Can oxygen flow be shut off once it is activated?

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Multiple Choice

Can oxygen flow be shut off once it is activated?

Explanation:
Oxygen flow is designed to be continuous once the system is activated, so it cannot be manually shut off by the user. When a mask deploys, the valve opens automatically and begins delivering oxygen immediately, and there isn’t a user-accessible switch to stop that flow. The only way to end the flow is to restore the system to its non-deployed state (or the oxygen source is exhausted and the system is reset on the ground). This design ensures a reliable supply of oxygen during a decompression or smoke event, so the correct choice is that you cannot shut it off once activated.

Oxygen flow is designed to be continuous once the system is activated, so it cannot be manually shut off by the user. When a mask deploys, the valve opens automatically and begins delivering oxygen immediately, and there isn’t a user-accessible switch to stop that flow. The only way to end the flow is to restore the system to its non-deployed state (or the oxygen source is exhausted and the system is reset on the ground). This design ensures a reliable supply of oxygen during a decompression or smoke event, so the correct choice is that you cannot shut it off once activated.

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