Indian investigators released a preliminary report regarding an August flight from Phuket to New Delhi. The Air India A320 experienced a stall warning at cruising altitude while seatbelt signs were off.
A sudden pitch change during the event injured 24 passengers and crew members. The flight control system detected a total loss of all three hydraulic systems within seconds.
This failure caused the autopilot to disengage automatically. Pilots briefly lost access to primary flight controls before the hydraulic systems began to recover.
Authorities upgraded the investigation status from a serious incident to an accident.