It is normal for an airplane to shake its wings when it encounters airflow, and there is no great danger. Although it is impossible to cause a vicious flight accident, if the crew does not handle it properly, it is likely to cause serious injuries to passengers. In case of bumps, passengers should immediately fasten their seat belts, obey the safety instructions of the flight attendants, return to their seats and stop using the restroom. Even if there is psychological discomfort, it is not recommended to have resistance.

When a sudden strong bump occurs, passengers may stay away from the seat and have no time to return to the seat. Therefore, passengers should immediately squat down and grab the fixable objects beside them, such as seat armrests and seat foot handles. Passengers may be using toilets without seat belts. They should immediately grasp the edge of the washbasin, door handles and other solid objects. There are many toilet models with auxiliary handles next to the toilet. If passengers are eating and using water, especially hot drinks, they can immediately put food on the floor.

The basic cause of aircraft turbulence is the turbulence in the atmosphere. The range of these unstable airflow is large or small, and the direction and speed are also different. When an airplane enters a turbulent vortex similar to the size of the airplane body, all parts of the airplane will be affected by airflow in different directions and speeds, and the original balance of aerodynamic force and moment will be destroyed, resulting in irregular motion. When an airplane enters another vortex from one vortex, it will cause vibration. When the natural vibration period of the aircraft is equivalent to the turbulent fluctuation period, the aircraft turbulence will become very strong.

According to the intensity of turbulence, it can be divided into mild turbulence, moderate turbulence and severe turbulence.

The slight bump is mainly manifested in that people in the seat may feel the slight stress on the seat belt or shoulder strap, and the loose objects may move slightly, so there is almost no difficulty in walking and the cabin service will not be affected.

Moderate bumps are mainly manifested in: people sitting in the seat can feel the force of the seat belt or shoulder strap, 80% of the drinks spill out of the cup, the cabin service is affected, it is difficult to walk in the cabin, and unstable objects are moved.

The violent bump is mainly manifested in that people in the seat feel that the seat belt or shoulder strap is under severe stress, and the unfixed object swings back and forth, left and right, and is thrown up, so that cabin service cannot be provided.