If ANY fusible plugs show signs of softening, they must all be replaced.

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Multiple Choice

If ANY fusible plugs show signs of softening, they must all be replaced.

Explanation:
Fusible plugs are a one-time safety feature in aircraft tires that melt at a set temperature to vent air and prevent a runaway tire failure. If any plug shows signs of softening, it indicates the tire has overheated and the plug’s protective function may no longer be reliable. Because these plugs are designed to work as a matched set, replacing them all ensures uniform performance and prevents a partially compromised system. Replacing is required because a softened plug cannot be trusted to respond correctly in future overheating, and inspecting, repairing, or ignoring it could lead to a dangerous tire failure.

Fusible plugs are a one-time safety feature in aircraft tires that melt at a set temperature to vent air and prevent a runaway tire failure. If any plug shows signs of softening, it indicates the tire has overheated and the plug’s protective function may no longer be reliable. Because these plugs are designed to work as a matched set, replacing them all ensures uniform performance and prevents a partially compromised system. Replacing is required because a softened plug cannot be trusted to respond correctly in future overheating, and inspecting, repairing, or ignoring it could lead to a dangerous tire failure.

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