TB20 introduction: After the 1990s, the first time most domestic civil aviation pilots had close contact with an aircraft was TB. It has the functions of a complex aircraft, as well as convenient control and advanced airborne equipment, which is more suitable for teaching use. Moreover, its driving positions are arranged left and right like civil aviation airliners. After the trainees enter the airline after training, It can quickly become familiar with the operation of passenger aircraft, and its better fuel economy also reduces teaching costs.