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A sealing unit for sealing a gap between a pair of surfaces includes a nozzle for injecting sealant into the gap, rollers, an endless track round the rollers, and a curing device. The sealing unit is moved along the length of the gap. A sealant is injected into the gap from the nozzle and the track

A sealing unit for sealing a gap between a pair of surfaces includes a nozzle for injecting sealant into the gap, rollers, an endless track round the rollers, and a curing device. The sealing unit is moved along the length of the gap. A sealant is injected into the gap from the nozzle and the track is rotated around the rollers as they are moved along the length of the gap. The track is pressed onto first and second surfaces so the sealant in the gap is constrained by the track to lie substantially flush with the first and second surfaces. The sealing unit is moved along the length of the gap at a rate such that the sealant becomes sufficiently cured when it is in contact with the track so that the track can be peeled away from the sealant as the track rotates round the second roller.

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1. Apparatus for sealing a gap between a pair of surfaces, the apparatus comprising a nozzle for injecting sealant into the gap; two or more rollers; an endless track which passes round the rollers; and a curing device for directing energy into the gap to accelerate cure of the sealant, wherein the

1. Apparatus for sealing a gap between a pair of surfaces, the apparatus comprising a nozzle for injecting sealant into the gap; two or more rollers; an endless track which passes round the rollers; and a curing device for directing energy into the gap to accelerate cure of the sealant, wherein the curing device is arranged so as to direct energy into the gap through the track. 2. The apparatus of claim 1 wherein the curing device is positioned inside the endless track. 3. The apparatus of claim 1 wherein the rollers include a first roller and a second roller, and wherein the track has: a. a sealing portion and a return portion between the first and second rollers,b. a first curved portion where it passes round the first roller, andc. a second curved portion where it passes round the second roller. 4. The apparatus of claim 3 wherein the curing device is arranged so as to direct energy through the first curved portion or the sealing portion of the track. 5. The apparatus of claim 3 wherein the sealing portion is substantially planar at all points between the first and second rollers. 6. The apparatus of claim 3 further comprising one or more guide rollers which engage the sealing portion of the track. 7. The apparatus of claim 1 further comprising a sealant reservoir containing the sealant; and a pipe for feeding the sealant from the reservoir to the nozzle. 8. The apparatus of claim 1 further comprising a chassis which supports the rollers and the curing device. 9. A method of sealing a gap between first and second aerodynamic surfaces, the method comprising providing a nozzle, two or more rollers, an endless track which passes round the rollers, and a curing device; moving the nozzle, rollers and curing device at the same time along the length of the gap; and as they move along the gap: a. injecting a sealant into the gap from the nozzle;b. rotating the track around the rollers;c. pressing the track onto the first and second surfaces so the sealant in the gap is constrained by the track to lie substantially flush with the first and second surfaces; andd. directing energy into the sealant with the curing device, the curing energy accelerating cure of the sealant; wherein the sealing unit is moved along the length of the gap at a rate such that the sealant becomes sufficiently cured when it is in contact with the track so that the track peels off from the sealant as it moves away from the first and second surfaces, wherein the energy is directed into the sealant from the curing device through the track. 10. The method of claim 9 wherein the gap comprises a channel with a base and a pair of side walls; and wherein the sealant substantially fills the channel as it is injected into it by the nozzle. 11. Apparatus for sealing a gap between a pair of surfaces, the apparatus comprising a nozzle for injecting sealant into the gap; two or more rollers; an endless track which passes round the rollers; and a curing device for directing energy into the gap to accelerate cure of the sealant, wherein the rollers include a first roller and a second roller, wherein the track has: a. a sealing portion and a return portion between the first and second rollers,b. a first curved portion where it passes round the first roller, andc. a second curved portion where it passes round the second roller, wherein the second roller is positioned aft of the first roller; and the nozzle is positioned aft of the first curved portion of the track and forward of the second curved portion of the track. 12. A method of sealing a gap between first and second aerodynamic surfaces, the method comprising providing a nozzle, two or more rollers, an endless track which passes round the rollers, and a curing device; moving the nozzle, rollers and curing device at the same time along the length of the gap; and as they move along the gap: a. injecting a sealant into the gap from the nozzle;b. rotating the track around the rollers;c. pressing the track onto the first and second surfaces so the sealant in the gap is constrained by the track to lie substantially flush with the first and second surfaces; andd. directing energy into the sealant with the curing device, the curing energy accelerating cure of the sealant; wherein the sealing unit is moved along the length of the gap at a rate such that the sealant becomes sufficiently cured when it is in contact with the track so that the track peels off from the sealant as it moves away from the first and second surfaces, and wherein the first and second aerodynamic surfaces are on an aircraft. 13. A method of sealing a gap between first and second aerodynamic surfaces, the method comprising providing a nozzle, two or more rollers, an endless track which passes round the rollers, and a curing device; moving the nozzle, rollers and curing device at the same time along the length of the gap; and as they move along the gap: a. injecting a sealant into the gap from the nozzle;b. rotating the track around the rollers;c. pressing the track onto the first and second surfaces so the sealant in the gap is constrained by the track to lie substantially flush with the first and second surfaces; andd. directing energy into the sealant with the curing device, the curing energy accelerating cure of the sealant; wherein the sealing unit is moved along the length of the gap at a rate such that the sealant becomes sufficiently cured when it is in contact with the track so that the track peels off from the sealant as it moves away from the first and second surfaces, wherein the rollers include a first roller and a second roller, the second roller being positioned aft of the first roller relative to their direction of movement; the track has a sealing portion and a return portion between the first and second rollers, a first curved portion where it passes round the first roller, and a second curved portion where it passes round the second roller; and the nozzle is positioned aft of the first curved portion of the track and forward of the second curved portion.