What activates the emergency cabin oxygen system at any time?

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Multiple Choice

What activates the emergency cabin oxygen system at any time?

Explanation:
The ability to activate the emergency cabin oxygen system at any time rests with the flight deck switch. This manual control lets the crew deploy oxygen immediately in response to depressurization, smoke, or other urgent needs, without waiting for an automatic trigger. Automatic activation, driven by a cabin altitude sensor, occurs only when the cabin pressure or altitude threshold is reached, not on demand. The crew door interlock and the passenger call button do not initiate the oxygen system.

The ability to activate the emergency cabin oxygen system at any time rests with the flight deck switch. This manual control lets the crew deploy oxygen immediately in response to depressurization, smoke, or other urgent needs, without waiting for an automatic trigger. Automatic activation, driven by a cabin altitude sensor, occurs only when the cabin pressure or altitude threshold is reached, not on demand. The crew door interlock and the passenger call button do not initiate the oxygen system.

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