Aviation expert witnesses may testify aircraft accident investigation, aircraft design, aviation safety, flight training, and related matters. Today the National Transportation Safety Board released information on the investigation into the Asiana Airlines flight 214 accident on July 6, 2013. The NTSB investigation shows that the pilot inadvertently disabled a speed-control system.
NTSB Chairman Deborah A.P. Hersman took questions from the media during the investigative hearing. Her briefing may be found here: https://www.youtube.com/watch?v=I1GopE_siVY&feature=youtu.be in which she describes the timeline in the crash.