The co-pilot of AirAsia Flight QZ8501 was flying the passenger jet when it crashed last month, killing all 162 people on board, officials say.
Mardjono Siswosuwarno, head investigator for Indonesia's National Transportation Safety Committee, said the plane was in good condition and that all crew members were properly certified.
He said the aircraft's flight recorder gave a "pretty clear picture" of what happened in the final moments before it crashed on December 28.
Last week, officials said the plane had been "climbing too quickly" before the crash.
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