Abstract: A lock assembly includes a housing, a lock shaft, a reset shaft, and a transfer gear. The lock shaft is disposed partially within and extends from the housing and is movable between a lock position and an unlock position. The reset shaft is disposed at least partially within the housing, is spaced apart from the lock shaft, and is movable between a first position and a second position. The transfer gear is disposed between, and engages, the lock shaft and the reset shaft, and is configured to transfer motion between the lock shaft and the reset shaft. When the lock shaft moves from the lock position to the unlock position, the reset shaft is moved from the first position to the second position, and when the reset shaft moves from the second position to the first position, the lock shaft is moved from the unlock position to the lock position.

Abstract: A spark ignition device has a ceramic insulator surrounded by a metal shell. The metal shell extends along a longitudinal axis to a distal end. A center electrode is received in the ceramic insulator and extends along the longitudinal axis. A ground electrode has an attachment end fixed by a weld joint to the distal end of the shell and a free end extending from the distal end to provide a spark gap. The weld joint includes a capacitive pulse discharge weld joint and a laser weld joint, which in combination inhibit material expulsion; provide a reliable, strong attachment of the ground electrode to the shell; provide an improved heat transfer path between the ground electrode and the shell, and facilitate repeatable and accurate positioning of the ground electrode to the shell. The weld joint includes a homogeneous mixture of the metal shell and the ground electrode.

Abstract: A spark ignition device has a ceramic insulator surrounded by a metal shell. The metal shell extends along a longitudinal axis to a distal end. A center electrode is received in the ceramic insulator and extends along the longitudinal axis. A ground electrode has an attachment end fixed by a weld joint to the distal end of the shell and a free end extending from the distal end to provide a spark gap. The weld joint includes a capacitive pulse discharge weld joint and a laser weld joint, which in combination inhibit material expulsion; provide a reliable, strong attachment of the ground electrode to the shell; provide an improved heat transfer path between the ground electrode and the shell, and facilitate repeatable and accurate positioning of the ground electrode to the shell. The weld joint includes a homogeneous mixture of the metal shell and the ground electrode.

Abstract: A relatively small, lightweight actuator includes a plurality of motors, an actuation element, a translation member, and a plurality of position sensors. The motors each supply a drive force to the actuation member, causing it to rotate. The translation member is configured, upon rotation of the actuator, to translate to a position. The position sensors sense the translational position of the translation member and the rotational position of each motor. The actuator is relatively small, lightweight, and can withstand the relatively severe environmental conditions and relatively significant levels of vibration and shock associated with many aerospace applications.

Abstract: A relatively small, lightweight valve actuator assembly that can withstand relatively high levels of vibration and shock includes a motor, a position sensor, and a drive belt mounted on an actuator housing assembly. The position sensor is preferably disposed within a sensor housing that is mounted on a side of the actuator housing assembly. As a result, the overall center-of-gravity (CG) and weight of the actuator assembly is significantly reduced, as is the overall size envelope.

Abstract: An aircraft brake actuation system implements an anti-hysteresis feature that compensates for various hysteresis effects exhibited in an aircraft brake actuation system due to one or more sources of mechanical inefficiency within the system. The anti-hysteresis feature adjusts the command signal up or down, depending on the direction of the command, a predetermined amount based on the amount of hysteresis in the system. By doing so, the actual brake force supplied to the aircraft brake elements more accurately represents the brake force being commanded.

Abstract: An aircraft brake actuation system includes an actuator for selectively moving to a position that corresponds to a commanded brake force. A cap assembly is coupled to the end of the actuator and is configured to engage an aircraft brake element and supply the commanded brake force to one or more aircraft wheels. The cap assembly is constructed of a low thermal conductivity material and has thermal resistance grooves formed therein. The cap assembly is also configured to compensate for certain undesired tangential movements that may occur during an aircraft brake cycle.

Abstract: An aircraft brake actuation system includes an actuator for selectively supplying a commanded brake force to one or more aircraft wheels. The actuator includes a ballscrew, a ballnut, and a plurality of balls. The ballscrew has a plurality of ball grooves formed on its inner surface, and is coupled to receive a rotational drive force. The ballnut is mounted against rotation, is disposed at least partially within the ballscrew, and includes a plurality of ball grooves formed on its outer surface. The plurality of balls are disposed within the ballnut ball grooves and at least selected ones of the ballscrew ball grooves.

Abstract: An electromechanical inlet guide vane actuation system includes one or more electric motor driven actuators that are used to appropriately position the inlet guide vanes in a gas turbine engine. The actuation system includes a control circuit that supplies guide vane actuation control signals in response to guide vane position command signals it receives. The guide vane actuation control signals are supplied to one or more electric motors, which position actuators, and thus the inlet guide vanes, to the commanded position.