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Rudder
Rudder and pedal deflections are limited as a function of speed via a rudder travel limiter. The limits are shown on the F/CTL page. The RUD TRIM rotary switch is not active during flight with the autopilot engaged.
To test the rudder pedals, the PEDALS DISC button on the nose wheel steering handle must be pressed and held.
Yaw damper
A330 basic
In a total loss of electrical power or total loss of flight control computers the BYDU becomes active.
A330E
Yaw damping is a function of the flight control computers. After total electrical failure or loss of rudder control due to flight control computer failure, the BCM provides yaw damping.