Abstract: An actuator control arrangement comprising: a hydraulic actuator having a housing and a piston rod axially moveable within the housing between a neutral position, a retracted position and an extended position with respect to the housing in response to application of pressure to the piston rod; the arrangement further comprising a check valve moveable between a first position providing a flow path between a pressure source and the actuator, and a second position in which the flow path is closed off; and characterised by a mechanical link between the piston rod and the check valve, actuated in response to the piston rod passing a predetermined retracted position in a negative stroke direction, to set the check valve to the first position.

Abstract: A rotor for an electrical machine comprises a rotor body having an external, axially extending magnet receiving surface for receiving at least one magnet thereon, and a flange mounting portion at at least one axial end of the magnet receiving surface. The flange mounting portion has a smaller external dimension (D1) than an external dimension (D2) of the magnet receiving surface so as to form a shoulder between the magnet receiving surface and the flange mounting portion. A magnet retaining flange is mounted over the flange mounting portion of the rotor body and located against the shoulder. The magnet retaining flange is retained against the shoulder by at least one lip of the flange mounting portion of the rotor body which extends radially outwardly over a radially inner portion of the magnet retaining flange. The lip by deforming an end face of the flange mounting portion.

Abstract: A spoiler actuator can be operated by applying high pressure to a first chamber of the actuator on receipt of a command to extend the spoiler; applying high pressure to a second chamber of the actuator on receipt of a command to retract the spoiler; and on failure of a supply of the high pressure actuating an anti-extension valve to prevent extension of the spoiler; disengaging the anti-extension valve to permit extension if pressure applied to the anti-extension valve exceeds a predetermined force of a spring biasing the anti-extension valve to the engaged position, wherein additional force is applied to the anti-extension valve if the spoiler is retracted beyond a neutral position.

Abstract: An actuator control arrangement comprising: a hydraulic actuator having a housing and a piston rod axially moveable within the housing between a neutral position, a retracted position and an extended position with respect to the housing in response to application of pressure to the piston rod; the arrangement further comprising a check valve moveable between a first position providing a flow path between a pressure source and the actuator, and a second position in which the flow path is closed off; and characterised by a mechanical link between the piston rod and the check valve, actuated in response to the piston rod passing a predetermined retracted position in a negative stroke direction, to set the check valve to the first position.

Abstract: A spoiler actuator can be operated by applying high pressure to a first chamber of the actuator on receipt of a command to extend the spoiler; applying high pressure to a second chamber of the actuator on receipt of a command to retract the spoiler; and on failure of a supply of the high pressure actuating an anti-extension valve to prevent extension of the spoiler; disengaging the anti-extension valve to permit extension if pressure applied to the anti-extension valve exceeds a predetermined force of a spring biasing the anti-extension valve to the engaged position, wherein additional force is applied to the anti-extension valve if the spoiler is retracted beyond a neutral position.

Abstract: A rotor for an electrical machine comprises a rotor body having an external, axially extending magnet receiving surface for receiving at least one magnet thereon, and a flange mounting portion at at least one axial end of the magnet receiving surface. The flange mounting portion has a smaller external dimension (D1) than an external dimension (D2) of the magnet receiving surface so as to form a shoulder between the magnet receiving surface and the flange mounting portion. A magnet retaining flange is mounted over the flange mounting portion of the rotor body and located against the shoulder. The magnet retaining flange is retained against the shoulder by at least one lip of the flange mounting portion of the rotor body which extends radially outwardly over a radially inner portion of the magnet retaining flange. The lip by deforming an end face of the flange mounting portion.

Abstract: A sealing arrangement for an actuator, said sealing arrangement comprising: a sealing surface; and two or more seal recesses for receiving seals, said two or more seal recesses provided at the sealing surface of the sealing arrangement.