The co-pilot of AirAsia Flight QZ8501 was controlling the plane before it crashed, according to Indonesian investigators.
This new information comes from the flight data recorder which was recovered from the Java Sea earlier this month, the BBC reports.
The data records that the aircraft climbed sharply before descending, going from 32,000ft (9,750m) to 37,400ft in 30 seconds, then dropping to 32,000ft.
The plane, which crashed en route from Surabaya to Singapore on December 28, had 162 people on board. So far 70 bodies have been recovered. The civilian National Search and Rescue Agency said Wednesday that their search efforts will continue, but could end next week if more bodies aren’t found.