with Ch 8, Sec 7 if an alarm function has not received attention locally within a limited time;

(3) as far as is practicable be designed on the fail-to-safety principle;and

(4) when in the marine mode, activate an audible and visual alarm on the navigating bridge for any

situation which requires action by the officer on watch or which should be brought to the atten- tion of the officer on watch.

2. The alarm system is to be continuously powered and is to have an automatic changeover to a stand-by power supply in case of loss of normal power supply.

3. Failure of the normal power supply of the alarm system is to be alarmed.

4. The alarm system is to be able to indicate at the same time more than one fault and the accept- ance of any alarm is not to inhibit another alarm.

5. Acceptance at the position mentioned in Par 1 of any alarm condition is to be indicated at the po- sitions where it has been shown. Alarms are to be maintained until they are accepted and the visu- al indications are to remain until the fault has been corrected, when the alarm system is to auto-

matically reset to the normal operating condition.