Auto drops masks at what altitude?

Auto drops masks at what altitude?

• A. 14,000 +/- 300 ft
• B. 14,500 +/- 500 ft
• C. 13,500 +/- 400 ft
• D. 15,000 +/- 100 ft

Answer: (A)

Automatic oxygen mask deployment is triggered by cabin altitude, not the aircraft’s external altitude. The system is designed to release masks when the cabin altitude reaches about 14,000 feet, so passengers start receiving oxygen before hypoxia becomes a risk during depressurization or ascent. The tolerance of ±300 feet means the deployment happens roughly between 13,700 and 14,300 feet, which matches standard certification specifications. Other options fall outside this typical trigger window, so they don’t align with how the system is designed to operate.

Automatic oxygen mask deployment is triggered by cabin altitude, not the aircraft’s external altitude. The system is designed to release masks when the cabin altitude reaches about 14,000 feet, so passengers start receiving oxygen before hypoxia becomes a risk during depressurization or ascent.

The tolerance of ±300 feet means the deployment happens roughly between 13,700 and 14,300 feet, which matches standard certification specifications. Other options fall outside this typical trigger window, so they don’t align with how the system is designed to operate.