B787 Emergency Oxygen lasts for how long?

B787 Emergency Oxygen lasts for how long?

• A. 30 Minutes
• B. 45 Minutes
• C. 60 Minutes
• D. 90 Minutes

Answer: (C)

Emergency oxygen duration is about how long the supply lasts after it’s deployed. For the Boeing 787, the system is designed so passenger masks provide oxygen for about 60 minutes. This 60-minute duration gives passengers and crew enough time to safely descend from cruise altitude to a breathable level while the oxygen is still flowing. The choice of 60 minutes reflects the certification and the capacity of the oxygen generators used in the 787, balancing safety with weight and system complexity. Shorter durations like 30 or 45 minutes wouldn’t reliably cover the descent and potential delays, while a much longer duration would add unnecessary weight. So, the 60-minute figure best matches the aircraft’s design and safety requirements.

Emergency oxygen duration is about how long the supply lasts after it’s deployed. For the Boeing 787, the system is designed so passenger masks provide oxygen for about 60 minutes. This 60-minute duration gives passengers and crew enough time to safely descend from cruise altitude to a breathable level while the oxygen is still flowing. The choice of 60 minutes reflects the certification and the capacity of the oxygen generators used in the 787, balancing safety with weight and system complexity. Shorter durations like 30 or 45 minutes wouldn’t reliably cover the descent and potential delays, while a much longer duration would add unnecessary weight. So, the 60-minute figure best matches the aircraft’s design and safety requirements.