The plane took off at 2.36pm WIBand contacted ATC at an altitude of 1,700 feet (around 51,816 metres), AirNavIndonesia head Pramintohadi Sukarno told a parliamentaryhearing on the accident on February 3.
It was then instructed to ascend toan altitude of 29,000 feet, and while doing so it requested a 0.75-degreedirection from ATC for weather reasons, Sukarno said, adding that it wasapproved and instructed by ATC to ascend to 11,000 feet.
The instruction was answered with“clear” by the pilot, he said.
When SJ182 reached an altitude of10,600 at around 2.39pm WIB, it asked ATC to climb to 13,000 feet, and thepilot again responded well to the confirmation.
During that three-minute timeframe,there were no indications of the aircraft being in abnormal conditions,according to Sukarno.
At 2.39pm WIB, the plane wasobserved on the ATC radar screen turning left towards the northwest, but thisshould have been 0.75 degrees to the right, and it then disappeared from theradar screen, he said, confirming that ATC tried to contact the pilot 11 times but there was no response./.