The Federal Aviation Administration is investigating after a Southwest Airlines flight reportedly plunged to “within 400ft” of the Pacific Ocean during a flight.
A memo distributed to Southwest pilots, obtained by Bloomberg, said that the Boeing 737 Max 8 plunged at a rate of 4,000ft a minute off the coast of Hawaii, coming within hundreds of feet of the ocean before climbing to safety.
News of the incident comes as investigators said a Southwest-operated Boeing 737 Max 8 sustained significant damage after it did a “Dutch roll” during a flight from Phoenix to Oakland in May.
The plunge off the coast of Hawaii occurred on 11 April, amid adverse weather conditions. The plane had been flying from Honolulu to Lihue when it experienced the rapid descent, Bloomberg reported. The report said the descent took the plane to about 400ft above the ocean, according to data from a flight tracking website.
No one was injured. “Nothing is more important to Southwest than Safety,” the airline said in a statement provided to media outlets. “Through our robust Safety Management System, the event was addressed appropriately as we always strive for continuous improvement.”
The FAA told CNN that it learned of the incident immediately and opened an investigation. The plane eventually re-routed to Honolulu.
In the separate incident, on Friday Bloomberg reported that a Boeing 737 Max suffered damage to parts of the plane’s structure after it went into a “Dutch roll” during a Southwest Airlines flight in May.
The incident happened as the jet cruised at 34,000ft from Arizona to California. Associated Press reported that the plane landed safely, but said Southwest did not notify the National Transportation Safety Board (NTSB) about the roll or damage to the jetliner until 7 June.
“Following the event, SWA performed maintenance on the airplane and discovered damage to structural components,” the NTSB said.
A Dutch roll occurs when the plane’s tail slides from side to side, and the plane rocks in a way that causes the wings to roll up and down.
A report by the FAA said that “substantial” damage was discovered to a unit that controls backup power to the plane’s rudder. It is unclear what triggered the incident, which was the latest to involve a Boeing 737 Max aircraft.
In January the FAA ordered nearly 200 Boeing 737 Max 9 to stop flying after a chunk of fuselage blew out of the plane mid-flight. The planes were allowed to return to the air after undergoing an expansive inspection and maintenance process.
Last year Southwest agreed to pay a record-setting $140m civil penalty after a December 2022 holiday meltdown left 2 million passengers stranded at airports around the US. The airline canceled 8,000 flights over a four-day period, following a winter storm.
The US Department of Transportation found that Southwest violated consumer protection laws by failing to provide adequate customer service assistance “via its call center to hundreds of thousands of customers”, as well as failing to provide prompt flight status notifications to more than 1 million passengers and prompt refunds to thousands.
