Investigators have not determined a cause, but ice has been mentioned as a possibility, as well as the crew's actions.
The family of crash victim Susan Wehle, of Amherst, N.Y., alleges negligence and is seeking unspecified damages. The suit names Continental Airlines, based in Houston; Pinnacle Airlines of Memphis, Tenn., and a subsidiary operating the flight, Colgan Air of Manassas, Va.; and Bombardier Aerospace, based in Montreal, which made the Dash 8 Q400 aircraft.
Pinnacle and Continental declined to comment on the lawsuit. Bombardier did not immediately respond to a request for comment Friday.
Colgan Air previously defended its training programs and the pilot after investigators said they would look into whether the crew overreacted to a sensor indicating the plane was slowing down dangerously.
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