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Like the two 737 occurrences, the three PW4000-powered 777 failures—two involving United Airlines 777-200s and one involving a Japan Airlines 777-200—spotlighted a few of the same risks.
Boeing succeeded, but investigations into the recent engine failures spotlighted scenarios that modeling used during the 777-200 and 737-700 certification was not sophisticated enough to predict.
It’s not United’s first incident with the aircraft type. In February 2021, a United Boeing 777-200 suffered an in-flight engine failure just after take-off from Denver International airport.
PW4000-powered 777s were grounded while all engine fan blades went through additional inspections. United said earlier this month that most of the 777-200s were back in service.
U.S. FAA to require strengthening key part on Boeing 777 engine By David Shepardson May 12, 202112:09 PM PDTUpdated May 12, 2021 ...