Which statement about the 787 oxygen system is true?

Which statement about the 787 oxygen system is true?

• A. The Cabin Oxygen Lasts 22 Minutes
• B. The Cabin Oxygen Lasts 10 Minutes
• C. The Cabin Oxygen Lasts 30 Minutes
• D. The Cabin Oxygen Lasts 60 Minutes

Answer: (A)

The statement tests how long the cabin oxygen supply remains available after depressurization. The 787 uses an electric oxygen generation system that continuously produces oxygen for passengers once masks deploy. This system is designed to provide breathable oxygen for about 22 minutes, long enough for the aircraft to descend to a safe cabin altitude and for the crew to manage the emergency. Therefore, the 22-minute duration matches the aircraft’s design and certification, making it the correct choice. The other durations (10, 30, or 60 minutes) do not align with the 787’s oxygen system specifications.

The statement tests how long the cabin oxygen supply remains available after depressurization. The 787 uses an electric oxygen generation system that continuously produces oxygen for passengers once masks deploy. This system is designed to provide breathable oxygen for about 22 minutes, long enough for the aircraft to descend to a safe cabin altitude and for the crew to manage the emergency. Therefore, the 22-minute duration matches the aircraft’s design and certification, making it the correct choice. The other durations (10, 30, or 60 minutes) do not align with the 787’s oxygen system specifications.