What are wheel assemblies and fusible-plug temperatures?

• A. Wheel assemblies include rims, brakes, and tires; fusible plugs melt around 300-400°F to relieve pressure.
• B. Wheel assemblies are the same as landing gear and have no temperature-related concerns.
• C. Fusible plugs melt around 300-400°F, and wheel assemblies are not involved.
• D. Wheel assemblies include rims and tires; fusible plugs melt around 700-800°F.

Answer: (A)

Wheel assemblies are the rotating part of the landing gear that carries the tire and includes the rim, brakes, and hub. In tire/wheel safety, fusible plugs are built into the wheel assembly and are designed to melt at a relatively low temperature to relieve excess pressure if the tire overheats, helping prevent a blowout. The typical fusible-plug temperature is about 300–400°F (roughly 150–205°C). So this option correctly pairs the wheel assembly components (rim, brakes, tires) with the actual fusible-plug temperature range. The other statements misstate either what the wheel assembly includes or the temperature at which fusible plugs operate, or they claim temperature concerns don’t apply.