an aircraft wing , a fusion bonded thermoplastic fixed leading edge structure for aircraft aerodynamic surfaces and a method of manufacture are provided . the fixed leading edge structure comprises a leading edge skin , one or more aerodynamic profile defining stiffening members spaced spanwise therewithin and a sub - spar . each of the components are of low modulus consolidated composite material and the leading edge skin is attached to the stiffening members and to the sub - spar by a fusion - bonding thermoplastic process .