"Veering left and wobbling" before the climb..
Investigator: Co-pilot was flying AirAsia Flight 8501
Ertata Lanang Galih, a senior pilot and investigator, said after requesting permission to ascend, the plane was veering left and wobbling, CNN reported. Siswosuwarno said it then ascended to 37,400 feet in about 30 seconds, according to the broadcaster.