Regulation 20

For the purposes of this Part — “auxiliary means of activating the rudder” means the equipment which is provided for effecting movement of the rudder for the purpose of steering the ship in the event of failure of the main steering gear; “dead ship condition” means the condition under which the main propulsion plant and auxiliaries are not in operation due to the absence of power; “main steering gear” means the machinery, the steering gear power units, if any, and ancillary equipment and the means of applying torque to the rudder stock (e.g. tiller or quadrant) necessary for effecting movement of the rudder for the purpose of steering the ship under normal service conditions; “main switchboard” means a switchboard directly supplied by the main source of electrical power and intended to distribute electrical energy; “maximum ahead speed” means the greatest speed which the ship is designed to maintain in service at sea at its maximum permissible operating draught; “maximum astern speed” means the speed which it is estimated the ship can attain at the designed maximum astern power at its maximum permissible operating draught; “periodically unattended machinery spaces” means those spaces containing main propulsion and associated machinery and all sources of main electrical supply which are not at all times manned under all operating conditions, including manoeuvring; “steering gear power unit” means — ( a ) in the case of electric steering gear, an electric motor and its associated electrical equipment; ( b ) in the case of electro-hydraulic steering gear, an electric motor and its associated electrical equipment and connected pump; ( c ) in the case of other hydraulic steering gear, a driving engine and connected pump.