Abstract: A system for automatic or auto pilot controlled landing of air vehicle (2) with an undercarriage (10) with a substantially plane lower side, at a stationary or mobile landing place is described. The system is primarily characterized in that the landing plate is settable after two axes in roll and pitch, by a set mean controlled in relationship to the air vehicle and the horizontal plane. The air vehicle (2) and the landing plate (3) are provided with transmitter and receiver which define and communicate the mutual distance and the relative angles between the landing plate (3) and the undercarriage (10). Said set means is arranged to set said two axes such that the landing plate (3) will be substantially parallel to the lower side of the undercarriage (10).