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Boeing announced Saturday that it was grounding all its 777 aircraft worldwide following engine fire on one of them in Colorado on February 20, 2021. The company grounded Boeing's 737 MAX in 2019 following safety concerns but the model is back in business.

World

Boeing grounds 777s after engine fire in Colorado

Debris from the failed engine of a United Airlines airplane in the Denver suburb of Broomfield © Broomfield Police Department/AFP/File

New York, United States, Feb 22 – Dozens of Boeing 777 planes were grounded worldwide Monday following a weekend scare on a United Airlines’ plane that suffered engine failure and scattered airplane debris over suburban Denver.

The incident on the flight out of Denver — which quickly returned to the airport after part of the engine caught fire and broke off — prompted United and other airlines to ground planes with the same Pratt & Whitney engine.

While no one was injured in the Denver incident, the episode is the latest setback for Boeing, which only recently resumed deliveries of the long-grounded 737 MAX following two fatal crashes of that plane.

Aviation experts said the incident especially raised questions about Pratt & Whitney and United over engine maintenance.

“It’s nothing like the MAX,” said Teal Group aviation analyst Richard Aboulafia. “After all these years of service it is unlikely to be a design issue with the engine, certainly it is something to do with maintenance.”

The Denver incident followed a Japan Airlines 777 incident in December involving the same type of engine, as well as an engine problem in February 2018 on a United flight.

“There might be a common theme” among the three incidents “but until the investigation is complete, we don’t know that,” said Scott Hamilton of Leeham News, an aviation news site.

Boeing said all 128 of the 777s with Pratt & Whitney engines were grounded following Saturday’s emergency landing of United flight 328 to Hawaii.

Of the 128 planes, only 69 were in service while 59 were in storage.

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Besides United, which removed 24 planes from service, affected carriers included Japanese carriers, Japan Airlines and All Nippon and South Korean airlines, Asiana and Korean Air.

Egyptian state newspaper Al Ahram reported Monday that national carrier Egyptair is grounding four planes with this type of engine. However, those aircraft were not presently in service, a source close to the manufacturer said.

British Transport Secretary Grant Shapps announced a temporary ban on jets with Pratt & Whitney 4000-112 series engines from entering UK airspace.

– Engine on fire –

A video shot from inside the United aircraft — which had 231 passengers and 10 crew on board — showed the right engine ablaze and wobbling on the wing of the Boeing 777-200.

There were no injuries on the plane or on the ground © GETTY IMAGES NORTH AMERICA/AFP / Michael Ciaglo

Residents in the Denver suburb of Broomfield found large pieces of the plane scattered around their community.

The US Federal Aviation Administration (FAA) has ordered extra inspections after the incident.

FAA chief Steve Dickson said a preliminary safety data review pointed to a need for additional checks of the jet engine’s fan blades, unique to the model and only used on 777 planes.

FAA officials met with Pratt & Whitney and Boeing representatives Sunday evening, he added.

The US National Transportation and Safety Board (NTSB) said a preliminary investigation indicated two fan blades fractured on the number 2 engine on the plane.

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“The airplane sustained minor damage,” the NTSB said Sunday. “The examination and documentation of the airplane is ongoing.”

In a briefing Monday, NTSB chair Robert Sumwalt reiterated that two fan blades were damaged but there had been “no structural damage” to the plane.

“Our mission is to understand not only what happened but why it happened, so that we can keep it from happening again,” he said.

Pratt & Whitney said it was cooperating with the NTSB probe and “will continue to work to ensure the safe operation of the fleet.”

United said it was removing the aircraft from its schedule, “and will continue to work closely with regulators to determine any additional steps.”

Japan’s transport ministry earlier said it had ordered stricter inspections of engines after a Japan Airlines 777 plane flying from Haneda to Naha experienced trouble with “an engine in the same family” in December.

– Navigating industry downturn –

The engine failure is unwelcome news for Boeing, which also faces a fresh investigation in Holland after a Boeing 747-400 cargo plane showered a small townwith debris injuring two people — the same day as the Denver incident.

“We have started a preliminary investigation,” said Luisa Hubregtse of the Dutch Safety Board. “However, at this stage it’s too early to draw any conclusions.”

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Boeing only recently resumed deliveries of the 737 MAX following a 20-month global grounding after two tragic crashes killed 346 people.

The MAX began returning to commercial service in late 2020, a time when airline travel remains depressed due to the coronavirus pandemic.

Boeing executives said last month they expect it will take about three years for activity to return to pre-pandemic levels.

Michel Merluzeau, an expert at consultancy AIR, agreed the latest problem did not appear to result from poor plane design.

“It’s not really a problem for Boeing,” he said. “It’s more an issue of maintenance — how United or Pratt & Whitney is maintaining engines that have been in use for a while.”

Hamilton of Leeham News said the episode “is an embarrassing headline, but as a practical issue, it will have no impact on Boeing.”

Noting the weak demand for longer-service planes during Covid-19, Hamilton predicted some carriers could opt to retire the planes rather than return them to service.

Shares of Boeing fell 2.1 percent to $212.88, while Pratt & Whitney’s parent company Raytheon Technologies fell 1.7 percent to $73.00.

United rose 3.5 percent to $49.70, joining other carriers in rallying after a positive note from Deutsche Bank about the industry’s prospects amid improving Covid-19 trends.

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