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Canada’s airline fleets are not affected by Boeing’s recommendation to ground its 777 aircraft after a dramatic incident during a U.S. flight over the weekend, as the type of engine involved is not in use by Canadian carriers.

The U.S. Federal Aviation Administration ordered United Airlines to step up inspections of the aircraft after one of its flights made an emergency landing at Denver International Airport Saturday as pieces of the casing of the engine, a Pratt & Whitney PW4000, rained down on suburban neighbourhoods. None of the 231 passengers or 10 crew was hurt, and the flight landed safely, authorities said. United is among the carriers that has grounded the planes.

FAA administrator Steve Dickson said in a statement Sunday that based on an initial review of safety data, inspectors “concluded that the inspection interval should be stepped up for the hollow fan blades that are unique to this model of engine, used solely on Boeing 777 airplanes.”

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Mr. Dickson said that would likely mean some planes would be grounded — and Boeing said they should be until the FAA sets up an inspection regime. Japan ordered the planes out of service, according to the financial newspaper Nikkei, while noting that an engine in the same family suffered trouble in December.

Boeing BA-N said there were 69 777s with the Pratt & Whitney 4000-112 engines in service and another 59 in storage.

Air Canada has 25 777s in its fleet, but they use an engine made by General Electric, and are not subject to the grounding recommendation.

Other Canadian airlines such as WestJet, Transat and Sunwing do not use the 777 aircraft.

United had 24 of the planes in service; it is the only U.S. airline with the engine in its fleet, according to the FAA. Two Japanese airlines have another 32 that are being pulled, while Asiana Airlines grounded nine, seven of which were in service, until Boeing establishes a plan to fix the problems. Korean Air said it was discussing whether to ground 16 aircraft, six of which are in service.

“We are working with these regulators as they take actions while these planes are on the ground and further inspections are conducted by Pratt & Whitney,” Boeing said in a statement issued Sunday, referring to American and Japanese regulators.

The engine maker said it was sending a team to work with investigators.

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The emergency landing this past weekend is the latest trouble for Boeing, which saw its 737 Max planes grounded for more than a year after two deadly crashes in 2019 and is suffering amid the huge reduction in air travel because of the coronavirus pandemic. The Max planes began returning to the skies late last year — a huge boost for the aircraft maker, which lost billions during the grounding because it has been unable to deliver new planes to customers.

Video posted on Twitter from Saturday’s emergency showed the engine fully engulfed in flames as the plane flew through the air. Freeze frames from different video taken by a passenger sitting slightly in front of the engine and also posted on Twitter appeared to show a broken fan blade in the engine.

Passengers, who were headed to Honolulu, said they feared the plane would crash after an explosion and flash of light, while people on the ground saw huge chunks of the aircraft pour down, just missing one home and crushing a truck. The explosion, visible from the ground, left a trail of black smoke in the sky.

The U.S. National Transportation Safety Board said that two of the engine’s fan blades were fractured and the remainder of the fan blades “exhibited damage.” But it cautioned that it was too early to draw conclusions about what happened.

United says it will work closely with the FAA and the NTSB “to determine any additional steps that are needed to ensure these aircraft meet our rigorous safety standards and can return to service.”

The NTSB said the cockpit voice recorder and flight data recorder were transported to its lab in Washington so the data can be analyzed. NTSB investigations can take up to a year or longer, although in major cases the agency generally releases some investigative material midway through the process.

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Japan’s Ministry of Land, Infrastructure, Transport and Tourism said an engine in the PW4000 family suffered trouble on a Japan Airlines 777 flying to Tokyo from Naha on Dec. 4. The airline has said the plane had engine trouble after takeoff and returned to Naha. An inspection showed damage to the engine case and missing fan blades, according to the airline. Stricter inspections were ordered in response.

Japan Airlines and All Nippon Airways will stop operating a combined 32 planes with that engine, Nikkei reported.

With files from The Canadian Press

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