What is the minimum oxygen pressure required for dispatch with two cockpit crewmembers?

The minimum oxygen pressure required for dispatch with two cockpit crewmembers is established to ensure that there is sufficient oxygen available for both pilots to breathe in case of cabin depressurization. The requirement for 807 psi reflects the regulatory and safety standards set for commercial aviation. This pressure ensures that both crewmembers have an adequate supply of oxygen for emergency situations, considering the duration and altitude at which the aircraft operates.

In the context of the CRJ550, maintaining a pressure above this threshold provides a critical margin for safety, as it allows for the provision of supplemental oxygen if necessary during flight operations. While the other pressure levels may represent varying capacities of oxygen systems, they do not meet the specific requirement needed to ensure the safety and wellbeing of both pilots in the event of an emergency.