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

The required oxygen pressure for dispatch with three cockpit crewmembers on the CRJ550 is established to ensure that there is sufficient oxygen for all crew members in case of a cabin depressurization at high altitudes. In practice, having a higher oxygen pressure helps accommodate the needs of additional crew since they all rely on the oxygen system during emergencies.

For aircraft systems, 1107 psi is the specified threshold that guarantees an adequate supply of oxygen, ensuring safety and compliance with regulatory requirements for multiple crew members in the cockpit. This pressure is critical in maintaining operational readiness, as it takes into account potential oxygen loss scenarios during flight and ensures all crewmembers have access to necessary resources.

Other values, while possibly within the operational limits, do not meet the requirements for dispatch for three cockpit crewmembers, thus they would not be suitable for ensuring proper safety margins during flights.