Dr.-Ing. Seung is an Aircraft Engineer with emphasis on Aerodynamics, Flight Mechanics, System Technology and Hydraulics. He is also a Public-Funding Manager for Aeronautics Research Programs of the German Federal Ministry for Economic Affairs and Energy.

Introduction.- Topics and arrangement of this report.- Occasion for investigation, brief description of the occurrence.- Appraisal and fundamental contemplation for a pressure controlling servo valve.- Existence of a self-induced fault of a two stage servo valve - Hypothesis.- Experimental investigation - Test execution and results.- Reconstruction of the entire fault working mechanism - interim conclusion.- Additional reflections / Supplementation of contemplation.- Conclusion.