Final answer:
Fusible plugs in aircraft tires serve as a critical safety mechanism by melting at high temperatures to release air pressure and avoid tire explosions.
Step-by-step explanation:
The purpose of fusible plugs on an aircraft tire is to provide a safety feature that can prevent tire explosions due to excessive heat buildup. When a tire is exposed to extreme temperatures, the fusible plug is designed to melt at a specific temperature threshold, allowing the pressurized air inside the tire to be released in a controlled manner. This deflation helps to avoid a tire burst, which can lead to significant damage and pose a safety risk. The controlled release of air cools down the tire and prevents a possible fire or more extensive damage to the aircraft.