That could translate to roughly 600 pounds of force acting on each of the plane's windows, which is why once the window was blown out, the resulting suction would be enough to pull a passenger from their seat. Fellow passengers were able to pull her back inside but she died of her injuries.
As the plane ascended past 32,000 feet about 20 minutes into the flight from NY to Dallas, the left engine failed and parts of it flew off, shattering the window in Row 14.
Passenger Andrew Needum, a Texas firefighter, said Thursday that he was helping his family and other passengers with their oxygen masks when he heard a commotion behind him.
The Southwest plane sped into Philadelphia International Airport at 190-miles-per hour.
The board said it will more closely examine the fan blades and look for engine parts that fell away after the blast as part of efforts to determine the cause.
Investigators found the blade that detached showed signs of "metal fatigue" - microscopic cracks that can splinter open under the kind of stress placed on jetliners and their engines.
"Engine failures like this should not occur", Robert Sumwalt, chairman of the NTSB, said Wednesday. It said that any fan blades that failed the inspection would have to be replaced.
Martinez said it appeared the plane's left engine had exploded and broken a window in the aircraft's seventeenth row about 30 minutes into the flight. "We can see paint transfer", Sumwalt said. "That's going to be a big focal point for the NTSB - why didn't [the ring] do its job?"
European regulators this month began requiring an inspection by early next year of the CFM56 engine.
In that incident, the Boeing 737-700 from New Orleans was heading to Orlando, Fla. when the fan blade separated from the fan disk, according to a 2016 National Transportation Safety Board news release.
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A well-known Albuquerque woman was killed in the incident.
The Federal Aviation Administration (FAA) said its order for engine inspections would be issued within the next two weeks.
The airline opposed a recommendation by the engine manufacturer to require ultrasonic inspections of certain fan blades within 12 months, saying it needed more time to conduct the work. It said that CFM had sent a service bulletin recommending inspections, leading regulators to make the directive. Investigators found that the engine failed on Tuesday after one of its 24 fan blades snapped off.
Southwest's voluntary, accelerated checks will be ultrasonic.
It was not immediately clear how many planes would be affected.
Following a similar engine explosion in 2016, the FAA proposed an AD that would have required periodic ultrasound inspections of the engines rather than simple visual inspections.
Any design issues with the long-established CFM56 engine could have repercussions for fleets worldwide.
Jennifer Riordan was on Flight 1380 from NY to Dallas when the incident happened. Shults, a Navy veteran and one of the first female fighter pilots in the US military, was at the controls when the jet landed, according to her husband, Dean Shults.
It was also no surprise to her that Tammie Jo Shults was the pilot credited with the skillful landing. She also walked through the aisle and talked with passengers to ensure they were OK after the aircraft touched down. "A huge thank you for her knowledge, guidance, and bravery".
In a recording of conversations between the cockpit and air traffic controllers, an unidentified crew member reported there was a hole in the plane and "someone went out".