6.1.1 The requirements of
Pt 5, Ch 19, 6.1 General apply to steering systems
with:
- A rudder-type steering system where the rudder stock is required to be over 230
mm diameter in way of the tiller, excluding strengthening for navigation in ice;
or
- Steerable podded propulsion units or steerable water jet systems
where the power per propulsion unit exceeds 2500 kW and the podded propulsion unit
or steerable water jet has a proven steering capability due to vessel velocity
even when propulsion power has failed.
6.1.2 An alternative power supply, sufficient at least to supply the steering
system which comply with the requirements of Pt 5, Ch 19, 2.2 Performance requirements for rudder-type steering systems 2.2.3 and also its associated control system and the
steering angle indicator, is to be provided automatically, within 45 seconds, either
from the emergency source of electrical power or from an independent source of power
located in the steering gear compartment. This independent source of power shall be used
only for this purpose.
6.1.3 In
every ship of 10 000 gross tonnage and upwards, the alternative power
supply shall have a capacity for at least 30 minutes of continuous
operation and in any other ship for at least 10 minutes.
6.1.4 Where
the alternative power source is a generator, or an engine driven pump,
starting arrangements are to comply with the requirements relating
to the starting arrangements of emergency generators.