Abstract: A duct stringer forms at least part of a duct with a closed cross-section which is adapted to transport fluid. The duct stringer has a duct wall and a female bayonet fitting in the duct wall. The female bayonet fitting is configured to engage with a male bayonet fitting on a fluid transporting conduit to connect the fluid transporting conduit with the duct.

Abstract: A connector, a connector assembly, an aircraft fuel breather system and an aircraft wing are disclosed. The connector connects a breather pipe or float valve to a hat section stringer duct attached to an aircraft panel. The connecter has a bridge to bridge over the duct and to cover an aperture in a wall of the duct. The bridge has a flange on either side for attachment of the connector to the panel. The connector has a seal to seal the bridge to the duct, an aperture defined in the bridge and a flow controller connector to connect and provide fluid connection between the connector and pipe or float valve. The assembly comprises the connector, the duct and aircraft panel and the fuel breather system includes one or more fuel tanks, a breather pipe and a vent to atmosphere.

Abstract: A duct stringer is disclosed and forms at least part of a duct with a closed cross-section which is adapted to transport fluid. The duct stringer has a duct wall and a female bayonet fitting in the duct wall. The female bayonet fitting is configured to engage with a male bayonet fitting on a fluid transporting conduit to connect the fluid transporting conduit with the duct. The present application also relates to an aircraft assembly comprising the duct stringer and the fluid transporting conduit.

Abstract: A coupling for fuel pipe includes a pipe end fitting, which includes a male outer surface including a groove and a female inner surface including a groove. The coupling includes a double-walled socket including a female outer socket and a male inner shaft. The pipe end fitting is accommodated in the region between the female outer socket and the male inner shaft. A first seal ring seals between the female inner surface and the male inner shaft. A second seal ring, which may be substantially coplanar with the first, seals between the male outer surface and the female outer socket of the double-walled socket. The coupling may be so arranged that the pipe end fitting and the double-walled socket are able to pivot relative to each other by up to at least ±2 degrees and are able to slide both towards and apart from each other.

Abstract: A coupling for connecting double-walled fuel comprises a pipe end fitting (1), which includes a male outer surface for example including a groove (12) and a female inner surface for example including a groove (11). The coupling also includes a double-walled socket (4), which includes a female outer socket (17) and a male inner shaft (18). The pipe end fitting is partially accommodated in the region between the female outer socket and the male inner shaft of the double-walled socket. A first seal ring (9) seals between the female inner surface of the pipe end fitting (1) and the male inner shaft (18) of the double-walled socket (4). A second seal ring (10) which may be substantially coplanar with the first, seals between the male outer surface of the pipe end fitting (1) and the female outer socket (17) of the double-walled socket (4).