This paper presents a robust parametric test dedicated to control surface runaway (a.k.a. hard-over) detection, jointly developed by the University of Bordeaux and Airbus Operations S.A.S. A robust Recursive Least-Square (RLS) algorithm allows for estimating the parameters of an appropriate parametric model structure of the control surface servo-loop. It has been shown that there exits one parametric direction which is sensitive to faults to be detected. The hardover fault is detected and confirmed by means of a suitable decision test in the parametric space, the so-called CR2 (two confidence regions) test. This paper reminds in more details the chosen approach while insisting on practical constraints when dealing with implementation in real-time systems like the Flight Control Computer. On-going results obtained from a Verification & Validation (V&V) campaign are presented.