Safety arrangement for aircraft and method for determining type of the landing surface for an aircraft

A safety arrangement for an aircraft, especially for amphibious aircraft, said safety arrangement being configured for determining a type of landing surface, characterized in that the arrangement comprises:

• two transceivers (301, 302),
• where the first transceiver (301) is configured to operate on first electromagnetic wavelength,
• where the second transceiver (302) is configured to operate on second electromagnetic wavelength differing from said first wavelength, and
• where said transceivers (301, 302) are configured to transmit said electromagnetic wavelengths essentially towards said landing surface and at least one of them is configured to receive the reflections of said electromagnetic wavelengths,
• determining means for determining the type of the landing surface based on the properties of said two electromagnetic wavelengths when reflected from said landing surface, and for outputting a signal indicating the type of the determined landing surface.