A preliminary report from the US National Transportation Safety Board (NTSB) on July 9 found structural damage on Southwest Airlines flight 746 on a 737 MAX 8 aircraft that went into a ‘Dutch roll’ on May 25. A Dutch roll is an imbalance in both lateral and directional stability, which ultimately leads to a side-to-side rocking through a combination of rolling and yawing. The event occurred at around 34,000 feet after some light turbulence. The reported described the event as a “strange movement of the tail of the airplane back and forth, coupled with very slight rudder movement left and

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