Abstract: A piloting aid system for landing an aircraft in either normal or adverse weather conditions is disclosed. The system applies a laser scanning process for determining and correcting the aircraft's position with respect to the commanded landing trajectory and for determining the aircraft's speed, altitude, and distance from the runway. The system provides the possibility to direct the aircraft exactly towards the runway longitudinal axis and to level the aircraft exactly parallel to the runway plane all along the landing trajectory and, consequently, to effect a safe landing under visibility conditions which would otherwise prevent landing.