A landing gear support broke as a Delta Air Lines regional jet was landing before it flipped upside down, leaving passengers “hanging like bats” at Toronto Pearson International in February, according to a preliminary report from Canada’s Transportation Safety Board.

The alert system on a Delta jet that flipped upside down and burst into flames as it tried to land indicated a high rate of descent.

A preliminary report on a Delta plane that rolled over upon landing in Canada did not determine its cause but found that the right main landing gear broke on impact due to a steep descent rate.