6.1.1 Where the rudder stock is required to be over 230 mm diameter in way of
the tiller, excluding strengthening for navigation in ice, an alternative power
supply, sufficient at least to supply the steering gear power unit, which complies
with the requirements of Pt 5, Ch 19, 2.1 General 2.1.3 and also its associated control
system and the rudder angle indicator, shall be provided automatically, within 45
seconds, either from the emergency source of electrical power, see also
Pt 6, Ch 2, 3.7 Alternative sources of emergency electrical power 3.7.9 or from an
independent source of power located in the steering gear compartment. This
independent source of power should only be used for this purpose.
6.1.2 In every unit 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 unit for at least 10 minutes.
6.1.3 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.