A method for maintaining at least one protective suit, in particular a chemical protective suit, comprising the steps: a) at least one maintenance adapter (24, 26) is releasably and sealingly connected to at least one opening of the protective suit, b) a cleaning and disinfecting fluid is conducted into the interior of the protective suit via the at least one maintenance adapter (24, 26) and the cleaning and disinfecting fluid conducted into the interior of the protective suit is discharged from the protective suit, c) a drying gas is conducted into the interior of the protective suit via the at least one maintenance adapter (24, 26) for drying the protective suit and the drying gas conducted into the interior of the protective suit is discharged from the protective suit, d) the at least one maintenance adapter (24, 26) is disconnected from the at least one opening of the protective suit, characterized in that, after the method step b) and before the method step c) in a method step b1), for the tightness testing of the protective suit a compressed gas is conducted into the interior of the protective suit via the at least one maintenance adapter (24, 26) until a predetermined pressure level prevails in the protective suit, the pressure level prevailing in the protective suit is measured over a predetermined time period and then the compressed gas conducted into the interior of the protective suit is discharged from the protective suit via the at least one maintenance adapter (24, 26), and in that in the method step b1) a warning signal is also output if the pressure level falls below a defined limit value in the predetermined time period. a) at least one maintenance adapter (24, 26) is releasably and sealingly connected to at least one opening of the protective suit, b) a cleaning and disinfecting fluid is conducted into the interior of the protective suit via the at least one maintenance adapter (24, 26) and the cleaning and disinfecting fluid conducted into the interior of the protective suit is discharged from the protective suit, c) a drying gas is conducted into the interior of the protective suit via the at least one maintenance adapter (24, 26) for drying the protective suit and the drying gas conducted into the interior of the protective suit is discharged from the protective suit, d) the at least one maintenance adapter (24, 26) is disconnected from the at least one opening of the protective suit, characterized in that, after the method step b) and before the method step c) in a method step b1), for the tightness testing of the protective suit a compressed gas is conducted into the interior of the protective suit via the at least one maintenance adapter (24, 26) until a predetermined pressure level prevails in the protective suit, the pressure level prevailing in the protective suit is measured over a predetermined time period and then the compressed gas conducted into the interior of the protective suit is discharged from the protective suit via the at least one maintenance adapter (24, 26), and in that in the method step b1) a warning signal is also output if the pressure level falls below a defined limit value in the predetermined time period.