Abstract: The present invention relates to a method for detecting a defective sandwich component, particularly in aircraft construction, the method comprising the following steps: forming at least one measuring chamber in a core arrangement of a sandwich component, said at least one measuring chamber having an outwardly open end; subjecting the at least one measuring chamber to a predetermined pressure; and detecting and evaluating the pressure forming in the at least one measuring chamber.

Abstract: The safety apparatus for locking slatted roller shutters is disposed in a channel-shaped shutter rail provided on the side of the roller shutter and comprises a locking device, which is connected to one end of a shutter slat and pivoted to the end of a lower slat. The locking device consists of a chain, which with its lower end is indirectly or directly secured to said lower shutter slat and which has flat links, which have sharp-edged and/or pointed ends and which are pivoted on axes which extend substantially in the longitudinal direction of the roller slats. When an upward pushing force is exerted on the roller shutter from below, the chain will automatically wedge itself between the two mutually opposite legs of the shutter rail. No locking action will be exerted on the roller shutter.