Incident Overview
Description
Veered off the runway during landing following a rudder control failure. The Finnish Accident Investigation Board classified this as a serious incident and launched an investigation. Probable cause and consequence The serious incident was caused by the mechanically centred rudder?s insufficient authority for directional control, which resulted in the aircraft veering off the runway. Contributing factors The rudder?s Travel Limitation Unit (TLU) electric actuator broke and the TLU was left in the high speed (HI SPD) mode for the approach and landing, jamming the rudder. Due to inadequate system awareness and the fact that the QRH did not clearly enough provide instructions for using the TLU?s standby system, the flight crew did not switch on the TLU?s standby system. The right engine?s propeller blade angles transitioned sooner into the BETA zone following the reduction of engine power at landing, which resulted in a large directional oscillation.
Source of Information
http://www.turvallisuustutkinta.fi/Etusivu/Ajankohtaista/1342537306217, http://www.turvallisuustutkinta.fi/en/Etusivu/Ajankohtaista/Valmistuneettutkinnattiedotteet/1368802952710http://www.turvallisuustutkinta.fi/Etusivu/Ajankohtaista/1342537306217, http://www.turvallisuustutkinta.fi/en/Etusivu/Ajankohtaista/Valmistuneettutkinnattiedotteet/1368802952710Primary Cause
Mechanically centred rudder?s insufficient authority for directional control, resulting in the aircraft veering off the runway.Mechanically centred rudder?s insufficient authority for directional control, resulting in the aircraft veering off the runway.Share on:
