Aircraft Icing Courses
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JANUARY 9, 1997
The aircraft was being vectored for an ILS approach to Detroit (DTW). The pilots slowed the aircraft to 150 knots while the aircraft leveled at 4,000 feet. While turning to the assigned heading the aircraft experienced an uncommanded roll and the autopilot disconnected.
Less than two seconds after the autopilot disconnected the flight data recorder indicated roll attitude increased from about 45 degrees left bank to about 140 degrees left bank and the pitch attitude decreased from nearly 2 degrees nose up to about 17 degrees nose down.
The control wheel position moved from about 18 degrees right to 19 degrees left. The aircraft struck the ground in a steep nose-down attitude about 19 nautical miles southwest of the airport.
Evidence indicates that the aircraft was picking up ice at a significant rate for less than a minute and the total accumulation was between 1/4 to 1/2 inch of ice.