A350 uncommanded altitude deviations persist despite control unit update
#Airbus is investigating further uncommanded altitude changes on A350 twinjets despite modifications implemented after a similar situation emerged on the type two years ago.
#A350 crews had previously been given a revised altitude-selection procedure after investigations found that a failure of the altitude-selector dial – located on the flight control unit – could result in changes to the target altitude.
This target could change by 100ft or 1,000ft, depending on the interval setting, and lead to unexpected deviation from the intended vertical trajectory.
The European Union Aviation Safety Agency stated in 2021 that incidents of unwanted altitude changes by the auto-flight system had been traced to a manufacturing flaw on the altitude-selector knob’s encoder.
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