Yet another reason to have your seat belt buckled.
The incident caused significant structural damage and is raising further safety questions about the aircraft.
A Southwest spokesperson said it was participating in and supporting the investigation.
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They directed further questions to the NTSB.
The planemaker is also barred from increasing production above 38 planes-per-month until the regulator signs off.
What is a Dutch roll?
Dutch rolls can be resulting from things like wind or pilot commands, Boeing said in a 2022 post.
The movements are not necessarily uncommon in flight.
Acrobatic pilots sometimes perform them as part of their demonstrations at air shows, Adjekum said.
Pilots are trained to handle Dutch rolls and return a plane to normal flight.
He added that he has more questions than answers about the Southwest incident.
