This paper presents a parametric model-based monitoring technique for detection and confirmation of faults in control surface servo-loops related to the Electrical Flight Control System. It is shown that there exists a direction in the parameter space which is sensitive to the occurrence of the faults on interest. On-line system parameter estimation is combined with an appropriate parametric test decision for robust detection and confirmation of faults. The paper reports on a number of identified practical design considerations identified that should accompany the basic design in order to provide a viable technological solution. The method presented in this paper has reached level 5 on Technological Readiness Level scale under flight Validation & Verification investigations at Airbus. The methodology is considered to be a credible unconventional option to support (not rule out) conventional industrial practices.