For how long can an aircraft be flown above 10,000 feet ASL without oxygen available?

When flying above 10,000 feet Above Sea Level (ASL), the regulations set forth by Transport Canada specify the requirement for supplemental oxygen for pilots and passengers. Specifically, the limit for flying without supplemental oxygen is set at a maximum duration of 30 minutes. Once an aircraft reaches higher altitudes, the partial pressure of oxygen decreases, leading to the risk of hypoxia for unprotected individuals.

This regulation is in place to ensure safety and to mitigate the effects of altitude on human physiology, which can impair the ability to perform tasks effectively. The decision to allow 30 minutes of flight time without oxygen reflects a balance between operational flexibility and safety considerations, acknowledging that pilots may need to climb to altitude for a short duration without the immediate availability of supplemental oxygen.

Understanding this limitation is crucial for pilots to maintain proper awareness of their responsibilities regarding passenger safety and physiology at high altitudes. Ensuring compliance with this regulation protects against the serious risks associated with hypoxia and helps pilots make informed decisions regarding altitude and oxygen use during flight.