第三发燃油油量显示失效(摆动)，但发动机工作正常。

Fuel flow indicator of no. 3 engine out of operation (fluctuating) but we found no. 3 engine working normally.

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调查显示，挑战者号发射当日低温，导致火箭推进器上橡胶O行环密封圈失效，进而引起爆炸性气体泄露。

Theinvestigation showed that low temperatures on the day of the launch caused arubber “O-ring” seal on one of the rocket boosters to fail, which led to a leakof explosive gases.

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这个事例所显示的到期失效基于expire_page方法。

This example shows invalidation based on the expire_page method.

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