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The experimental setup Cyrène has been designed and operated by CEA in partnership with CNES and IMFT in order to provide future designers of two-phase ammonia environmental control systems with adequate knowledge and data. The whole loop (esp. boiler, visualization boxes and condensers) is constructed with 4.8 mm aluminum circular pipe. Ammonia mass flow rate and quality values range up to 0.24 g/s and 0.8 respectively. Results presented in this paper have been obtained in three parabolic flights performed in May 1997 on the CNES Airbus A300. Flow patterns have been identified from high speed video recordings at 500 frames/second through two visualization test sections downstream from the evaporator outlet. Four different flow configurations have been characterized versus the mass flow rate and the quality or versus the superficial velocities of the liquid and the vapor phases: bubbly, slug, slug-annular and annular flows. Bubbly flow is seldom observed.