2.1.1 The arrangement
of thrusters is to be such that the ship can be satisfactorily manoeuvred
with both thrusters simultaneously as well as with a single thruster
and is to be demonstrated during trials to an accepted trials programme.
2.1.2 For vessels
with multiple azimuthing thrusters, the requirement for auxiliary
steering arrangements in Pt 5, Ch 15, 2 Performance is
to be achieved by equipping each of the azimuthing thrusters with
its own dedicated and independent steering gear control system and
power actuating system. Consideration will be given to alternative
arrangements providing equivalence can be demonstrated.
2.1.3 In addition
to the requirements of Pt 5, Ch 15 Steering Systems,
the azimuthing mechanism is to be capable of a rotational speed of
not less than 1,5 rev/min.
2.1.4 The steering
arrangements are to be capable of changing the direction of the ship’s
directional control system from one side to the other at declared
steering angle limits at an average rotational speed of not less than
0,4 rev/min, with the ship running ahead at maximum ahead service
speed.