Abstract: As part of a recent battery of parametric line chilldown tests using liquid nitrogen (LN2), to develop cryogenic-based quenching correlations, experiments were performed onboard a C9 aircraft flying parabolic trajectories to simulate reduced gravity to supplement the wide range of tests conducted in 1-g for horizontal, vertical upward and downward flows. Ten reduced gravity chilldown tests were performed on a 1.27 diameter tube over the range 2,000 Re 80,000. Results show that in reduced grav…