Originally Posted by
Tom Sawyer
From an Engineering point of view, the answer is as the MEL quoted above. It comes down to it being one system, which includes both tillers. If any part of the control system is not functioning correctly, the whole system is classed as inop, so a no-go. If it was allowable to have one tiller inop, it would be in the MEL as a separate item.
Ok. That sounds logical. Both Tillers could be considered as part of one system-which is NWS system. So, if one tiller is inoperative, it effects the NWS system as well. Since NWS system is a required system, it becomes a NO-GO.