FIELD: test equipment, in particular, tests for air-tightness of spacecraft systems having isolated successively or parallel connected volumes filled with working medium. SUBSTANCE: the method consists in measurement of pressure and temperature in the controlled volume at the initial time moment, gas overflow during the check time with a subsequent measurement of pressure and temperature in the volume under test, after measurement of pressure and temperature, determination of the check rate of change of pressure during the check time and the check of air-tightness as compared with the check and present rate of change of pressure in the volume under test. Used as gas overflow is the gas discharge from the volume under test at a standard operation of the jet engine. The time of standard operation of the jet engine is taken as the check time. The parameters characterizing the thrust of the jet engine are measured, according to which the value of thrust of the jet engine at standard operation during the check time is determined. According to the time of operation and determined thrust of the jet engine the actual flow rate of gas from the volume under test is determined, by which the check rate of change of pressure in the volume under test is determined. On completion of the work of the jet engine the volume under test is isolated, and the pressure and temperature in the volume under is determined. On completion of the work of the jet engine the volume under test is isolated, and the pressure and temperature in the volume under test during the idle time of the jet engine are measured after fixed time intervals, during each of them the present rate of pressure change is determined, as compared with the check and present rate of pressure change the value of loss of air-tightness of the volume under test is checked and determined. EFFECT: provided determination of the point of leakage in the system of isolated volumes and check of air-tightness of the gas-filled system in the process of long service of the space craft in the conditions of unmanned flight. 1 dwg
