Explained: Here’s What Caused The Engine Of United Airlines Flight 328 To Explode Mid-Air United States: One of the engines of a Boeing 777 bound for Hawaii blew apart minutes after take-off from Denver International Airport on Sunday, forcing the plane to make an emergency landing AP Photo Associated Press (AP) 2021-02-23T14:41:13+05:30 Explained: Here’s What Caused The Engine Of United Airlines Flight 328 To Explode Mid-Air outlookindia.com 2021-02-23T14:45:23+05:30 Also read Authorities investigating the engine explosion onboard United Airlines Flight 328 are focusing on a fan blade that appeared to be weakened by wear and tear, a development reminiscent of a fatal failure on board another plane in 2018.