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This paper presents thermal-vacuum test data obtained for the JEM MAXI loop heat pipe (LHP) with two separate radiators operating under transient regimes representative of those to be encountered during the flight. The Monitor of All-sky X-ray Image (MAXI) in the Japanese Experiment Module (JEM), on the International Space Station (ISS), is an X-ray camera with wide fields of view to monitor the universe. The LHP collects about 32 Watts of heat dissipated by the detector and thermoelectrics and transports it to two separate radiators, with orthogonal views to space. Propylene is used as a working fluid due to a wide useful operating temperature range from -60°C to +60°C needed for this program. The LHP utilizes two fluid flow regulators to control fluid flow in the two parallel condensers and is equipped with two startup heaters, and three shutdown heaters controlled by six thermostats.