At what altitude are quick-donning masks required in aviation?

Quick-donning masks are required at an altitude of 25,000 feet in aviation to ensure pilot safety and effective response to cabin depressurization. The rationale behind this requirement is based on the need to provide supplemental oxygen to pilots as they climb above this altitude, where the partial pressure of oxygen decreases and can lead to hypoxia if not managed appropriately.

At 25,000 feet, the likelihood of experiencing hypoxic conditions increases, making it essential for pilots to have immediate access to oxygen. Quick-donning masks are designed for rapid deployment to ensure pilots can quickly put on the mask in an emergency situation, minimizing the time they could be exposed to inadequate oxygen levels. The requirement at this altitude reflects regulatory safety standards aimed at maintaining crew performance and mitigating risks associated with high-altitude flight operations.

Other altitudes listed, while relevant to oxygen requirements, do not mandate the same urgent need for quick-donning masks as established for 25,000 feet. This makes the 25,000-foot threshold significant for ensuring pilot readiness and safety.