Serious incident with the aircraft SE-DSV at Gothenburg/Landvetter Airport

After take off from Gothenburg/Landvetter Airport the crew experienced strong vibration. When the autopilot was disconnected and the speed was reduced the vibrations ceased. The crew sent out a distress message and returned to Landvetter where a normal landing could be carried out. Upon inspection ice was discovered on the plane, despite the fact that de-icing had been ordered before take off.