loads of time on type as well..when the nws steering had an electrical fault (flashing green light) iit was simple..turn the system off and free-castoring steering was available..the headaches begin when there are faults in the arming valve(hydraulic side of things..yellow light) and un commanded steering could occur..which required immediate press and hold of the nws button on the left power lever ( if the speed/rpm levers were off of the "low" position). In the hydraulic arming valve malfunction scenario, the pilot had no choice but to use the steering with arming valve faults, since the ability to remove hydraulic pressure from the system was lost..this was very well documented in appropriate manuals and procedures...I would suspect the crew experience/training levels of the crews may be a factor in many of these incidents, not implying it was the case in this incident referred to on this thread