OPEN ROTOR AIRCRAFT PROPULSION SYSTEM WITH GUIDE VANE STRUCTURE RECEPTACLE

An aircraft propulsion system (20) assembly includes an open propulsor rotor (34) and a housing structure (54). The housing structure (54) includes an engine case (106), a nacelle structure (108) and a receptacle (126). The nacelle structure (108) is disposed radially outboard of and partially covers an engine case (106). The nacelle structure (108) forms a first axial section of an exterior flow boundary (56) for the aircraft propulsion system (20) that borders an environment (22) external to the aircraft propulsion system (20). The receptacle (126) is disposed radially outboard of the engine case (106) and axially between the open propulsor rotor (34) and the nacelle structure (108). The receptacle (126) is configured to receive a structure base (50) of an open guide vane structure (36).