Helicopter echelon is also the most difficult flight formation because of its large size and heavy weight. When flying over Tiananmen Square in the form of "meters per second", in order to overcome the great influence of airflow, although the flight formation has not changed at all from the appearance, every pilot keeps changing his movements in the cabin.

The helicopter spacing is only 30m× 30m.

The helicopter formation under reading adopts dense formation, and the distance between the aircraft is only 30 meters ×30 meters, which is the most technically difficult. This is also a safety warning line for helicopter spacing. Different from the fixed-wing aircraft formation, the fixed-wing aircraft has good stability, and it is no problem to fly to 5 meters by 5 meters. Helicopter is a rotorcraft, and its propeller rotates at high speed, which is greatly influenced by airflow. Once a collision occurs, the consequences are unimaginable.

Under normal circumstances, the distance between two planes should be kept above 40m× 50m, which was also adopted in the military parade on the 50th anniversary of the National Day. In this military parade, the helicopter formation adopted a minimum safety distance of 30 meters ×30 meters, which is also a safety warning line for helicopter spacing. With such a spacing, the viewing effect will be very shocking.

In order to improve the quality of flight training, they adopted the last elimination system and selected the best reference pilots. At the end of each training phase, officers and men left the reference competition lineup with regret.