A nozzle installation includes at least one nozzle configured for introducing cleaning media containing solids into a jet engine, and for a rotationally fixed connection to a shaft of a turbofan of a jet engine. The at least one nozzle has a swivel coupling to which a line connection is connectable. A flexible hose forms a connection of a nozzle-side outlet of the swivel coupling to an inlet of the at least one nozzle.