Control column vibration
In the descent recently we experienced vibration through the control column which was quite pronounced and lasted at least 2 or 3 mins. The aircraft was a kingair. We were doing about 180kts IAS and not in any icing conditions.
Was quite alarming while it lasted and I have no idea what could have caused it, we were not going very fast and had not picked up any ice during the flight at all.
Anybody have any ideas?