2.1.1 Main and auxiliary steering gear for rudder-type steering systems are to
meet the performance requirements in Pt 5, Ch 19, 2.2 Performance requirements for rudder-type steering systems.
Steering performance on ships fitted with steerable podded propulsion systems is to
comply with Pt 5, Ch 9, 5.6 Steering system in addition to the
requirements of this Chapter, as applicable. Steering performance on ships fitted with
steerable water jet systems is to comply with Pt 5, Ch 16, 3.7 Nozzle/steering arrangements in addition to the
requirements of this Chapter, as applicable. Steering performance on ships fitted with
azimuth thruster systems is to comply with Pt 5, Ch 20, 2.1 General in addition to the requirements of this
Chapter, as applicable.
2.1.2 Unless the main steering arrangements for ship directional control comprise
two or more identical power units, in accordance with Pt 5, Ch 19, 2.1 General 2.1.4 or Pt 5, Ch 19, 8.1 For tankers, chemical tankers, or gas carriers of 10 000 tons gross and upwards and every other ship of
70 000 tons gross and upwards 8.1.1, every ship is to be provided with main steering
arrangements and auxiliary steering arrangements, or two or more identical steering
actuating systems, in accordance with the requirements of the Rules. The main and
auxiliary steering arrangements are to be so arranged that the failure of one of them
will not render the other one inoperative.
2.1.3 The main and auxilairy steering gear is to be:
-
Arranged to re-start
automatically when power is restored after power failure;
-
Capable of being
brought into operation from a position on the navigating bridge. In
the event of a power failure to any one of the steering gear power
units, an audible and visual alarm is to be given on the navigating
bridge;
-
Arranged so that
transfer between units can be readily effected.
2.1.4 Where
the steering arrangements are such that more than one power or control
system can be simultaneously operated, the risk of hydraulic locking
caused by a single failure is to be considered.
2.1.5 A means
of communication is to be provided between the navigating bridge and
the steering gear compartment.
2.1.6 Steering
gear, other than of the hydraulic type, will be accepted provided
the standards are considered equivalent to the requirements of this
Section.
2.1.7 Manually
operated gears are only acceptable when the operation does not require
an effort exceeding 16 kg under normal conditions.