How many safety valves provide overpressure and negative pressure relief?

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Multiple Choice

How many safety valves provide overpressure and negative pressure relief?

Explanation:
Two safety valves provide both overpressure and negative pressure relief. One opens when the cabin differential pressure reaches the maximum limit to vent excess air and prevent structural damage. The other opens if the cabin pressure would drop too low, preventing a dangerous vacuum. Having these two independent valves ensures protection in both directions, so the correct number is two.

Two safety valves provide both overpressure and negative pressure relief. One opens when the cabin differential pressure reaches the maximum limit to vent excess air and prevent structural damage. The other opens if the cabin pressure would drop too low, preventing a dangerous vacuum. Having these two independent valves ensures protection in both directions, so the correct number is two.

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