FIELD: test equipment. SUBSTANCE: conditions of leak-proofness test of spaceships consisting of mechanically linked modules with pipe-lines laid inside and outside their casings, systems including thermoregulating systems providing for functioning of spaceships are approximated to natural conditions of spaceship functioning. The spaceship is placed in a vacuum chamber. The vacuum chamber is evacuated. The systems, including the thermoregulating system, are filled in turn with test gas; after each filling the increase of test gas concentration in the vacuum chamber is measured to determine the amount of test gas flowing out from the systems, the thermoregulating system inclusive. After determination of the amount of test gas outflow from the thermoregulating system test gas is removed from it. Prior to the tests of each module, the thermoregulating system and the vacuum chamber get communicated, the module is filled with test gas, the increase of test gas concentration in the vacuum chamber is measured to determine the amount of test gas flowing out from it, the thermoregulating system and the vacuum chamber are disconnected, the decrease of test gas concentration in the vacuum chamber is measured to determine the amount of test gas flowing into the thermoregulating system from the given module and the amount of test gas inflow into the thermoregulating system as the sum of the amount of test gas flowing into the thermoregulating system from all modules. EFFECT: facilitated procedure.
