The flight from Shanghai to Beijing was seriously bumpy, and the flight attendants and passengers were thrown to the top. What are the possible causes of bumps? How dangerous is this level?

There are many reasons for bumps, including but not limited to the following:

1. Unstable airflow: When an aircraft encounters unstable airflow during flight, such as turbulence and airflow shear, it will cause the aircraft to bump. In this case, the plane may suddenly shake up and down, causing discomfort to passengers and crew.

2. Bad weather conditions: bad weather conditions, such as thunderstorms, strong winds and hail. It may also cause the plane to bump. These weather conditions will have an impact on the flight stability of the aircraft, causing the aircraft to be bumped in the air to varying degrees.

3. Aircraft mechanical failure: Aircraft mechanical failure may also cause bumps. For example, the control system failure and engine failure of the aircraft may cause the aircraft to lose its balance in the air, thus bumping.

The degree of turbulence can be judged according to the description of passengers and crew. Severe bumps may cause passengers and crew to be thrown to the top, causing discomfort or even injury. In addition, serious bumps may also cause the aircraft to lose balance and affect flight safety.

In a word, turbulence is a kind of situation that aircraft may encounter during flight, and the possible reasons include unstable airflow, bad weather conditions, aircraft mechanical failure and so on. Severe bumps may affect the safety and comfort of passengers and crew, which needs attention.