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

• A. 1107 psi
• B. 807 psi
• C. 1300 psi
• D. 1000 psi

Answer: (A)

The question tests how oxygen system capacity is matched to the number of crew and the duration of the required supply. With three cockpit crewmembers, the system must deliver oxygen to all three simultaneously for the defined dispatch time, so the minimum acceptable cylinder pressure is higher to guarantee that supply.

The value around 1,100 psi (specifically 1,107 psi in this case) reflects that shared demand and margin. It ensures there is enough gas left to feed all three regulators for the required duration, even as the pressure in the cylinder drops. Lower pressures wouldn’t reliably provide oxygen to all three for the full dispatch period, while higher pressures exceed what the published minimum requires. That’s why this specific figure is the correct standard for three crew.