Preliminary report findings on Singapore Airlines incident

> The preliminary report said that upon the flight encountering slight vibrations there was an uncommanded increase in altitude, resulting in the autopilot pitching the aircraft downwards. There was an increase in airspeed and the pilots responded by applying speed brakes.

> “While managing the airspeed … it was heard that a pilot called out that the fasten seatbelt sign had been switched on,” it said.

No expert here for sure, but this looks like a "dispute" between the pilots and the autopilot, interested on some educated first guesses on this

Autopilot in planes need human supervision.