Nose wheel steering only controls the nose wheel up to 55 degrees of deflection. When steering is not engaged, the nose wheel can castor up to 99 degrees each side. If the nose wheel is deflected further when the “NOSE STEER” switch is set to ARM, it will not engage and the CAS will display an amber “STEERING INOP” message.
In order to recover nose wheel steering, the nose wheel must first be brought back within 55 degree deflection. This can be achieved by taxiing forward a bit. Steering can then be engage by cycling the NOSE STEER switch to the OFF position, then back into the ARM position.