Section 25(2)(b) in The Merchant Shipping (Cargo Ship Construction And Survey) Rules, 1974
(b)the main steering gear shall be capable of putting the rudder over from 35° on one side to 35° on the other side with the ship running ahead at maximum service speed. The rudder shall be capable of being put over from 35° on either side to 30° on the other side in 28 seconds at maximum service speed;