Abstract: A fault detection circuit includes a system controller and a fault detection controller. The system controller includes at least one memory device to control at least one electrical system. The fault detection controller communicates with the system controller to detect at least one fault of the system controller and to control operation of the system controller based on comparison between a frequency of detected faults corresponding to the system controller and at least one frequency threshold value.

Abstract: A linear actuator comprises an actuator housing defining a bore. A drive element is received in the actuator housing bore. The drive element comprises tubular portions receiving first and second ball nuts arranged at respective distal ends thereof. The ball nuts are threaded in opposite directions to one another. The drive element further comprises a drive coupling. The actuator further comprises first and second ball screws operatively engaged with the first and second ball nuts. Rotation of the drive element and thus the ball nuts relative to said ball screws causes the ball screws to move together in a linear path in opposite directions from one another.

Abstract: A plug for sealing a passage extending about a longitudinal axis (A) comprises a shell having a circumferential wall extending between an end wall and an opening, and an internal cavity extending axially within the shell, and an expander having a head and a shank extending axially from the head, the head retained with the cavity and the shank extending axially through the opening of the cavity, wherein the circumferential wall comprises an inner surface having at least a first region and a second region, the second region proximate the opening and the first region adjacent to the second region and extending therefrom towards the end wall, the inner surface in the first region tapering inwardly relative to the longitudinal axis (A) to provide a first angled ramp, and the inner surface in the second region tapering further inwardly to provide a second angled ramp.

Abstract: Provided are embodiments including a system and method for operating a reconfigurable control architecture for programmable logic devices. Some embodiments include a storage medium that is coupled to a programmable logic device and a dispatch mechanism that is operably coupled to the programmable logic device. In embodiments, the dispatch mechanism is configured is receive an object, select one or more constructs of the programmable logic device based on the object, schedule one or more inputs and outputs for each of the selected constructs based on the object, and execute a system level operation indicated by the object based on the schedule.

Abstract: According to one embodiment, a ram air fan inlet shroud for a ram air fan assembly of an aircraft is provided. The ram air fan inlet shroud including: a shroud portion extending outwardly from a conical portion, the conical portion providing a transition between a central portion and an inner ram air fan hub interface portion, the conical portion including a plurality of inner cooling holes, a diameter of each of the plurality of inner cooling holes is about 0.406 inches (1.031 cm); and a recessed portion located between the inner ram air fan hub interface portion and an outer ram air fan hub interface portion, the recessed portion including a plurality of outer cooling holes.

Abstract: A system for controlling a motor driven compressor (MDC) is provided. The system includes a sensing element and a controller coupled to the sensing element. The controller is configured to determine whether an actual speed of the MDC sensed by the sensing element is below a predicted minimum speed, shut down and then restart the MDC and detect if the restart of the MDC is successful.

Abstract: A pneumatic controller includes a manifold, a selector, and a biasing member. The manifold has a low pressure port, a high pressure port, an actuator port, and a vent. The selector is movable within the manifold between a first position and a second position, the low pressure port in fluid communication with the actuator port in the first position, the high pressure port in fluid communication with the actuator port in the second position. The biasing member is supported within the manifold and urges the selector towards the first position, wherein the low pressure port is in fluid communication with the vent in both the first position and the second position to cool the biasing member with low pressure fluid received at the low pressure port. Inline valves, gas turbine engines, and methods of controlling fluid flow through inline valves are also described.

Abstract: Disclosed is a corrosion inhibition coating, comprising: a base comprising a matrix and a metal within the matrix; and an inhibitor comprising: zinc molybdate, cerium citrate, magnesium metasilicate, a metal phosphate silicate, or a combination thereof, wherein the metal within the matrix comprises aluminum, an aluminum alloy, zinc, a zinc alloy, magnesium, a magnesium alloy, or a combination thereof. Also disclosed is a substrate coated with the corrosion inhibition coating.

Abstract: An inline valve includes a valve body, a valve member, and a control manifold. The valve body has an exterior, an inlet, and an outlet. The valve member is supported within the valve body and is movable between a first position and a second position. The inlet in fluid communication with the outlet while the valve member is in the first position and the inlet fluidly separated from the outlet while the valve member is in the second position. The control manifold is supported by the valve body, has a reference fluid port and a control fluid port, and is in pneumatic communication with the valve member through the valve body exterior to passive movement of the valve member according to pressure at the valve body inlet. Gas turbine engines and methods of controlling valves are described.

Abstract: A single-unit nose cone for a ram air including: a dome portion located at a forward end of the single unit nose cone; a dome stand portion adjacent to the dome portion; a seat portion adjacent to the dome stand portion; and a stem portion adjacent to the seat portion and located at an aft end of the single-unit nose cone, wherein the dome portion, the dome stand portion, the seat portion, and the stem portion are composed from a single piece of material having a density of about 0.286 pound/cubic inch (7916 kilogram/cubic meter).

Abstract: A pneumatic controller for an inline valve includes a manifold with a set screw seated within it, a selector, and a biasing member. The manifold has a low pressure port, a high pressure port, and an actuator port. The selector is movable within the manifold between a first position and a second position, the low pressure port in fluid communication with the actuator port in the first position, the high pressure port in fluid communication with the actuator port in the second position. The biasing member urges the selector towards the first position with a biasing force and is spaced apart from the selector to limit eccentric force exerted on the selector. Inline valves and methods of controlling fluid flow through inline valves are also described.

Abstract: A compound harmonic drive including: a first internal ring gear; a second internal ring gear, the second internal ring gear being coaxial to the first internal ring gear; a first external gear located within the first internal ring gear and coaxial to the first internal ring gear, the first external gear meshes with the first internal ring gear; and a second external gear located within the second internal ring gear and coaxial to the second internal ring gear, the second external gear meshes with the second internal ring gear. The first internal ring gear and the second internal ring gear are composed of a flexible material.

Abstract: A valve body for a servovalve is provided comprising: a first surface adapted to extend parallel and adjacent to a substantially flat pole piece surface of a pole piece in use; and attachment features provided on the first surface for attaching the valve body to the pole piece in use, wherein the first surface is contoured such that, in use, an area of the first surface surrounding the attachment features is in contact with the substantially flat pole piece surface and an area of the first surface removed from the attachment features is not in contact with the substantially flat pole piece surface.

Abstract: A rotor for a permanent magnet generator includes a rotor body extending between a first end and a second end, having a cylindrical bore and a plurality of flats on an outer peripheral surface. Permanent magnets are positioned at the flats. An outer ring surrounds the permanent magnets and defines an outer diameter. A ratio of the outer diameter to an axial length between the first and second ends is between 3.2 and 3.4. An integrated drive generator and a method are also disclosed.

Abstract: A controller for an inline valve includes a manifold seating a set screw and has a reference fluid port, a control fluid port, and an actuator fluid port. A selector is movable within the manifold between a first position and a second position, the reference fluid port in fluid communication with the actuator fluid port in the first position, the control fluid port in fluid communication with the actuator fluid port in the second position. A biasing member is arranged between the selector and the set screw and urges the selector towards the first position. The set screw extends through an exterior of the manifold for adjustment of differential in pressures at the reference fluid port and the control fluid port responsive to which the selector moves between the first position and the second position. Inline valves and methods of controlling fluid flow through inline valves are also described.

Abstract: Manufacturing methods are disclosed that can electropolish a metal surface by disposing an electrode over the metal surface, and a permeable dielectric spacer between the metal surface and the electrode. An electrolyte is infiltrated into the permeable dielectric spacer, and an electrical voltage differential is applied to the electrode and the metal surface.

Abstract: A control surface disconnect detection system includes a mechanical disconnect detection device that includes: a first contact element; a second contact element; and a mechanical fuse that includes a conduction path. In a normal operational state the conduction path creates an electrical pathway between the first contact element and second contact element and when in a control surface disconnected state the conduction path does not create an electrical pathway between the first contact element and the second contact element. The system also includes a radio frequency identification (RFID) tag connected to the first contact element and the second contact element such that when the mechanical disconnect detection device is in the normal operation state the RFID tag does not transmit information, and when the mechanical disconnect detection device is in the control surface disconnected state the RFID tag does transmit information.

Abstract: A system is provided. The system includes a first environmental control sub-system, operating in a first mode, that receives a first medium at a first flow amount and a first pressure. The system also includes a second environmental control sub-system, operating in a second mode, that receives a second medium at a second flow amount and a second pressure. The first flow amount is greater than the second flow amount, and the second pressure is greater than the first pressure.

Abstract: A heat exchanger includes a core section defining a plurality of first fluid channels and a plurality of second fluid channels. The heat exchanger also includes a header section defining a plurality of first fluid layers and a plurality of second fluid layers. The heat exchanger further includes a transition region located between the header section and the core section, the transition region fluidly coupling the plurality of first fluid layers to the first fluid channels, each of the first fluid layers routing a first fluid to a respective group of first fluid channels.

Abstract: A self-acting pressure activated drain valve includes at least one inlet configured to receive a fluid. A drainage passage delivers the fluid to at least one outlet where the fluid is expelled. The self-acting pressure activated drain valve further includes a flexible diaphragm configured to operate in an open position and a closed position based on a pressure. The flexible diaphragm is normally biased in the open position such that fluid is delivered from the at least one inlet to the at least one outlet via the drainage passage. The pressure, however, initiates the closed position such that air is prevented from flowing through the drainage passage.