Oxygen supply system and method for providing an adequate oxygen supply mode in an aircraft

A method for providing an adequate oxygen supply mode in an aircraft, the aircraft comprising an oxygen supply system having a preventive oxygen supply system comprising an oxygen source;

• a preventive oxygen dispensing unit being connectable to the oxygen source;
• a cabin altitude detection device;
• and a preventive oxygen control device, wherein the preventive oxygen control device is switchable between at least the following modes:
• a pre-wear mode for providing no oxygen of the oxygen source to the preventive oxygen dispensing unit but normal cabin air;
• a pre-oxygenation mode for providing a predetermined rate of oxygen of the oxygen source to the preventive oxygen dispensing unit being sufficient for generating a pre-oxygenation condition of a user;
• and
• a decompression mode for providing high concentrated oxygen of the oxygen source to the preventive oxygen dispensing unit being sufficient for ensuring a minimum oxygenation of the user;
• wherein the preventive oxygen control device is automatically switched to the decompression mode in case a predetermined cabin altitude threshold is detected by the cabin altitude detection device.

An aircraft comprising an oxygen supply system for providing an adequate oxygen supply mode in the aircraft, the oxygen supply system having a preventive oxygen supply system comprising:

• an oxygen source;
• a preventive oxygen dispensing unit being connectable to the oxygen source;
• a cabin altitude detection device;
• and
• a preventive oxygen control device being adapted to provide at least the following modes:
• a pre-wear mode for providing no oxygen of the oxygen source to the preventive oxygen dispensing unit but normal cabin air;
• a pre-oxygenation mode for providing a predetermined rate of oxygen of the oxygen source to the preventive oxygen dispensing unit being sufficient for generating a pre-oxygenation condition of the user;
• and
• a decompression mode for providing high concentrated oxygen of the oxygen source to the preventive oxygen dispensing unit being sufficient for ensuring a minimum oxygenation of the user;
• the preventive oxygen control device automatically switching to the decompression mode in case a predetermined cabin altitude threshold is detected by the cabin altitude detection device.