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The co-pilot of AirAsia Flight QZ8501, French national Remi Plesel, was controlling the plane before it crashed, say Indonesian investigators, the BBC reported.

Authorities said this information came from the flight data recorder, which was retrieved along with the cockpit voice recorder earlier this month.

The plane was carrying 162 people from the Indonesian city of Surabaya to Singapore when it crashed into the Java Sea on 28 December.

Only 70 bodies have been recovered.

Mardjono Siswosuwarno, head investigator of Indonesia's National Transportation Safety Committee (NTSB), said the flight data recorder had provided a "pretty clear picture" of what happened in the flight's last moments.

Capt Plesel was in charge from take-off until the cockpit voice recording ends, he said, adding that this was common practice.

Investigators said the plane ascended sharply before dropping, rising from 32,000ft (9,750m) to 37,400ft within 30 seconds, then dipping back to 32,000ft. The process took about three minutes.

Mr Mardjono said the plane was "flying before the incident within the limits of its weight and balance envelope" and that the flight crew all had correct licences and medical certificates.

A preliminary report has been submitted to the International Civil Aviation Organization, but has not been made public. The the full report is likely to take about seven months, said the committee's chief Tatang Kurniadi.