Nozzle guide vane assembly for a gas turbine engine

A nozzle guide vane assembly for a gas turbine engine comprising a circumferentially extending array of angularly spaced apart aerofoils, retaining structure for the aerofoils and projections from each aerofoil adapted to engage with the retaining structure to retain the aerofoils in their longitudinal direction, inner and outer platform members separate from the aerofoils and each comprising two skins, a thicker support skin having at least one aerofoil section aperture therein through which one said aerofoil projects and which retains the aerofoil against twisting, circumferential or axial loads and a thinner inner gas contacting skin which also has at least one aerofoil section aperture therein through which the aerofoil projects, said thinner inner gas contacting skin serving to define the respective boundary of the gas flow through the assembly, the aerofoil being free to slide through the apertures sufficiently to permit relative expansions in a direction longitudinal of the aerofoil, and sealing means associated with each said inner skin adapted to form a seal between said inner skin and said aerofoils.