Modifly

Not currently available in career. No indication when it might be. I've heard from other developers that only Marketplace aircraft can be made available in career, although this might change in the future.

This appears to be the correct behavior. From the How To - Taxi Management post: "Nosewheel steering is controlled by the rudder pedals, which in turn can deflect the nosewheel up to 15 degrees left or right by deflection of a bungee spring and cables. The nosewheel can further deflect up to 50 degrees by using differential braking. This is very different from airliners which have nosewheel steering up to 70 or more degrees. The pilot of the F406 will have to consider the following: The bungee spring assembly can only turn the nosewheel if the aircraft is moving and the rate at which it rotates depends on the speed. The slower the speed the longer it will take for the nosewheel to reach the commanded deflection. Start your turn early and use braking and/or differential braking if necessary. Differential power will also assist in turning, especially to achieve the smallest radius of turn." So you just have to be aware that you only have 15 degrees of nosewheel steering and the rest has to come from braking and thrust.

The checklist just says Avionics Bus Switches - AS REQUIRED. Nothing about the AVN AC switch. Less than helpful.

Also ensure that the AVN AC switch, located just ahead of the Avionics Bus switches, is set to either 1 or 2 (not the neutral center position that it starts in).