179 people – all but two on board – died in the violent plane crash in South Korea.
The cause of the crash is unclear, but the plane was unable to deploy landing gear and bird warnings had been circulated in the area.
– I am inclined to believe that it is the human factor that has a part in this, says Martin Olsson, former CEO of a company that works with safety on runways.
In the player above: The expert unravels the sequence of events, frame by frame.