BBC NEWS | Americas | 'Ice build-up' on crashed plane
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The crew ... noticed "significant ice build-up" on its wings before it crashed, investigators say
"Analysis of data recorders recovered from the scene shows the plane made a series of severe pitches and rolls seconds before plunging into a house. ..."
...
"... aircraft's cockpit voice recorder captured the crew discussing landing the aircraft at Buffalo and noting snow and mist. At 16,000ft they said conditions were becoming hazy and asked for permission to descend to 12,000ft.
After that they were cleared to descend to 11,000ft.
The crew subsequently discussed "significant ice build-up" on the windshield and leading edge of the aircraft's wings, Mr Chealander said.
The official added that before these comments were made, the plane's de-icing system had been switched on.
'Severe pitches and rolls'
One minute before the end of the recording, the plane's landing gear was put down. Twenty seconds later the crew repositioned the aircraft's wing flaps to slow it for landing.
Within seconds of the flaps being moved, the aircraft experienced a "series of severe pitches and rolls", Mr Chealander said.
Just before the recording ended, the crew tried to raise the landing gear and reposition the flaps, he added.
Other pilots had reported ice forming on the wings of their planes...."