The alert system on a Delta Air Lines jet that flipped upside down and burst into flames as it tried to land in Toronto last month indicated a high rate of descent less than three seconds before touchdown, according to a preliminary report released on Thursday.

The Transportation Safety Board of Canada, which issued the report, continues to investigate the Feb. 17 crash-landing in which 21 people were hospitalized.

All 76 passengers and four crew members survived when the Delta plane arriving from Minneapolis burst into flames after flipping over and skidding on the tarmac. Flight 4819 was operated by Minneapolis-based Endeavor Air, a Delta subsidiary.

Canadian transportation officials said Thursday that “it is too early to draw conclusions as to the causes of this accident.” But the TSB of Canada report does outline the sequence of events leading up to, and after, the crash.

The report says that when the plane’s ground proximity warning system sounded 2.6 seconds before touchdown, the airspeed was 136 knots, or about 155 mph. It says the plane’s landing gear folded into the retracted position during touchdown and the wing detached from the fuselage, releasing a cloud of jet fuel, which caught fire.

The report says the first officer was flying the plane at the time of the crash, while the captain was monitoring. Delta has released information about their background with Endeavor Air and their experience, but has not identified the crew members.

The safety board says its ongoing investigation is focusing on several key areas, including metallurgical examination of the wing structure, landing techniques, pilot training and the passenger evacuation process.

All of those who were hospitalized were released within days of the crash.

At least two lawsuits have been filed in the United States, and a law firm in Canada has said that it’s been retained by several passengers.

Delta issued a statement after the release of the report, saying that “nothing is more important than the safety of our customers and our people. That’s why we remain fully engaged as participants in the investigation led by the Transportation Safety Board of Canada.”

“Out of respect for the integrity of this work that will continue through their final report, Endeavor Air and Delta will refrain from comment,” the statement read.

Collected from Minnesota Public Radio News. View original source here.