Net systems consist of two parts: a braking system and a net raising system. They differ from hook systems in the way they catch the aircraft. Rather than having a pendant that catches the aircraft by its hook, they are equipped with a net that wraps the aircraft’s fuselage and wings, as well as a mechanism that raises the net up to the necessary position. When the shear couplings on the net system break off during the aircraft’s arrestment, the net is separated from the raising system and the braking system is activated. The braking system is the same as the ones in the fixed hook systems. Since the net systems are unidirectional, they are installed at the end of runways.