Accident Overview
The flight crew reported exiting clouds approximately 250 feet above ground level, slightly left of the runway centerline. The pilot not flying took control of the airplane and adjusted the course to the right. The airplane then rolled hard to the right, and when the pilot corrected to the left, it rolled hard to the left. The airplane impacted the ground in a right wing low attitude, resulting in substantial damage.
Sequence of Events
According to the flight crew, after exiting the clouds, the pilot not flying assumed control and initiated a right course correction. The airplane responded with a hard roll to the right. Subsequent corrective input to the left resulted in a hard roll to the left. Control was not regained, and the airplane struck the ground in a right-wing-low orientation.
System Examination
Further examination and testing revealed anomalies with the yaw damper and spoileron computer. However, according to the manufacturer, these anomalies would not have prevented control of the airplane. The manufacturer indicated that with an inoperative spoileron system, greater control wheel displacement and force would be required to achieve a desired roll rate. This would result in a slightly higher workload for the pilot, particularly in turbulence or crosswind conditions. An examination of the remaining systems revealed no anomalies.
Probable Cause
The probable cause, as determined by the official investigation, is the pilot's failure to maintain aircraft control during the landing.