The EMER DEPRESS Switch is prohibited above what altitude?

• A. 5,000 ft
• B. 10,000 ft
• C. 15,000 ft
• D. 20,000 ft

Answer: (C)

This question is about safety limits for using an emergency depressurization feature. The system is designed to be pressed into service at lower altitudes where occupants can still handle a rapid pressure change and oxygen is readily available through supplemental sources if needed. Above 15,000 ft, venting the cabin suddenly would quickly deprive everyone of breathable air, risking rapid hypoxia and making it difficult for the crew to respond. Certification and operating procedures place this altitude limit to ensure the action can be used safely, so the switch is restricted beyond 15,000 ft.