Synopsis

The aircraft experienced violent rolling motion due to the partial separation of the inboard section of the starboard de-icing boot.  The partially separated portion of the de-icing boot flailed in the airflow impacting and damaging the starboard wing, flap and aileron, and causing significant handling challenges for the Pilot.  When the de-icing boot fully separated normal handling returned.  The separated portion of the de-icing boot was not recovered.