Authorities earlier said that flight data and cockpit voice recorders from the plane stopped recording about four minutes before the disaster.

Experts who had flown the same type of aircraft involved in the crash have also questioned the presence of the concrete barriers along the runway – with some suggesting that the casualty toll would have been lower if they were not there.

The concrete structure holds a navigation system that assists aircraft landings, known as a localiser.

South Korea’s transport ministry had said this system could also be found in other airports in the country and even overseas.

Last week, authorities announced that they will change the concrete barriers used for navigation at seven airports across the country. Seven airports will also have their runway safety areas adapted following a review.

The preliminary report has been submitted to the United Nations’ aviation agency and to the authorities of the United States, France, and Thailand.