The Fairey Gannet was first flown on September 19, 1949 and was designed as a carrier-based anti-submarine and airborne early warning aircraft. This mid-wing monoplane had a double turboprop engine with two contra-rotating propellers and was crewed by a pilot and two aerial observers. On June 19, 1950 it became the first turboprop aircraft to make a carrier deck landing when pilot G. Callingham touched down on the HMS Illustrious. In 1958 the Gannet underwent a major structural redesign, which included the addition of a large radome beneath the fuselage. This Airborne Early Warning variant carried AN/APS-20F radar and required two additional crew members.