A position sensor for a bleed valve with a piston, a valve disc, and a piston linkage to couple the piston and the valve disc, the position sensor includes a coil, and a core assembly, including a core disposed within the coil, a link retainer coupled to the piston, and a connecting rod coupled to the core and the link retainer.

A system includes a concentration sensor, a flow sensor, and a controller. The concentration sensor is configured to measure a concentration of a contaminant in a cabin of an aircraft. The flow sensor is configured to measure a flow rate of air into the cabin. The controller is configured to determine whether a concentration measurement of the contaminant in the cabin exceeds a first concentration threshold. The controller is configured to, in response to determining that the concentration measurement does not exceed the first concentration threshold, control the flow rate of air into the cabin based on a flow rate setpoint. The controller is configured to, in response to determining that the concentration measurement exceeds the first concentration threshold, control the flow rate of air into the cabin based on a flow rate setpoint and a correction factor that is based on a flow sensor tolerance.

A system includes a concentration sensor, a flow sensor, and a controller. The concentration sensor is configured to measure a concentration of a contaminant in a cabin of an aircraft. The flow sensor is configured to measure a flow rate of air into the cabin. The controller is configured to determine whether a concentration measurement of the contaminant in the cabin exceeds a first concentration threshold. The controller is configured to, in response to determining that the concentration measurement does not exceed the first concentration threshold, control the flow rate of air into the cabin based on a flow rate setpoint. The controller is configured to, in response to determining that the concentration measurement exceeds the first concentration threshold, control the flow rate of air into the cabin based on a flow rate setpoint and a correction factor that is based on a flow sensor tolerance.

A ram air module for use in a ram air system, the ram air module includes a diffuser having a diffuser body including an inlet end and an outlet end, a flow diverter assembly connected to the inlet end of the diffuser body, and a valve connected to the outlet end of the diffuser body.

An airflow control system includes a valve including a valve disk rotatable within a flow control duct and a valve actuator connected to the valve disk. The valve actuator is operable to adjust a position the valve disk. A pneumatic controller is configured to regulate a pressure within the flow control duct downstream of the valve disk by adjusting the position of the valve disk when the pressure within the flow control duct downstream of the valve disk exceeds a regulation pressure set point. A torque motor is fluidly connected to the valve actuator and a digital controller is operably coupled to the torque motor. The digital controller is configured to regulate the pressure within the flow control duct downstream of the valve disk independently from the pneumatic controller.

An airflow control system includes a valve including a valve disk rotatable within a flow control duct and a valve actuator connected to the valve disk. The valve actuator is operable to adjust a position the valve disk. A pneumatic controller is configured to regulate a pressure within the flow control duct downstream of the valve disk by adjusting the position of the valve disk when the pressure within the flow control duct downstream of the valve disk exceeds a regulation pressure set point. A torque motor is fluidly connected to the valve actuator and a digital controller is operably coupled to the torque motor. The digital controller is configured to regulate the pressure within the flow control duct downstream of the valve disk independently from the pneumatic controller.

Systems and methods for limiting infiltration of cabin air into the flight deck of an aircraft, where the systems include at least one upper nozzle disposed adjacent to and above an outer upper edge of a flight deck doorway and directed downwardly, and at least one lower nozzle disposed adjacent to and below an outer lower edge of the flight deck doorway and directed upwardly; a conduit system to deliver air from a flight deck air supply to the upper and lower nozzles; and an airflow controller configured to provide sufficient air flow from the flight deck air supply to the upper and lower nozzles to create directional airstreams across the gaps between the closed flight deck door and the upper and lower edges of the flight deck doorway, so that the airstreams limit infiltration of cabin air into the flight deck via the gaps.

Systems and methods for limiting infiltration of cabin air into the flight deck of an aircraft, where the systems include at least one upper nozzle disposed adjacent to and above an outer upper edge of a flight deck doorway and directed downwardly, and at least one lower nozzle disposed adjacent to and below an outer lower edge of the flight deck doorway and directed upwardly; a conduit system to deliver air from a flight deck air supply to the upper and lower nozzles; and an airflow controller configured to provide sufficient air flow from the flight deck air supply to the upper and lower nozzles to create directional airstreams across the gaps between the closed flight deck door and the upper and lower edges of the flight deck doorway, so that the airstreams limit infiltration of cabin air into the flight deck via the gaps.

A servo valve for an actuator is described. The servo valve comprises a housing having a plurality of ports, a sleeve disposed within the housing, the sleeve comprising an axis (A), an inner surface defining a cavity for the servo valve and a plurality of metering holes, each in communication with one of the ports, and a metering rod extending axially in the cavity for reciprocation along the axis to meter flow through the metering holes. The servo valve additionally comprises a first spring seal extending between the metering rod and the sleeve to close off a first end of the cavity and a second spring seal extending between the metering rod and the sleeve to close off a second, opposite end of the cavity.

A servo valve for an actuator is described. The servo valve comprises a housing having a plurality of ports, a sleeve disposed within the housing, the sleeve comprising an axis (A), an inner surface defining a cavity for the servo valve and a plurality of metering holes, each in communication with one of the ports, and a metering rod extending axially in the cavity for reciprocation along the axis to meter flow through the metering holes. The servo valve additionally comprises a first spring seal extending between the metering rod and the sleeve to close off a first end of the cavity and a second spring seal extending between the metering rod and the sleeve to close off a second, opposite end of the cavity.