The Pratt & Whitney engine that failed minutes into United Airlines flight 328 showed signs of metal fatigue, investigators with the National Transportation Safety Board said during their first public briefing on Monday.
원문출처 : https://www.cnn.com/2021/02/22/us/boeing-aircraft-engine-fail-monday/index.html
원문출처 : https://www.cnn.com/2021/02/22/us/boeing-aircraft-engine-fail-monday/index.html