Supplemental oxygen masks actuated by the flight deck or automatically at cabin altitude 14,000 +/- 500 feet is correct.

• A. True
• B. False
• C. Not applicable
• D. Cannot determine

Answer: (A)

Oxygen mask deployment is timed to protect people from hypoxia as cabin pressure is lost. The system is designed so that masks either drop or are activated automatically when cabin altitude reaches about 14,000 feet, with a tolerance of roughly plus or minus 500 feet. This automatic trigger ensures occupants get oxygen within seconds of depressurization, even if no one is able to respond immediately. In addition, the flight deck provides a manual option to actuate the oxygen system, allowing the crew to deploy their masks and supply oxygen as needed during emergencies. So the statement that masks are actuated by the flight deck or automatically at cabin altitude 14,000 +/- 500 feet aligns with how the oxygen system is intended to operate.