Half of the systems to detect potentially dangerous wind shear were not working at the time of a crash at a Phuket airport that killed 89 people on board, officials said Tuesday. Forty-one passengers survived the crash.

The budget One-Two-Go Airlines flight OG269 was carrying 123 passengers and seven crew from Bangkok to Phuket when it skidded off a runway Sunday while landing in driving wind and rain, catching fire and engulfing some passengers in flames as others kicked out windows to escape.

Investigators have said wind shear — a sudden change in either wind speed or direction in an aircraft's flight path that can destabilize a plane — was among the possible causes of the crash. While it is too early to definitively say what caused the crash, Kajit Habnanonda, president of Orient-Thai Airlines, which owns One-Two-Go, also pointed to wind shear as a possible factor.