Instruction manual

PROFICIENCY IN SURVIVAL CRAFT AND RESCUE BOATS OTHER THAN FAST
RESCUE BOATS
1-2
3
2.1.2 Emergency signals and public address system
The general emergency alarm system is capable of sounding the
general alarm signal consisting of seven or more short blasts followed by one long
blast on the vessel's whistle or siren and additionally on an electrically operated bell
or klaxon or other equivalent warning system which shall be powered by means of
two circuits, one from the ship's main supply and the other from the emergency
source of electrical power.
The general emergency alarm system is to be supplemented by either a public
address system or other suitable means of communication.
The entertainment sound system is to be automatically turned off when the
general alarm system is activated.
The system is to be continuously powered and is to have an automatic
change-over to a standby power supply in case of loss of the normal power supply.
An alarm is to be given in the event of failure of the normal power supply.
The system is to be capable of operation from the navigation bridge and,
except for the ship's whistle, also from other strategic points.
The alarm system is to be audible throughout all the accommodation and
normal crew working spaces and on all open decks.
The minimum sound pressure level for the emergency alarm tone in interior and
exterior spaces is to be 80 dB (A) and at least 10 dB (A) above ambient noise levels
existing during normal equipment operation with the ship underway in moderate
weather.
Every day the test of General emergency system and Public address system
must be done and the note must be inserted into the Log Book.
The public address system is to be one complete system consisting of a
loudspeaker installation which enables simultaneous broadcast of messages from
the navigation bridge, and at least one other location on board for use when the
navigation bridge has been rendered unavailable due to the emergency, to all
spaces where crew members or passengers, or both, are normally present
(accommodation and service spaces and control stations and open decks), and to
assembly stations (i.e. muster stations).
In spaces such as under deck passageways, busun's locker, hospital and pump
room, the public address system is/may not be required.
The public address system is to be arranged to operate on the main source of
electrical power, the emergency source of electrical power and transitional sources
of electrical power.
The controls of the system on the navigation bridge are to be capable of
interrupting any broadcast on the system from any other location on board.
The system is to be arranged to minimise the effect of a single failure so that
the emergency messages are still audible (above ambient noise levels) also in the
event of failure of any one circuit or component.
The combined General emergency alarm - Public address system: where the
public address system is the only means for sounding the general emergency alarm
signal and the fire alarm, the following are to be satisfied: