The NTSB said the plane experienced what the crew said was a 'Dutch roll' at around 10,363 meters while en route from Phoenix to Oakland on May 25. Such lateral asymmetric movements are named after a Dutch ice skating technique, and can pose serious safety risks.
Boeing declined to comment on the incident, referring questions to Southwest, which said it is participating in the investigation. The Federal Aviation Administration (FAA), which said damage was seen in a standby power-control unit, said it is also investigating and working closely with the NTSB and Boeing.
Southwest confirmed a Bloomberg News report that it is investigating a Southwest 737 MAX 8 passenger flight in April that came within 122 meters of the ocean off the coast of Hawaii after weather conditions prompted pilots to bypass a landing attempt.
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