A system for detecting and controlling the position of a spoiler of an aircraft wing in the event of electrical failure, comprising: a spoiler; a hydraulic actuator having a piston rod operably connected to the spoiler, the piston rod being moveable between a retracted position, a neutral position and an extended position; and means for providing power to said hydraulic actuator; and a mechanical device operatively connected to the hydraulic actuator to detect whether the piston rod is in the retracted position, the neutral position or the extended position; and a pressure relief valve, operatively connected to the mechanical device, that is configured to provide a change in a load applied to said hydraulic actuator, wherein said pressure relief valve is movable between a first position to a second position, thereby changing said load based on whether said piston rod is detected by the mechanical device as being in said retracted position or said extended position, characterised in that the actuator comprises a biasing member operatively connected to the piston rod via a tracking portion, the tracking portion comprising a linearly spaced first portion and second portion, the first and second portions having a sloped portion positioned there between, such that the tracking portion comprises a variable diameter over its length, wherein, when the piston rod is in the extended portion, the mechanical device is in contact with the first portion of the tracking portion, and as the piston rod retracts, the tracking portion is configured to move linearly with respect to the mechanical device such that, when the piston rod is in the retracted position, the mechanical device is in contact with the second portion of the hydraulic actuator, and wherein the difference in diameter of the first and second portions results in a changed position of mechanical device, thereby moving the pressure relief valve from the first position to the second position. a spoiler; a hydraulic actuator having a piston rod operably connected to the spoiler, the piston rod being moveable between a retracted position, a neutral position and an extended position; and means for providing power to said hydraulic actuator; and a mechanical device operatively connected to the hydraulic actuator to detect whether the piston rod is in the retracted position, the neutral position or the extended position; and a pressure relief valve, operatively connected to the mechanical device, that is configured to provide a change in a load applied to said hydraulic actuator, wherein said pressure relief valve is movable between a first position to a second position, thereby changing said load based on whether said piston rod is detected by the mechanical device as being in said retracted position or said extended position, characterised in that the actuator comprises a biasing member operatively connected to the piston rod via a tracking portion, the tracking portion comprising a linearly spaced first portion and second portion, the first and second portions having a sloped portion positioned there between, such that the tracking portion comprises a variable diameter over its length, wherein, when the piston rod is in the extended portion, the mechanical device is in contact with the first portion of the tracking portion, and as the piston rod retracts, the tracking portion is configured to move linearly with respect to the mechanical device such that, when the piston rod is in the retracted position, the mechanical device is a hydraulic actuator having a piston rod operably connected to the spoiler, the piston rod being moveable between a retracted position, a neutral position and an extended position; and means for providing power to said hydraulic actuator; and a mechanical device operatively connected to the hydraulic actuator to detect whether the piston rod is in the retracted position, the neutral position or the extended position; and a pressure relief valve, operatively connected to the mechanical device, that is configured to provide a change in a load applied to said hydraulic actuator, wherein said pressure relief valve is movable between a first position to a second position, thereby changing said load based on whether said piston rod is detected by the mechanical device as being in said retracted position or said extended position, characterised in that the actuator comprises a biasing member operatively connected to the piston rod via a tracking portion, the tracking portion comprising a linearly spaced first portion and second portion, the first and second portions having a sloped portion positioned there between, such that the tracking portion comprises a variable diameter over its length, wherein, when the piston rod is in the extended portion, the mechanical device is in contact with the first portion of the tracking portion, and as the piston rod retracts, the tracking portion is configured to move linearly with respect to the mechanical device such that, when the piston rod is in the retracted position, the mechanical device is in contact with the second portion of the hydraulic actuator, and wherein the difference in diameter of the first and second portions results in a changed position of mechanical device, thereby moving the pressure relief valve from the first position to the second position.