What is the purpose of fusible plugs in the wheels?

Fusible plugs are designed to mitigate the risk of tire blowouts, particularly in aircraft. These components are made from a material that has a relatively low melting point, allowing them to respond effectively to the heat generated during prolonged braking or excessive operation. When the temperature reaches a critical point, the fusible plug will melt, allowing tire inflation pressure to be released gradually. This controlled depressurization helps prevent a sudden blowout, which can be dangerous during operations.

The mechanism behind this is essential for aircraft safety, as it ensures that the tires can vent excess pressure without failing catastrophically. The importance of this function often outweighs other considerations, which is why fusible plugs play a critical role in maintaining the integrity of the aircraft's wheel assembly under stress. Therefore, the primary purpose of fusible plugs is to prevent tire blowout by allowing for safe pressure release in high-temperature situations.