A control system for an onboard oxygen generating system (OBOGS) includes a gain control communicatively coupled to an oxygen sensor configured to measure an oxygen concentration outputted from the OBOGS. The gain control selectively switches between unbalanced and balanced bed cycling modes of the OBOGS to produce a target oxygen concentration based on demand. A corresponding method includes providing a gain control communicatively coupled to an oxygen sensor configured to measure an oxygen concentration outputted from the OBOGS, controlling the OBOGS to operate in the unbalanced bed cycling mode when a low demand is placed on the OBOGS whereby the gain control provides a short bed cycle and a corresponding long cycle of a fixed cycle time, and switching the OBOGS to operate in the balanced bed cycling mode when a high demand is placed on the OBOGS. The balanced bed cycling mode operates at a decreased bed cycle time.

Disclosed is a Sabatier reactor apparatus including a carbon sorbent bed having an inlet for introducing a reactant stream to the carbon sorbent bed and an outlet for exiting a treated reactant stream from the carbon sorbent bed; and a Sabatier reactor having an inlet for introducing the treated reactant stream to the Sabatier reactor and an outlet for removing a product stream from the Sabatier reactor. Also disclosed is a method of preparing a reactant stream for a Sabatier reactor.

An air separation module includes a canister extending between a first end and an opposite second end, a separator fixed within the canister to separate a compressed air flow into an oxygen-enriched air flow fraction and an oxygen-depleted air flow fraction, and a one-piece cap. The one-piece cap is connected to the first end of the canister and has a filter module mount portion on a side of the one-piece cap opposite the separator to support a filter module with the air separation module. Nitrogen generation systems and methods of making air separation modules are also described.

Some embodiments of the present disclosure are directed to an antenna system for an airplane. The antenna system including an antenna system enclosure and a desiccant enclosure within the antenna system enclosure and having desiccant material positioned between an outside air pipe and an inside air pipe, the inside air pipe extending from the desiccant enclosure to open to an interior air volume of at least one component of the antenna system within the antenna system enclosure, the outside air pipe extending from the desiccant enclosure to ambient air outside the antenna system enclosure, and the desiccant material is configured to absorb moisture in the ambient air flowing from the outside air pipe to the inside air pipe through the desiccant enclosure while air pressure is being equalized from outside to inside the antenna system enclosure.

An ozone converter includes an outer housing having an inlet and an outlet, a first channel disposed between the inlet and the outlet, and a bypass channel disposed between the inlet and the outlet and separated from first channel. The converter also includes a core disposed within the first channel and a bypass control mechanism that includes one more blocking elements that causes inlet air to pass through the first channel or the bypass channel based on an altitude of the ozone converter. The control mechanism includes a piston that moves between at least a first position and a second position and a bellows that controls a flow a pressurized air to the piston.

An environmental control system includes an air conditioning subsystem and a contaminant removal subsystem downstream of the environment to be conditioned. The contaminant removal subsystem includes: a first gas-liquid contactor-separator; a second gas-liquid contactor-separator; and a dehumidifier disposed either upstream of the first gas-liquid contactor-separator or downstream of the second gas-liquid contactor-separator.

Disclosed are embodiments of a cabin filter system including a sorbent material for removing gas and/or water from a cabin. The filter system also includes at least one heater configured to transmit thermal energy (e.g., microwave energy) to the sorbent material. Also disclosed are methods of using such filter systems.

An aircraft environmental control system includes means for mixing and conditioning bleed air from a bleed air input and recirculation air from an aircraft interior to provide mixed, conditioned air to the aircraft interior. The system also includes a first contaminant removal device and a second contaminant removal device arranged in a path of at least part of the recirculation air, prior to the means for mixing and conditioning, and a valve (SV1) arranged to alternate flow of recirculation air through the first and second contaminant removal devices.

A monolithic open cell structure apparatus including an open cell structure housing including a first side, a second side opposite the first side, a first opening located at the first side, and a second opening located opposite the first opening at a second side. The monolithic open cell structure apparatus also including a filtration portion extending from the first side to the second side within the open cell structure housing. The monolithic open cell structure apparatus further including a retaining partition that at least partially encloses the filtration portion within the open cell structure housing. The monolithic open cell structure apparatus is a single piece including a unitary structure.

Disclosed is a method for disinfecting and cleaning to prevent contamination of a passenger vehicle, characterized in that it includes the following operations: —installing at least one filter and condenser in the ventilation circuit; creating a swirling vortex of a disinfectant liquid by a gas referred to as a driving gas; spraying the swirling mixture created onto the clothing and luggage of passengers before they enter the passenger compartment; and spraying the mixture created onto the solid surfaces and/or into the air of the passenger compartment to be disinfected. Also disclosed is a device for implementing the method.