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Investigators release preliminary findings on the United Airlines flight engine failure. Here's what we know

February 23, 2021. Summarized by summa-bot.

Compression ratio: 20.4%. 1 min read.

WASHINGTON (Feb. 22, 2021) ??? This image taken Feb. 22, 2021, shows the damage to the number 2 engine of United Airlines flight 328, a Boeing 777-200, following an engine failure incident Saturday. The NTSB is investigating the incident. United Airlines flight 328 experienced a right engine failure after takeoff from Denver International Airport Feb. 20, 2021. The airplane returned safely to Denver; none of the 229 passengers or 10 crewmembers were injured. (NTSB photo)

The investigation into the engine failure of a Boeing 777 could take more than a year, officials said, but already the picture is becoming clearer about what happened to the United Airlines flight on Saturday.

(CNN)The investigation into the engine failure of a Boeing 777 could take more than a year, officials said, but already the picture is becoming clearer about what happened to the United Airlines flight on Saturday.

According to investigators, the Pratt & Whitney engine failed minutes into United Airlines flight 328, headed from Colorado to Hawaii, leaving a mile of debris in its wake.

A preliminary investigation indicates the damage was "consistent with metal fatigue," according to information from the National Transportation Safety Board (NTSB), which has prompted federal regulators to reexamine engine inspections.

"Pratt & Whitney is actively coordinating with operators and regulators to support the revised inspection interval of the Pratt & Whitney PW4000 engines that power Boeing 777 aircraft," the company said.

One of the blades in the plane's right engine broke free at the hub, likely hitting another that was broken mid-span, investigators said Monday.

In the wake of the engine failure, Boeing has recommended suspending the use of 777s that have a Pratt & Whitney 4000 engine, and United Airlines has already pulled them following the incident.

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