Boeing failed to provide adequate training, guidance and oversight to prevent a mid-air cabin panel blowout of a new 737 MAX 9 flight in January 2024 that spun the planemaker into a major crisis, the National Transportation Safety Board said on Tuesday.

The first six minutes of the flight to Southern California’s Ontario International Airport were routine. The Boeing 737 Max 9 was about halfway to its cruising altitude and traveling at more than 400 mph (640 kph) when passengers described a loud “boom” and wind so strong it ripped the shirt off someone’s back.

Boeing (NYSE:BA) failed to provide adequate training, guidance and oversight to prevent the midair cabin panel blowout in a new 737 MAX 9 flight in January 2024, the National Transportation Safety Board said Tuesday,