Southwest Airlines Boeing 737 Max goes into "Dutch roll" during Phoenix-to-Oakland flight

Federal officials said Thursday they're investigating an unusual rolling motion on a Southwest Airlines Boeing 737 Max 8 that might have been caused by a damaged backup power-control unit.

The Federal Aviation Administration said it's working with Boeing and the National Transportation Safety Board to investigate the incident on a May 25 flight from Phoenix to Oakland. Southwest says it's working with the FAA and Boeing.

The FAA said the plane went into a "Dutch roll," the name given to the combination of a yawing motion when the tail slides and the plane rocks from wingtip to wingtip — a motion said to mimic the movement of a Dutch ice skater. 

Pilots are trained to recover from the condition, and the plane landed safely in Oakland about an hour later. There were no injuries reported among the 175 passengers and six crew members who were on board.

NTSB investigators have data from the flight's Cockpit Data Recorder, but the Cockpit Voice Recorder only had a 2-hour record time and was overwritten. The NTSB says it wasn't notified until June 7, almost two weeks after the incident occurred.

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