Do not deplete an oxygen bottle below what PSI?

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Multiple Choice

Do not deplete an oxygen bottle below what PSI?

Explanation:
Oxygen systems rely on stored gas at a minimum reservoir pressure to push oxygen through the regulator and deliver it to the crew. The regulator is designed to work down to about 50 psi; below that, the flow can become unreliable or stop, leaving you without usable oxygen when you need it most. That’s why you should not deplete the bottle below 50 psi—keep a safety margin and replace or repressurize before it reaches that point. Choices higher than 50 psi would still be safe levels, but the rule specifies the minimum threshold to avoid calling on it too late.

Oxygen systems rely on stored gas at a minimum reservoir pressure to push oxygen through the regulator and deliver it to the crew. The regulator is designed to work down to about 50 psi; below that, the flow can become unreliable or stop, leaving you without usable oxygen when you need it most. That’s why you should not deplete the bottle below 50 psi—keep a safety margin and replace or repressurize before it reaches that point. Choices higher than 50 psi would still be safe levels, but the rule specifies the minimum threshold to avoid calling on it too late.

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