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A check device is provided for a flight actuator primary load path failure detection device of the type that disconnects a position sensor from the primary load path in the event of a primary load path failure. The check device comprises: a mechanical linkage for simulating disconnection of the posi

A check device is provided for a flight actuator primary load path failure detection device of the type that disconnects a position sensor from the primary load path in the event of a primary load path failure. The check device comprises: a mechanical linkage for simulating disconnection of the position sensor by permitting relative movement of at least first and second mechanical parts of the actuator that are unable to move relative to one another in normal use without failure of the primary load path, wherein these first and second mechanical parts, include a first mechanical part with movement detected by the position sensor of the primary load path failure detection device.

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1. A check device for a flight actuator primary load path failure detection device of the type that disconnects a position sensor from the primary load path in the event of a primary load path failure, the check device comprising: a mechanical linkage for simulating disconnection of the position sen

1. A check device for a flight actuator primary load path failure detection device of the type that disconnects a position sensor from the primary load path in the event of a primary load path failure, the check device comprising: a mechanical linkage for simulating disconnection of the position sensor by permitting relative movement of at least a first mechanical part of the actuator and a second mechanical part of the actuator that are unable to move relative to one another in normal use without failure of the primary load path, wherein the first and second mechanical parts each include a first part with movement detected by the position sensor of the primary load path failure detection device. 2. A check device as claimed in claim 1, being for a primary load path failure detection device of the type that includes the position sensor as a first position sensor for detecting the position of the primary load path based on movement of the first mechanical part, and also includes a second position sensor for detecting the position of the primary load path based on movement of the second mechanical part. 3. A check device as claimed in claim 1, wherein the primary load path failure detection device is of the type that includes a releasable element normally coupled between the mechanical parts and acting to inhibit relative movement thereof and this releasable element is used as a part of the check device. 4. A check device as claimed in claim 3, wherein the releasable element is arranged to be disconnected upon failure of the primary load path, wherein the disconnection of the releasable element disconnects the position sensor from the primary load path by disconnection of the first mechanical part from the primary load path. 5. A check device as claimed in claim 3, wherein the releasable element is a releasable pin element that is in normal use coupled between elements of the primary load path and the secondary load path and is released upon failure of the primary load path. 6. A check device as claimed in claim 1, wherein the check device includes a releasable element of the primary load path failure detection device, this releasable element being coupled between the first and second mechanical parts. 7. A check device as claimed in claim 1, wherein the mechanical parts are gears coupled to a screw in a primary load path of the actuator, the gears being arranged such that in normal use they rotate together, and the mechanical linkage of the check device being arranged such that, when actuated, it moves one of the gears relative to the other. 8. A check device as claimed in claim 1, wherein the mechanical linkage comprises a connecting rod coupled between a releasable element of the check device and the first mechanical part, with the connecting rod arranged to move the first mechanical part relative to the second mechanical part when the mechanical linkage is actuated. 9. A check device as claimed in claim 8, wherein the first mechanical part is a first gear, a first end of the connecting rod is mounted on a slider permitting movement of the rod along a radial direction of the gear, and a second end of the connecting rod extends into a slot, the slot having a diagonal extent along both the radial and circumferential directions of the gear. 10. A check device as claimed in claim 9, wherein the first end of the connecting rod is connected to a slider at the releasable element with the second end of the connecting rod extending into a slot formed on the gear. 11. A check device as claimed in claim 1, wherein the flight actuator includes a casing and wherein the mechanical linkage is arranged to be actuated from outside of the flight actuator without the need to remove the casing of the flight actuator by operation of a button outside of the flight actuator casing. 12. A primary load path failure detection device incorporating a check device as claimed in claim 1. 13. A primary load path failure detection device as claimed in claim 12, wherein the primary load path failure detection device includes a releasable element normally coupled between the mechanical parts and acting to inhibit relative movement thereof, and this releasable element is used as a part of the check device. 14. A primary load path failure detection device as claimed in claim 12, the detection device including the position sensor as a first position sensor for detecting the position of the primary load path based on movement of the first mechanical part, and also including a second position sensor for detecting the position of the primary load path based on movement of the second mechanical part. 15. An lower attachment for a flight actuator, the attachment including a primary load path failure detection device as claimed in claim 12. 16. A flight control actuator including: a primary load path with a hollow screw; a secondary load path having a rod passing through the screw, the secondary load path being arranged to take over the load exerted on the primary load path in the event of a break in the primary load path; and a check device as claimed in claim 1.