The Federal Aviation Administration is investigating a Southwest Airlines flight which dropped at a maximum descent rate of about 4,400 feet a minute.
The NTSB said the plane experienced what the crew said was a "Dutch roll" at 34,000 feet while en route from Phoenix, Arizona to Oakland, California on May 25. Such lateral asymmetric movements are named after a Dutch ice skating technique and can pose serious safety risks. The memo said "safety data confirmed the crew received a "DON'T SINK" oral warning followed by a "PULL UP" oral warning, but the first officer later said the crew did not hear the warnings.
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