What does clearance protection range mean?

The clearance protection range refers to an area set aside to ensure that there are no obstacles on the ground to hinder navigation and flight when the aircraft is taking off and landing at low altitudes. The clearance protection range is for the aircraft to take off and land. Dedicated for drop.

Although the aircraft flies according to the prescribed take-off and landing routes, during the actual flight, affected by various weather, navigation equipment performance and pilot technical level, the actual flight path of the aircraft is often different from the prescribed take-off and landing routes. The flight path deviates to a certain extent, and the airport clearance requirements are mainly determined based on the size of the aircraft's takeoff and landing routes and the extent to which the actual flight deviates from the prescribed flight path.