On October 7, 2008, at Singapore Changi International Airport, an Airbus a330-303 passenger plane (registration number VH-QPA, first flight on November 5, 2003, production serial number 0553, delivered to Qantas operations on November 26 of the same year) belonging to Qantas Airlines was preparing for take-off, The plane will fly QF72 from Changi International Airport in Singapore to Perth International Airport in Australia. When it was 185 kilometers away from Perth and the cruising altitude was 11278 meters, the captain took over the next flight, but soon the first autopilot suddenly closed. So the captain opened the two autopilot system. But as soon as the plane opened, it issued overspeed and stall warnings, followed by the electronic central system. More error warnings begin to appear. This situation is very rare, and the drivers don't understand what it is. So the captain decided to turn off automatic driving and use manual driving, and then called another co pilot who was preparing to rest to come back and help. But just then the plane suddenly fell and the nose began to dive down. The captain tried to pull up the joystick, but there was no effect. Even if he released it, the plane was still diving. He realized that the system might be manipulating. On his second attempt, he successfully leveled the plane, and the people in the plane fell heavily to the ground. The captain realized that there was something wrong with the plane's computer system. However, when the crew checked, the plane dived down again, and then the plane was leveled again. At this time, another co pilot returned to the cab, and then they sent a distress signal to ATC. In order to prevent the plane from diving again, they decided to alternate to the nearest lilmons, but trouble began to appear on the plane: failure of automatic brake, failure of speed brake, failure of No. 1, No. 2 and No. 3 computers, etc. With so many failures and warnings, the pilot doesn't know how much information on t