The co-pilot of AirAsia Flight 8501 was flying the doomed jetliner as the captain monitored the flight in the moments before it crashed on Dec. 28, killing al 162 people aboard, Indonesia's lead investigator said Thursday.
"The second-in-command, popularly known as the co-pilot, who usually sits to the right of the cockpit, at the time, he was flying the plane," said National Transport Safety Committee investigator Mardjono Siswosuwarno, referring to the French first officer, Remi Plesel, Reuters reported.
The Airbus A320 went down mysteriously in the Java Sea less than halfway through a two-hour flight from Surabaya in Indonesia to Singapore.
Thought few details have been released, Siswosuwarno said info from the flight data recorder – the so-called black box – yielded a "pretty clear picture" of the final moments of the ill-fated flight.
Investigators have said the plane climbed suddenly from its cruising altitude before stalling – or losing lift – before plunging into the water.
Officials used a model of the Airbus to show how it veered left and climbed to more than 37,000 feet before quickly losing altitude.
Captain Iriyanto, 53, took over the controls from the less experienced co-pilot as the plane initially climbed, officials said.
The stall warning – repeating the words "Stall! Stall!" – sounded in the cockpit in the frantic moments before the plunge. The plane was still in a stall when the black box recordings ended right before hitting the water, Siswosuwarno said.
Meteorological officials have said that seasonal tropical storms likely contributed to the crash – drawing speculation that there were similarities to the crash of Air France Flight 447 over the Atlantic in 2009.
The Air France pilots put the aircraft into a stall after icing on the plane caused them to lose airspeed readings. Investigators were still looking into the possibility that ice also affected the AirAsia jet's airspeed indicators.
The head of the National Transport Safety Committee last week said there were "no similarities" between the AirAsia and Air France incidents.
Sources have told Reuters that icing on the airspeed indicators does not seem to have been an issue with AirAsia flight.
Investigators said the AirAsia plane was in sound condition and that its crew members were properly certified before it took off on the fateful flight.
"The plane was flying before the incident within the limits of its weight and balance envelope," Siswosuwarno said. "While the flight crew had valid licenses and medical certificates."
NTSC head Tatang Kurniadi said the preliminary report on the accident was submitted to the International Civil Aviation Organization.
He said the report, which has not been made public, contained no analysis and that the final version would take about six to seven months to complete.
A search and recovery operation has found 70 bodies in the Java Sea. Searchers had hoped to find more victims after finding the plane's fuselage, but bad weather and poor visibility hampered their efforts.
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