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United Airlines engine failed after pilots throttled up to minimize turbulence, NTSB report says

March 5, 2021. Summarized by summa-bot.

Compression ratio: 41.9%. 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 Pratt & Whitney engine part that failed with a fiery bang on United Airlines Flight 328 last month in the skies above Denver had most recently received a close inspection for wear and tear in 2016, investigators said Friday.

(CNN)The Pratt & Whitney engine part that failed with a fiery bang on United Airlines Flight 328 last month in the skies above Denver had most recently received a close inspection for wear and tear in 2016, investigators said Friday.

The report did not make any conclusions about the cause of the incident nor did it prescribe further steps for the Federal Aviation Administration, aircraft operators, or the engine manufacturer to make.

The report said the engine flared up in flames after landing but that "was quickly extinguished" by firefighters.

The NTSB report said the fan blade that failed was inspected using specialized thermal acoustic imaging technology in both 2014 and 2016.

After a 2018 engine incident on a different plane, the 2016 data was analyzed again, the NTSB said.

The report noted that when the fan blade failed last month, it was less than halfway to the point of requiring another inspection -- a detail CNN has previously reported.

Days after the February incident, engine manufacturer Pratt & Whitney recommended dramatically shrinking the interval for the inspection to just 1,000 cycles, according to a service bulletin obtained by CNN.

The FAA issued an emergency directive requiring the fan blades on the engines to be inspected before flying again.

CNN previously reported a Federal Aviation Administration review board met just days before the February engine failure to consider requiring more regular inspections.

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