NTSB exam finds multiple cracks in part of United jet’s engine that dropped parts in Denver

This photo provided by The National Transportation Safety Board shows the damaged engine of United Airlines Flight 328. Federal safety officials are updating their investigation into the engine failure on the United Airlines plane that sent parts of the engine housing raining down on Denver-area neighborhoods last month. The National Transportation Safety Board said Friday, March 5, 2021 that a microscopic exam confirmed that a fan blade that snapped off had telltale signs of fatigue — tiny cracks caused by wear and tear. (The National Transportation Safety Board via AP)