System for regulating the dispensing of commercial aircraft passenger oxygen supply

An emergency oxygen supply system for an aircraft with a pressurizable passenger cabin comprising:

• first and second sources of supplemental breathable oxygen;
• a first on-off inlet valve connected via a first conduit to said first source of supplemental breathable oxygen and not connected to the second source of supplemental breathable oxygen, and a second on-off inlet valve connected via a second conduit to said second source of supplemental breathable oxygen and not connected to the first source of supplemental breathable oxygen, where the first conduit and second conduit are separate;
• at least one cabin air pressure transducer for generating a cabin air pressure input signal representing the cabin pressure and a corresponding altitude;
• at least one first breathing device configured to receive supplemental breathable oxygen from the first source of supplemental breathable oxygen and not from the second source of supplemental breathable oxygen, and at least one second breathing device configured to receive supplemental breathable oxygen from the second source of supplemental breathable oxygen and not from the first source of supplemental breathable oxygen;
• a first manifold connected between said first on-off inlet valve and said at least one first breathing device, and a second manifold connected between said second on-off inlet valve and said second at least one breathing device;
• and
• a pressure controller connected to said at least one cabin air pressure transducer for receiving said cabin air pressure input signal, said pressure controller being connected to and controlling the operation of said first and second on-off inlet valves by transmitting a single control signal to each of the first on-off inlet valve and the second on-off inlet valve based on said cabin air pressure input signal received from said at least one cabin air pressure transducer.