Ice section is using the new Basler BT-67 research aircrafts, POLAR 5 and POLAR 6. The aircrafts are based on the vintage DC-3 airframe, and are rebuilt and modernized by Basler Turbo Conversions, LLC (Oshkosh [...] 2011 (Photo: Alfred Wegener Institut) Schematic of sea-ice thickness surveys with an EM-Bird using a Basler BT-67 research aircraft (Graphic: Alfred Wegener Institut)