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It's a horror scenario: On Saturday afternoon, large aircraft parts detach from a Boeing 777 with more than 240 people on board.

The machine had to make an emergency landing.

The first findings on the cause of the engine failure are now available - according to this, it is due to material fatigue.

For this reason, a fan blade in the PW4000 engine was probably broken, as the head of the NTSB traffic safety authority said on Monday (local time).

Four minutes after departure from Denver there was a loud bang, said head of the authorities Robert Sumwalt.

The fuselage of the 26-year-old aircraft was slightly damaged as a result.

The right engine failed.

A shock on the ground and on board

Before the case could be compared with any other Pratt & Whitney engine of this type, all the circumstances surrounding the incident must be clarified.

It is still unclear why the cowling of the engine came off and it burned, although the kerosene supply had been switched off.

The 231 passengers and ten crew members were en route to the capital of Hawaii, Honolulu.

Most of them were able to continue the journey on another flight.

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Boeing said it is recommending that the 69 operating and 59 stored 777s with Pratt & Whitney 4000-112 engines be suspended while the NTSB investigation is ongoing.

You support the measures of the Japanese Civil Aviation Administration and the FAA to suspend the operation of the machines and work with them.

The incident was a nightmare not only for the people on the plane, but also for those on the ground.

The aircraft parts crash into a residential area not far from the US city of Denver in the state of Colorado.

"I'm honestly shocked," said Broomfield police spokeswoman Rachel Welte.

It is "astonishing" that, according to initial findings, no one was injured by debris in the place.

Curious: there was a very similar incident in Maastricht in the Netherlands over the weekend.

However, two people were actually injured.

Airplane parts landed on a sports field

A large piece of debris fell into the front yard of a house, other parts of the aircraft landed on a sports field.

Police spokeswoman Welte reported that the people were mainly startled by the noise.

"A lot of people said they heard this really loud explosion that scared a lot of people, and then they saw what they thought was an airplane falling from the sky, but it was debris."

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Kirby Klements told the Denver Post that he was sitting with his wife in the living room and reading the newspaper when there was a loud bang.

At first he thought that it was part of a trampoline.

When he went out, he immediately realized that part of the engine of an airplane had landed in his front yard.

"It rained a lot of debris from the sky," said Klements.

"Gigantic" black cloud of smoke

It sounded like the sound barrier had been breached, eyewitness Kieran Cain told CNN.

Everyone looked up.

A “gigantic” cloud of black smoke could be seen in the sky - and immediately afterwards the falling parts of the aircraft.

"Virtually a shower of pieces falling from the sky," said Cain.

This hole in the roof was caused by one of the debris

Source: AFP / Michael Ciaglo

A passenger on the UA flight, Travis Loock, heard a "big bang, the kind of noise you don't want to hear when you're on an airplane" around 20 minutes after departure.

After pulling up the cover, "I was quite shocked to see that the engine was missing on my side," CNN quoted the passenger as saying.

He could feel the fear among the passengers, but everyone remained "very calm".

After landing safely in Denver, passengers cheered before disembarking.

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The broadcaster CNN played a recording of the dramatic moment in which the pilot of the plane released the distress signal “Mayday”.

According to some experts, an engine failure is more likely shortly after take-off.

This has to do with the fact that the pilots would have to request so much power from the engines at this point in time to get the plane in the air, said former US Department of Transportation inspectorate chief Mary Schiavo.

There were similar reports from the Netherlands on the same day.

According to police in Maastricht, an elderly woman was hit in the head and had to be treated in hospital.

A child was also reportedly slightly injured and burned when trying to pick up debris from the floor.

According to the police, a fire broke out in one of the four engines of the machine.

The authorities are investigating the incident.

The plane later landed in Liège, Belgium.

It was actually en route from Maastricht Aachen Airport to New York.

There was no evidence that the events in the Netherlands and the USA were related.