Terrifying footage has emerged showing passengers being asked to "brace!" as a United Airlines flight was forced into an emergency landing.
Part of the engine of United Airlines Flight 1175 to Hawaii fell off mid flight.
At first passengers did not know what had happened on the fight after hearing a loud bang.
The pilot declared an emergency and passengers were asked to go into the brace position.
The protective covering from the right engine appeared to have come off mid-flight leaving it completely exposed.