Authorities released a preliminary report on the Air India crash, following an investigation. The London-bound flight from Ahmedabad crashed minutes into the June 12 flight. Only one passenger of the 242 passengers and flight crew survived.

An official report on the world’s deadliest aviation accident in a decade, seen by CNN, has answered one key question – but raised others.

The FAA’s Continued Airworthiness Notification, dated July 11, was issued days after India’s Aircraft Accident Investigation Bureau (AAIB) released its initial findings into last month’s fatal Air India 787-8 crash, which killed all 260 people on board. The report questioned how the aircraft’s engine fuel cutoff switches flipped during takeoff.