During pre-departure maintenance activity to resolve a flight control status message, the No 1 spoiler was unintentionally left in the MAINTENANCE position with the maintenance key installed. During the flight, the spoiler was able to ‘float’ up resulting in uncommanded left roll and vibration. The crew landed the aircraft without further incident.
The operator’s internal investigation identified a number of factors which contributed to the maintenance error and it made 11 internal recommendations.
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