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An aircraft slat assembly comprising a pair of slats separated by a gap. A weather seal seals the gap between the slats and forms part of an outer aerodynamic surface of the slat assembly. An anti-icing system is provided with a pair of piccolo tubes, each tube being housed within a respective one o

An aircraft slat assembly comprising a pair of slats separated by a gap. A weather seal seals the gap between the slats and forms part of an outer aerodynamic surface of the slat assembly. An anti-icing system is provided with a pair of piccolo tubes, each tube being housed within a respective one of the slats and having spray holes for delivering hot gas to a leading edge of the slat in which it is housed. A flexible duct delivers hot gas between the piccolo tubes, the flexible duct passing across the gap between the slats. A vent in the weather seal can open to permit hot gas from the anti-icing system to exit the gap between the slats.

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1. An aircraft slat assembly comprising: a. a pair of slats separated by a gap;b. a weather seal which seals the gap between the slats and forms part of an outer aerodynamic surface of the slat assembly;c. an anti-icing system comprising: i. a pair of piccolo tubes, each tube being housed within a r

1. An aircraft slat assembly comprising: a. a pair of slats separated by a gap;b. a weather seal which seals the gap between the slats and forms part of an outer aerodynamic surface of the slat assembly;c. an anti-icing system comprising: i. a pair of piccolo tubes, each tube being housed within a respective one of the slats and having spray holes for delivering hot gas to a leading edge of the slat in which it is housed; andii. a flexible duct for delivering hot gas between the piccolo tubes, the flexible duct passing across the gap between the slats; andd. a vent in the weather seal which can open to permit hot gas from the anti-icing system to exit the gap between the slats. 2. The assembly of claim 1 wherein the vent comprises a thermal fuse which opens the vent by thermal failure when the thermal fuse is heated by the hot gas. 3. The assembly of claim 2 wherein the thermal fuse comprises a thermoplastic material which fails when it is heated by the hot gas. 4. The assembly of claim 1 wherein the vent comprises a plug which normally closes the vent and can be removed to open the vent and permit hot gas from the anti-icing system to exit the gap between the slats. 5. The assembly of claim 1 further comprising a baffle which extends across the gap between the slats and is positioned to obstruct the flow of hot gas in the gap away from the vent. 6. The assembly of claim 1 wherein the weather seal and/or the flexible duct are formed from an elastomeric material. 7. An aircraft wing comprising a main wing body with a leading edge; a slat assembly according to claim 1 mounted on the leading edge of the main wing body; and an actuation mechanism for moving the slat assembly relative to the main wing body between an extended position and a retracted position. 8. The wing of claim 7 wherein the leading edge of the main wing body is formed from a composite material. 9. A method of venting a gap between a pair of slats on an aircraft wing, the method comprising: a. providing a weather seal which seals the gap between the slats and forms part of an outer aerodynamic surface of the aircraft wing;b. delivering hot gas to a leading edge of each slat from spray holes of a pair of anti-icing piccolo tubes, each tube being housed within a respective one of the slats;c. delivering hot gas between the piccolo tubes with a flexible duct which passes across the gap between the slats;d. flexing the weather seal and the duct to allow movement between the slats;e. providing a vent in the weather seal; andf. opening the vent to permit hot gas from the flexible duct to exit the gap between the slats through the vent in the event of failure of the flexible duct. 10. The method of claim 9 wherein the vent comprises a thermal fuse which opens the vent by thermal failure when the thermal fuse is heated by the hot gas. 11. The method of claim 10 wherein the thermal fuse comprises a thermoplastic material which fails when it is heated by the hot gas. 12. The method of claim 9 wherein the vent comprises a plug which is removed to open the vent. 13. The method of claim 9 further comprising obstructing the flow of hot gas in the gap away from the vent with a baffle which extends across the gap between the slats.