Which mechanisms can signal the oxygen mask container doors to open?

Which mechanisms can signal the oxygen mask container doors to open?

• A. Automatic system or Manual ON pushbutton
• B. Manual Release Tool
• C. Manual Mask On pushbutton
• D. The flight crew

Answer: (A)

Oxygen mask container doors are opened only when the emergency oxygen system is commanded to deploy. This can happen automatically, based on a cabin altitude/pressurization signal, or manually when the crew presses the Manual ON pushbutton in the cockpit. The Manual Release Tool is a maintenance tool and not used for in-flight deployment. The Manual Mask On pushbutton does not directly signal the doors to open; it relates to starting oxygen flow, while door deployment is triggered either automatically or by the Manual ON pushbutton.

Oxygen mask container doors are opened only when the emergency oxygen system is commanded to deploy. This can happen automatically, based on a cabin altitude/pressurization signal, or manually when the crew presses the Manual ON pushbutton in the cockpit. The Manual Release Tool is a maintenance tool and not used for in-flight deployment. The Manual Mask On pushbutton does not directly signal the doors to open; it relates to starting oxygen flow, while door deployment is triggered either automatically or by the Manual ON pushbutton.