A tip turbine engine assembly includes a compressor module (12) and a fan module (14) located aft of the compressor module (12). The compressor module (12) and fan module (14) are fastened together along a mating portion with seals that generally prevent airflow from escaping through the mating portion. The compressor module (12) and fan module (14) are independently attachable to each other such that the compressor module (12) may be attached or detached to or from the fan module (14) without having to significantly disassemble the fan module (14), and verse visa.