What is the maximum crew oxygen supply time at 100% concentration?

The maximum crew oxygen supply time at 100% concentration is 22 minutes. This duration is critical for ensuring that the crew has sufficient oxygen available in emergencies, such as during rapid decompression or in situations where cabin pressurization is compromised. The 22-minute supply time is based on the capacity of the oxygen system designed for the Embraer Regional Jet, as it takes into account not only the volume of the oxygen stored but also the consumption rates at altitude and during emergency situations.

Understanding this value is essential for flight safety and crew readiness, as it allows pilots to make informed decisions when managing cabin pressure events. A shorter or longer duration would affect crew performance and decision-making capabilities during critical phases of flight. Therefore, having a defined and reliable oxygen supply time ensures that the crew is prepared for possible emergencies that may arise during flight operations.