Normally it blends inputs from rudder pedals and the two dedicated tillers to command nose-wheel deflections. The ratio is dependent on airspeed.
If ADR 3 might have an unreliability the system hasn't detected (which I think is what we're assuming), and you left it on, it seems like you could still end up with something like a large NWS deflection early in a cross-wind landing (because the ADR thought the airspeed was low when it wasn't).
This is not factual because it is ground speed and not airspeed.
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The BSCU transforms these orders into nose wheel steering angle. That angle has the following limits, which depend on ground speed and the origin of the orders.