What is the designed purpose of thermal plugs in tubeless tyres on modern aircraft?

• A. To increase tyre life
• B. To improve traction
• C. To relieve pressure during excessive tyre heat
• D. To reduce weight

Answer: (C)

Thermal plugs are automatic safety devices in tubeless aircraft tires. When a tire overheats—such as from heavy braking or sustained high-speed taxiing—the air inside heats up and pressure can rise dramatically. The plug contains a heat-sensitive element that opens at a specific temperature, allowing air to vent and relieving the internal pressure. This controlled release helps prevent a catastrophic tire blowout. It’s not primarily about increasing tire life, improving traction, or reducing weight.