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

• A. 807 psi
• B. 1107 psi
• C. 607 psi
• D. 1000 psi

Answer: (A)

The key idea is how much oxygen two cockpit crewmembers need and how long that supply must last during dispatch. The minimum oxygen pressure is set by the cylinder’s capacity and the flow rate delivering oxygen to both crewmembers for the required duration. For two crew, the regulator and the assumed consumption rate are such that about 807 psi still provides a safe, adequate supply for the mandated period. Pressures higher than that give extra margin, but the question asks for the minimum that still meets the dispatch requirement. Pressures well below 807 psi would not guarantee enough oxygen for the needed time, and values above 807 psi aren’t the minimum. So 807 psi is the correct minimum.