Emergency Landing Plane Debris
A man looks over debris that fell off a plane as it shed parts over a neighborhood in Broomfield, Colo, Saturday. Photo: AP

Boeing: 777s with engine that blew apart should be grounded


Boeing has recommended that airlines ground all 777s with the type of engine that blew apart after takeoff from Denver this weekend, and most carriers that fly those planes said they would temporarily pull them from service.

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 neighborhoods. None of the 231 passengers or 10 crew were 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.”

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

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.

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 due to 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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Appears that Boeing a learned something from prior mistakes.

Good call, even though nobody was hurt.

1 ( +1 / -0 )

Nerdy discussions about this: https://arstechnica.com/tech-policy/2021/02/boeing-recommends-grounding-777s-with-pratt-whitney-engines/

A few comments by people who work at P&W. Everyone there agrees this isn't a Being issue. Rather, it is a P&W failure. No matter what any jet engine does, fan blades or explosions should never exit the protective cowling. Never.

All the plane are over 15 yr old.

Customers select which engines to use. Most use GE engines. These P&W engines are the least efficient today in those aircraft.

1 ( +1 / -0 )

This particular plane was the 5th B777 to come off the production line, in 1995.

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No mention of grounding the Boeing 747-400s despite a P&W engine on one of those also shedding parts over the Netherlands on the same day as the B7777.

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Boeing is a bad example of business ethics.

-3 ( +0 / -3 )

How so, Tara? Their product is the Triple 7. And after three failures of the PW engine in a short time, they want to protect their product and have the engine problems investigated.

1 ( +1 / -0 )

Pratt + Whitney are a subsidiary of Raytheon, I believe. This is not really a Boeing problem, but they have acted swiftly and properly. (Yet to hear about what they do concerning the other engine failure on Saturday that Hello Kitty 321 mentions above, which hit some people on the ground.)

0 ( +0 / -0 )

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