5 4 and fitting of the new A400M mili- tary transporter-aircraft. However, a reliable source of compressed air is essential during each stage of these production processes. After a detailed air demand analysis (ADA), the first three Kaeser compressors (two CS 121 and a CS 91) were installed in 1997. Dieter Markowiak remem- bers that initial scepticism of the “modern machines” (i.e. rotary screw compressors as opposed to the previously installed

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