What happened
On April 14, 1998, a Dornier 328-100 operating from Amsterdam to Dresden experienced a significant flight disturbance while climbing through FL 100. The aircraft was flying in icing conditions characterized by light sleet and temperatures between 0°C and -10°C.
During the climb, the crew noticed the airspeed had increased to 220 knots, exceeding the preset 200 knots. When the pilot disconnected the autopilot to manually reduce speed, the aircraft experienced a sudden, violent pitch-up movement. This abrupt change caused a service trolley in the rear of the cabin to strike the ceiling panel, resulting in light damage to the aircraft.
Shortly after, while continuing the climb to FL 170, the airspeed dropped below the preset value. The crew attempted to correct the pitch manually, but disconnecting the autopilot a second time triggered a strong pitch-down moment. Although no injuries occurred, the aircraft sustained minor internal damage. The crew continued the flight to the destination using manual controls.