Head of the investigators from the National Transport Safety Committee (KNKT) Mardjono Siswosuwarno said, "The second-in-command, known as co-pilot, who usually sits to the right of the cockpit, was flying the plane at the time of crash. The captain, sitting to the left, was the pilot monitoring."

Addressing a press conference at the office of the committee, Mardjono said both the flight data recorder and the voice cockpit recorder indicated that the Airbus A320-200 with 162 passengers and crew on board was flying within the limits of its weight and balance envelope before the crash.

"The plane was on sound condition for flight before the accident, and was flying within the limits of weight and balance envelope. All crew had valid licences and medical certificates," Mardjono said.

However, Indonesia's search for dozens of victims still unaccounted for from last month's crash of an AirAsia passenger jet could end within days if no more bodies are found, a senior government official said.

The Airbus A320 vanished from radar screens in bad weather over the Java Sea on December 28, less than half-way into a two-hour flight from Surabaya, Indonesia's second-biggest city, to Singapore. All 162 people on board were killed.

Indonesia's civilian National Search and Rescue Agency said it would scour the sea for bodies for at least another week.

The military withdrew from the search on Tuesday, apologising to the victims' families for not being able to do more after a month of work.

A multinational search and recovery operation has found 70 bodies in the Java Sea and had hoped to find more after finding the fuselage of the plane. But days of rough weather and poor underwater visibility hampered navy divers' efforts.

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