Cause analysis of China Southern Airlines15.8, 997 air crash.

1. Due to the heavy rain at night, the visibility is poor, the runway is flooded, the lighting effect is not good, and the ground is unclear. In this case, the crew did not take the go-around measures decisively, violated the regulations, continued to approach and descend the altitude, lost the initiative and delayed the opportunity, which was the main reason for the abnormal landing and the ultimate cause of the accident.

2. When the aircraft approached the platform with the altitude of170ft, a warning of "low glide slope" appeared in the cockpit, and then the crew corrected the aircraft to return to the normal glide slope without reducing the throttle. The plane didn't see the road clearly until 2-3 seconds before landing, and the direct cause of the plane jumping when landing was that it didn't maintain the correct landing posture.

3. After the plane parachuted for the first time, the altitude was 5 feet, and the grounding vertical overload 1.9G crew did not make up their minds to take off the throttle. The second jump is 7 feet, the grounding vertical overload is 2.54G, and the third jump is 13 feet. Three consecutive jumps and overloading caused serious damage to the aircraft structure.

4. Due to the damage of the control system, the plane left the ground at a speed of 183 knots and a small elevation angle of 2 degrees during the go-around (the crew felt that the steering rod was "light" and "the rod was weightless" after the plane left the ground), and the crew went around after the serious damage of the plane, which laid a hidden danger for the second landing.

5. After going around, "main warning" and various warnings appeared in the cockpit. After the damaged plane circled twice in the air, the crew decided to land in the opposite direction from north to south. Due to the heavy rain, the aircraft control system failed. Although the pilot pulled the joystick to the end before the crew landed, it failed to change the attitude of the plane flying at a large angle. Finally, the plane broke down and caught fire after hitting the ground at a downward angle of 7.56 degrees.

6. 1997 China Southern Airlines 5.8 air crash Conclusion: The plane encountered heavy rain during the final approach, and the crew went down blindly in violation of the regulations without seeing the road clearly; Due to the inaccurate judgment of altitude, the plane did not maintain the correct landing attitude, which led to the heavy landing jump, and the pilot's manipulation error was the direct cause of this major accident. After the go-around, due to the serious damage to the aircraft, some control systems failed, and the crew could not control the landing attitude of the aircraft, so that the aircraft hit the ground at high speed when landing for the second time, resulting in the disintegration and crash of the aircraft. This is a major accident caused by human factors.

Lessons from the 5.8 air crash of China Southern Airlines on July 97;

(1) The crew's work style is lax, and the flight is illegal: the flight preparation is not serious, the crew has insufficient understanding and preparation for complex weather, and no specific flight plan has been made. In the face of the special situation that the five parties were flying in heavy rain, the visibility was poor and the road surface could not be seen clearly, the crew did not cooperate well, and no one reported the flight altitude, speed and related data, which made the captain lose an important reference.

(2) The management of flight technology is not strict, and some captains have low technical quality. After consulting the flight technical files of the crew, it was found that the captain's technical inspection records were from 1994 10 10/0 to 1 9/995 18 three times. Due to the leadership's accommodating care and lax technical control, the actual operation level of some pilots in the company does not meet the technical standards.

(3) lax safety management, dereliction of duty of leading cadres, failure to implement safety production rules and regulations of China Southern Airlines Shenzhen Company, and lack of effective measures in some important links. The flight crew collocation is unreasonable. The two pilots switched from other aircrew positions to learn to drive, and the solo flight time was short, the overall strength of the crew was weak, and the technical level was low, so they were not qualified for the flight task under complex meteorological conditions at night.

(4) The idea of "safety first" is not firm, and the organization and leadership are weak. Since last year, the security situation of China Southern Airlines has been poor, and the leaders have insufficient understanding of the situation and are blindly optimistic and complacent. They did not take fundamental measures to reverse the passive situation, and did not properly handle the relationship between safety and development, efficiency and other work. They don't pay enough attention to safety, and their management can't keep up, which is an important reason for the decline of the technical quality of flight personnel.