Which component protects against excessive tire pressure in aircraft wheels?

The fusible plug serves as a critical safety component designed to protect against excessive tire pressure in aircraft wheels. It operates through a temperature-sensitive mechanism that melts at a certain temperature. When the tire pressure exceeds a safe limit, typically due to excessive heat generated during operation or servicing, the fusible plug will melt, allowing air to escape from the tire. This prevents the tire from bursting due to over-inflation or extreme heat conditions, thereby enhancing safety on the aircraft.

While there are other components in the wheel assembly, such as pressure relief valves which could also help regulate pressure, the fusible plug specifically aims to mitigate the risk of catastrophic failure by relieving pressure during conditions that could lead to tire explosion. This passive safety feature is essential for managing risks associated with high temperatures and pressures generated during flight operations or ground handling.