During the investigation, the NTSB found that prior to the June 9 incident, flight crews had reported a series of rudder-related events on the incident aircraft, including abnormal "bumps" on the rudder pedals and uncommanded movement of the rudder.
Durante a investigación a NTSB atopou que antes do incidente do 9 de xuño, varias tripulacións informaran dunha serie de eventos relacionados co timón, incluídos "golpes" anormais nos pedais do timón e movementos non ordenados do mesmo.