What is the TUC at 25,000 feet?

The correct answer is that the Time of Useful Consciousness (TUC) at 25,000 feet is approximately 1 minute. The TUC refers to the period during which a person can maintain consciousness and perform complex tasks after a rapid decompression or loss of cabin pressure in an aircraft.

At altitudes of around 25,000 feet, the partial pressure of oxygen decreases significantly, leading to a reduced supply of oxygen to the brain and body. This reduction can impair cognitive and motor functions. At this altitude, individuals have enough time initially to recognize the emergency, apply oxygen masks if available, and take corrective actions before progressive hypoxia sets in.

Knowledge of TUC is crucial for flight crews and passengers, as it emphasizes the importance of the availability of supplemental oxygen and prompt action if cabin pressure is lost. This understanding is vital for safety protocols, especially during low-altitude or high-altitude emergencies.