US and European aviation authorities ordered emergency jet engine inspections similar to a fatal accident earlier this week.
A female passenger died after being nearly pulled out of the cabin of a Southwest Airlines plane from New York to Dallas on Tuesday.
Investigators say there was a mistake with the fan blades of the engine.
Nearly 700 Boeing 737 engines will have to be inspected worldwide in the next 20 days, regulators say.
Fan blade failure due to cracks … could lead to an engine shutdown system, uncontrolled release of waste, [and] possible decompression of the aircraft, "said the US Federal Aviation Administration (FAA) in a statement in which Ultrasound tests are given, they added.
Southwest Airlines Flight 1380, a Boeing 737 carrying 149 people, was forced to make an emergency landing after a disruption one of its CFM56-7B engines has detected a fault at Philadelphia Airport.
An initial investigation found evidence of metal fatigue in which a fan blade was demolished, according to the US National Transportation Safety Board (NTSB) 7B engine is used on more than 8,000 Boeing 737 aircraft worldwide, says the manufacturer.
Wa s did the investigators say?
NTSB chairman Robert Sumwalt told reporters that a fan blade was broken due to metal fatigue that a second break was detected at about halfway.
He could not tell if the incident indicated a fleet-wide problem with the Boeing 737-700.
Mr. Sumwalt also said that a case on the engine should contain parts that would loosen, but due to the speed of impact, 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.
Related Flight Stories:
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.
How did the drama develop?
About 20 minutes after the twin-engine Boeing 737 was launched, Schrapnell pierced the passenger compartment and caused the accident
With oxygen masks over their mouths, the passengers screamed and lunged at the impact.
For a few seconds, the plane rolled at an angle of 41 degrees before it leveled and started an emergency descent, Federal investigators said on Wednesday.
"Southwest 1380, we are single engine," the pilot radioed for air traffic control.
"We've missed a part of the plane, so we need to slow down a bit," she said, adding that some passengers had been h
"Injured passengers, okay, and is your plane physically in flames?" asks a male voice in the tower, according to a record published by officials.
"No, it does not burn, but part of it is missing," replies the pilot, Captain Tammie Jo Shults.
"They said there was a hole and, um, somebody went out," she adds calmly.