Smoke alarm systems, in particular for an aircraft, advantageously provide a high degree of safety so as to prevent false alarms. AV data recorded on a pre-recorded tape is output from a reproducing unit of a first digital VCR with protective information indicating whether the copy of the AV data is inhibited or not. The component carrier and the casing defining a cavity therebetween, and the component carrier at least partially defines a process flowpath fluidly communicating with the inlet and the outlet of the casing. The scanned data can then be used to machine a face of the stripper shoe that is the mirror image of the selected pattern. The wall extends between an inside and an outside.