A similar engine failure behind a fatal explosion in the center of an aircraft piercing a passenger plane window was reported in 201
A female passenger died after she had almost been sucked out of the cabin of a Southwest Airlines flight he was traveling Tuesday from New York to Dallas.
Investigators say it's a fault on the fan blades of the engine – the reason for the incident two years ago.
US Aviation Authorities Arrange Inspections of Similar Jet Engines  Southwest Airlines Flight 1380, a Boeing 737 that carried 149 passengers, had to make an emergency landing at Philadelphia airport on Tuesday after a failure with one of its CFM56-7B engines.
A first investigation found evidence of metal fatigue where a fan blade was broken off, according to the US National Transportation Safety Board (NTSB).
A similar incident was registered in 2016 with a Southwest flight that landed safely in Florida.
Fan Blades, which have undergone a certain number of flights, must undergo ultrasound testing, the Federal Aviation Administration (FAA) has said.
She added that the "airworthiness directive", requiring inspections of a large The number of CFM56-7B engines would be achieved within the next two weeks.
The CFM56-7B engine is used in more than 8,000 Boeing 737 aircraft worldwide, according to the manufacturer.
Last year, the FAA estimated that 220 of these engines would have to be tested after a certain number of flights were performed.
On Wednesday, other airlines using aircraft equipped with the CFM56-7B engine, including United Airlines, American Airlines and Delta Air Lines, said they had begun inspecting some of their aircraft.
What did the investigators say? ] NTSB chairman Robert Sumwalt told reporters that a fan blade was broken due to metal fatigue and that a second break was detected at about half the length.
He could not tell if the incident was suggestive of a fleet-wide problem Boeing 737-700.
Mr. Sumwalt also said that a housing on the engine should contain parts that would loosen, but due to the speed, the metal could penetrate the shell.
The FAA did not say how many engines would be inspected. It was said that all fan blades that did not pass the inspection had to be replaced.
In 2016, a Southwest Airlines flight made a safe emergency landing in Florida after a fan blade was disconnected from a similar CFM engine.
Debris tore a hole more than a foot long in the fuselage of the jet above the left wing, causing cabin decompression. An investigation of this event also found evidence of metal fatigue, according to the NTSB.
So what do we know about the engines?
They were developed by the Franco-American joint venture CFM International, stating that it is "the world's leading supplier of jet engines for single-aisle aircraft".
CFM's parent companies send 40 technicians to help Southwest inspect engines. French officials have also said they are traveling to the US to help with the investigation.
In a statement, CFM expressed his condolences to the family of the deceased woman.
Who was the victim?
Jennifer Riordan was a 43-year-old mother of two and a senior executive at Wells Fargo Bank, Albuquerque, New Mexico.
Shrapnel from the mangled engine shattered the window next to her, causing a rapid decompression in the cabin that nearly blew her out of the jet.
Other passengers pulled her back and tried to revive her, but she died of her injuries.
The Philadelphia Medical Examiner said Wednesday that Ms. Riordan had died from a blunt stroke trauma to the head, neck and trunk.
Seven other passengers were slightly injured
Ms. Riordan was the first passenger to be killed in a US traffic accident since 2009.
Who controlled the plane?
Captain Tammie Jo Shults was hailed as a hero by the passengers on the catastrophic flight.
On Wednesday, she and First Officer Darren Ellisor said in a written statement from the airline, "As the captain and first officer of the five-man crew who worked for our clients aboard the Flight 1380 yesterday, we all just feel 'Our hearts are hard. "
- " American Hero "landed airliner
They said they worked with investigators and would not speak to the media.