In the centre stick design, like traditional airplane yokes, both the pilot's and co-pilot's controls are mechanically connected together so each pilot has a sense of the control inputs of the other. In typical Airbus side-stick implementations, the sticks are independent, the so-called 'passive' side-stick. The plane's computer either aggregates multiple inputs or a pilot can press a "priority button" to lock out inputs from the other side-stick. However, if both side-sticks are moved in different directions (regardless of which pilot has priority), then both inputs are cancelled out and an aural "dual input" warning sounds. Examples of this occurring include the 2009 crash of Air France Flight 447 (an Airbus A330 flying from Rio de Janeiro to Paris), the 2010 crash of Afriqiyah Airways Flight 771 an Airbus A330 from flying Johannesburg to TripoliPage 81 "Conclusions" Final Report of AFRIQIYAH Airways Aircraft, Airbus A330-202, 5A-ONG Crash, Occurred at Tripoli (LIBYA)on 12/05/2010 Published February 2013. and the 2014 crash of Indonesia AirAsia Flight 8501 (an Airbus A320 flying from Surabaya to Singapore). The "dual input" warning will not activate at very low levels if the EGPWS activates due to its lower priority compared to EGPWS. BEA's Comments on Final Report of Armavia flight 967 an A320 crash near Sochi Airport  3 May 2006, page 48, Published 12 February 2007
In the centre stick design, like traditional airplane yokes, both the pilot's and co-pilot's controls are mechanically connected together so each pilot has a sense of the control inputs of the other. In typical Airbus side-stick implementations, the sticks are independent, the so-called 'passive' side-stick. The plane's computer either aggregates multiple inputs or a pilot can press a "priority button" to lock out inputs from the other side-stick. However, if both side-sticks are moved in different directions (regardless of which pilot has priority), then both inputs are cancelled out and an aural "dual input" warning sounds. Examples of this occurring include the 2009 crash of Air France Flight 447 (an Airbus A330 flying from Rio de Janeiro to Paris), the 2010 crash of Afriqiyah Airways Flight 771 an Airbus A330 from flying Johannesburg to TripoliPage 81 "Conclusions" Final Report of AFRIQIYAH Airways Aircraft, Airbus A330-202, 5A-ONG Crash, Occurred at Tripoli (LIBYA)on 12/05/2010 Published February 2013. and the 2014 crash of Indonesia AirAsia Flight 8501 (an Airbus A320 flying from Surabaya to Singapore). The "dual input" warning will not activate at very low levels if the EGPWS activates due to its lower priority compared to EGPWS. Final Report on the investigation into the accident involving the Armavia A320 near Sochi Airport on 3 May 2006, page 48, Published 12 February 2007
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BEA's Comments on Final Report of Armavia flight 967 an
Final Report on the investigation into the accident involving the Armavia
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crash
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on