What is the TUC for 22,000 feet?

What is the TUC for 22,000 feet?

• A. 10 minutes
• B. 20-30 minutes
• C. 3-5 minutes
• D. 1-2 minutes

Answer: (A)

Time of Useful Consciousness is the window after a rapid depressurization during which you still have enough awareness to take action and use your oxygen to descend safely. At 22,000 feet, this window is about 10 minutes. That duration reflects how oxygen pressure in the blood declines with altitude: you’re able to think and function for a while, but the clock is ticking as hypoxia progresses. The idea in training is that you have roughly a ten-minute window to don oxygen and initiate descent or reach a pressurized/oxygen-equipped environment. The other durations don’t fit typical TUC expectations for this altitude: much longer times would imply you could function well without oxygen for far too long, and much shorter times would understate the usable period for this specific altitude. Real-world variation exists, but 10 minutes is the standard teaching value for 22,000 feet.

Time of Useful Consciousness is the window after a rapid depressurization during which you still have enough awareness to take action and use your oxygen to descend safely. At 22,000 feet, this window is about 10 minutes. That duration reflects how oxygen pressure in the blood declines with altitude: you’re able to think and function for a while, but the clock is ticking as hypoxia progresses. The idea in training is that you have roughly a ten-minute window to don oxygen and initiate descent or reach a pressurized/oxygen-equipped environment.

The other durations don’t fit typical TUC expectations for this altitude: much longer times would imply you could function well without oxygen for far too long, and much shorter times would understate the usable period for this specific altitude. Real-world variation exists, but 10 minutes is the standard teaching value for 22,000 feet.