Wheels and brakes
In the same way as propulsion or lift, braking is one of the vital functions on an aircraft. Thanks to the braking function the aircraft is able to come to a halt after landing, taxies in safety and can stop in an emergency if there is a rejected take-off.
Whether on a bicycle, car or aircraft, the problem is the same: the kinetic energy of the moving vehicle has to be absorbed and then transformed into heat in order to dissipate it.
Stopping an Airbus A340 or a Boeing 777 travelling at 300 km/h in a few hundred meters means absorbing more than 1 billion joules in a few tens of seconds - around 125 mega joules per wheel and brake! In this case, the temperature can reach 1832°F (or 1000°C). Although the risk is in the order of 1 in 1 million take offs, it is the most extreme case that Safran Landing Systems' wheels and brakes have to deal with in the unlikely event of a rejected take-off.
To do this, Safran Landing Systems has developed a range of innovative technologies, such as carbon and electric brakes, and can rely on its experience gained from decade-long partnerships on a range of commercial and military programs.