The subproject C4 investigates the influence of regeneration-related, geometric variations of turbine blades on the aeroelastic properties of downstream blades. The focus is on the investigation of combined geometric variations. For this purpose, probabilistic approaches are used and tolerance bands are derived, which are used in the regeneration process. Another focus is on wear- and regeneration-related disturbances from upstream modules of the entire engine, which propagate as thermal streaks through the turbine. The goal is to investigate the mixing behavior and the potential to cause blade vibrations.