Why do airplane tires cause smoke at touchdown?

When an aircraft touches down during landing, the appearance of smoke is a common sight. This occurrence arises from a combination of factors related to the landing procedure and the characteristics of the tires themselves.

As the aircraft descends and prepares for touchdown, the tires are stationary. Upon contact with the ground, they rapidly accelerate from a standstill to an average speed of 240 to 260 km/h. This sudden burst of motion creates friction between the tires and the runway surface, resulting in the emission of smoke.

The smoke stems from the considerable heat generated by the friction between the rubber tires and the asphalt runway. This heat is sufficient to cause the rubber to almost vaporize, resembling the smoke produced when a bike tire skids against the road.

Several variables influence the intensity and occurrence of smoke during landings. The frequency of landings a tire experiences within a specific timeframe, such as within 24 hours, impacts its level of wear and tear. Airlines rigorously inspect tire conditions before each flight, promptly replacing them if any damage or signs of deterioration are detected to uphold safety standards.

The design and resilience of aircraft tires are influenced by the type of aircraft and its operational demands. For example, the tires used on an Airbus A330-200 differ in composition and load capacity compared to those designed for conventional automobiles. Furthermore, environmental factors such as runway temperatures and altitude variations contribute to tire performance.

Aircraft tires are meticulously engineered to endure the demanding conditions of takeoff and landing. They incorporate multiple layers of nylon for reinforcement and a wire core to prevent slippage on the rim. Moreover, these tires are filled with nitrogen, offering superior properties compared to conventional compressed air for aviation purposes.