This work investigates rotorcraft-pilot coupling phenomena in tiltrotor aircraft. A detailed tiltrotor model, representative of the Bell XV-15, has been built. Biomechanical models of the pilot, acting on the power lever and on the center stick, are included in feedback loop to define the Pilot-Vehicle System. Pilot-Assisted Oscillation phenomena are investigated on the overall conversion corridor using Nyquist's criterion. Pilot-in-the-loop analyses demonstrate that a critical parameter is detected in the vertical tail geometry. For an asymmetric deflection of the
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