THE T7 WAS A DUAL CONTROL VERSION OF THE AOP6, POWERED BY A 145 HP DE HAVILLAND GYPSY MAJOR V11 ENGINE. 2 AUSTER T7S [WE600 AND WE563] WERE SPECIALLY MODIFIED FOR DR. VIVIAN FUCH’S 1955 TRANS-ANTARTIC EXPEDITION. MODIFICATIONS INCLUDED SKIS OR FLOATS IN PLACE OF MAIN WHEELS, EXTRA NAVIGATION EQUIPMENT AND COLD WEATHER GEAR.