An emergency oxygen system for aircraft comprising: a breathing gas supply circuit to be connected upstream to a source of breathing gas and downstream to at least one mask, a flow control valve configured to adjust the flow of breathing gas supplied to the mask, an electronics board configured to control the flow control valve, a power source, a switching device interposed between the power source and the electronics board, the switching device comprising a switch configured to have a first state in which power from the power source is supplied to the electronics board and a second state in which the electronics board is not supplied with power from the power source.

An emergency oxygen system for aircraft comprising: a breathing gas supply circuit to be connected upstream to a source of breathing gas and downstream to at least one mask, a flow control valve configured to adjust the flow of breathing gas supplied to the mask, an electronics board configured to control the flow control valve, a power source, a switching device interposed between the power source and the electronics board, the switching device comprising a switch configured to have a first state in which power from the power source is supplied to the electronics board and a second state in which the electronics board is not supplied with power from the power source.

Described herein are a system for providing oxygen to oxygen masks in an aircraft, and an associated method for regulating the oxygen flow in an efficient manner. The system has an oxygen tank, oxygen masks, first and second oxygen lines, and an electrically controllable valve. The valve is coupled to the oxygen tank and the two oxygen lines. The oxygen masks are coupled to the oxygen lines downstream of the valve to accommodate the transfer of oxygen from the oxygen tank via the valve. In a working state when an electrical signal is applied the valve produces a connection between the oxygen tank and the first oxygen line when required, and permanently prevents a connection between the oxygen tank and the second oxygen line. When in a rest state, the valve produces a permanent connection between the oxygen tank and the second oxygen line.

Described herein are a system for providing oxygen to oxygen masks in an aircraft, and an associated method for regulating the oxygen flow in an efficient manner. The system has an oxygen tank, oxygen masks, first and second oxygen lines, and an electrically controllable valve. The valve is coupled to the oxygen tank and the two oxygen lines. The oxygen masks are coupled to the oxygen lines downstream of the valve to accommodate the transfer of oxygen from the oxygen tank via the valve. In a working state when an electrical signal is applied the valve produces a connection between the oxygen tank and the first oxygen line when required, and permanently prevents a connection between the oxygen tank and the second oxygen line. When in a rest state, the valve produces a permanent connection between the oxygen tank and the second oxygen line.

An aspect of the present disclosure is a G-tolerance improving device including a valve control unit configured to control an operation of a main system valve configured to control pressure of oxygen to be supplied to a user who is breathing with positive pressure applied to his or her airway, the oxygen from a main supply source configured to supply the oxygen to the user, and an operation of an auxiliary system valve configured to control pressure of an auxiliary gas to be supplied to the user, the auxiliary gas from an auxiliary supply source configured to supply, to the user, the auxiliary gas including highly concentrated oxygen that is oxygen at a higher concentration than the oxygen supplied from the main supply source, in which, when a breathing state of the user changes from an exhalation phase to an inhalation phase, the valve control unit controls an operation of the main system valve and the auxiliary system valve such that the auxiliary gas is supplied to the user for a predetermined time that is shorter than a time of the inhalation phase.

An aspect of the present disclosure is a G-tolerance improving device including a valve control unit configured to control an operation of a main system valve configured to control pressure of oxygen to be supplied to a user who is breathing with positive pressure applied to his or her airway, the oxygen from a main supply source configured to supply the oxygen to the user, and an operation of an auxiliary system valve configured to control pressure of an auxiliary gas to be supplied to the user, the auxiliary gas from an auxiliary supply source configured to supply, to the user, the auxiliary gas including highly concentrated oxygen that is oxygen at a higher concentration than the oxygen supplied from the main supply source, in which, when a breathing state of the user changes from an exhalation phase to an inhalation phase, the valve control unit controls an operation of the main system valve and the auxiliary system valve such that the auxiliary gas is supplied to the user for a predetermined time that is shorter than a time of the inhalation phase.

An oxygen mask for use in an aircraft includes a base, the base having an oxygen port for an inflow of oxygen from an oxygen source; a face piece, protruding from a peripheral portion of the base and surrounding a breathing space; a re-directing portion, spaced from the base and arranged over the oxygen port within the breathing space; and at least one lateral opening between the base and the re-directing portion, the at least one lateral opening providing a fluid connection between the oxygen port and the breathing space.

A respiratory equipment for an aircraft, a pilot or first officer of the aircraft forming a user of the respiratory equipment, the respiratory equipment comprising a head armature, configured to be worn on the user's head, a respiratory mask configured to be applied, in a use position around the mouth and nose of a user, an inflatable harness configured to be coupled to a pressurized gas source, an inflation of the inflatable harness causing an extension of the inflatable harness such that the respiratory mask can be brought opposite the mouth and nose of a user, and a purge of the inflatable harness causing a constrained application of the inflatable harness against the mouth and nose of a user, wherein the head armature comprises at least an occipital member, and a front cradle for receiving and lodging the respiratory mask in a waiting position, wherein the inflatable harness is fixed to the occipital member and the inflatable harness is coupled to the respiratory mask.

An onboard rebreathing loop system resident on an aircraft for providing oxygen to aircraft personnel includes a ceramic oxygen generating system (COGS) module configured to receive an inlet air and output a high purity oxygen (O.sub.2) gas into a breathing loop and a carbon dioxide (CO.sub.2) scrubber module configured to receive exhaled air from the aircraft personnel and output a CO.sub.2-scrubbed air into the breathing loop. The high purity O.sub.2 gas and CO.sub.2-scrubbed air are mixed to form a mixed gas having a partial pressure of O.sub.2 suitable for breathing by the aircraft personnel. The onboard rebreathing loop system may further include an odor removal module, an air temperature and/or humidity control module to condition the mixed gas before breathing by the aircraft personnel, and a gas sensor module to confirm the partial pressure of O.sub.2 within the mixed gas before breathing by the aircraft personnel.

An onboard rebreathing loop system resident on an aircraft for providing oxygen to aircraft personnel includes a ceramic oxygen generating system (COGS) module configured to receive an inlet air and output a high purity oxygen (O.sub.2) gas into a breathing loop and a carbon dioxide (CO.sub.2) scrubber module configured to receive exhaled air from the aircraft personnel and output a CO.sub.2-scrubbed air into the breathing loop. The high purity O.sub.2 gas and CO.sub.2-scrubbed air are mixed to form a mixed gas having a partial pressure of O.sub.2 suitable for breathing by the aircraft personnel. The onboard rebreathing loop system may further include an odor removal module, an air temperature and/or humidity control module to condition the mixed gas before breathing by the aircraft personnel, and a gas sensor module to confirm the partial pressure of O.sub.2 within the mixed gas before breathing by the aircraft personnel.