A sealing system (38) for use in an aircraft facility to be sealed from the environment comprises a closing element (40) which can be connected to a housing (42) of the aircraft facility in order to seal an opening (44) formed in the housing (42) of the aircraft facility. Furthermore, the sealing system (38) comprises a receiving device (46), and a sealing element (48) received in the receiving device (46). A transfer device (54) is adapted to transfer the sealing element (48) between an inactive state, in which the sealing element (48) is shaped and/or positioned such that it cannot be brought into sealing contact with a sealing surface (64), and an active state, in which the sealing element (48) is shaped and/or positioned such that it can be brought into sealing contact with the sealing surface (64).