Tuesday, February 23, 2021

privileged ‘metal fatigue’


Engine damage on a United Airlines flight in the United States: “metal fatigue” favored

“Metal fatigue” is now the preferred lead by the authorities to explain the spectacular incident that occurred last week on a United Airlines flight in the United States, which led to the immobilization of part of the world fleet of Boeing 777.

A Boeing 777-220 of the American company United Airlines which had just taken off Saturday from Denver (Colorado) for Honolulu (Hawaii) with 231 passengers and 10 crew members had seen its right engine catch fire and lose its fairing, and the pilots had to turn around urgently.

As the plane returned to the airport, a shower of debris, some large, had fallen on a residential area in suburban Denver.

No one was injured on the ground and the aircraft was able to land safely.

The American aircraft manufacturer recommended Sunday evening the suspension of flights of the 128 aircraft concerned around the world, and a spokeswoman confirmed to AFP on Monday that they were all immobilized.

Of these, 69 were in service, including 24 at United Airlines, 13 at Japan Airlines (JAL), 19 at All Nippon Airways (ANA), 7 at Asiana and 6 at Korean Air. The other 59 devices were stored separately.

-Preliminary examination-

In the United States, the Federal Aviation Regulatory Authority (FAA) has ordered additional inspections on these Boeing 777s powered by Pratt & Whitney, and the National Transportation Safety Board (NTSB) is also investigating the ‘incident.

“A preliminary on-site examination indicates damage consistent with metal fatigue,” NTSB chairman Robert Sumwalt said Monday at a press briefing.

He also confirmed that two of the fan blades had been damaged. One of them was found on a soccer field, the other remained lodged in the engine.

FAA officials met with representatives from Boeing and Pratt & Whitney on Sunday evening.

The US engine manufacturer said he was cooperating with the NTSB and “will continue to work to ensure the safe operation of the fleet.”

United Airlines, for its part, has decided to remove the aircraft from its flight schedule and will continue to work closely with regulators to determine additional steps. “

The United Kingdom decided on Monday to ban its airspace to the Boeing 777s concerned. And Japan’s Transport Ministry said it ordered more stringent inspections of the Pratt & Whitney engine after a Japan Airlines (JAL) 777 flew from Tokyo Haneda Airport to Naha on the island of Okinawa, experienced problems with “one engine from the same family” in December.

-New test for Boeing-

Boeing’s stock lost more than 2% on Monday on the stock market. The incident is a further setback for the aircraft manufacturer, which is just recovering from the crisis of the 737 MAX, its flagship aircraft which was grounded in May 2019 after two accidents that left 346 dead.

After nearly two years of a ban, a modification of the flight control software and the implementation of new pilot training protocols, the 737 MAX was recently cleared again for flight.

Boeing is also, like its rival Airbus, affected by the Covid-19 pandemic and its catastrophic consequences on international air transport. This health crisis led to the cancellation of orders for hundreds of devices.

The Dutch authorities also announced Monday the opening of two investigations after the fall two days earlier of debris from a Boeing 747-400 cargo plane, which injured two people in the south of the Netherlands.

Several experts believe, however, that the 777 incident in the United States is more a maintenance or engine problem than the design of the plane by Boeing.

In service for more than 25 years without major accident, the device “has a very solid reputation”, underlined Michel Merluzeau, expert of the AIR firm.

The current problem “has nothing to compare” with the crisis of the Boeing 737 MAX, also estimated Richard Aboulafia, an analyst of the Teal Group, specialist in aeronautics. “After all these years of service it is unlikely that this is an engine design issue, it is definitely something to do with maintenance,” he said.



#privileged #metal #fatigue

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