Damage to a fan blade on an engine that failed on a United Airlines Boeing 777 flight is consistent with metal fatigue, based on a preliminary assessment, the chairman of the U.S. air accident investigator said on Monday.
The Pratt & Whitney PW4000 engine failed on Saturday with a “loud bang” four minutes after takeoff from Denver, National Transportation Safety Board (NTSB) Chairman Robert Sumwalt told reporters following an initial analysis of the flight data recorder and cockpit voice recorder.
The damaged starboard engine of United Airlines flight 328 is seen following a February 20 engine failure incident
There was minor damage to the aircraft body but no structural damage, he said.
He said it remained unclear whether the incident is consistent with an engine failure on a different Hawaii-bound United flight in February 2018 that was attributed to a fatigue fracture in a fan blade.
“What is important that we really truly understand the facts, circumstances and conditions around this particular event before we can compare it to any other event,” Sumwalt said.
The engine that failed on the 26-year-old Boeing Co 777 and shed parts over a Denver suburb was a PW4000 used on 128 planes, or less than 10% of the global fleet …read more