On 25 June 1945, the Bureau of Aeronautics asked Douglas Aircraft for a turbine-powered, propeller-driven aircraft. Three proposals were put forth in the next year and a half: the D-557A, to use two General Electric TG-100s in wing nacelles; the D-557B, the same engine, with counter-rotating propellers; and the D-557C, to use the Westinghouse 25D. These were canceled due to engine development difficulties, but BuAer continued to seek an answer to thirsty jets. On 11 June 1947 Douglas received the Navy's letter of intent for a carrier-basedturboprop. The need to operate from Casablanca-class escort carriers dictated the use of a turboprop instead of jet power. While it resembled the AD Skyraider, the A2D was different in a number of unseen ways. The 5,100-equivalent shaft horsepowerAllison XT-40-A2 had more than double the horsepower of the Skyraider's R-3350. The XT40 installation on the Skyshark used contra-rotating propellers to harness all the available power. Wing root thickness decreased, from 17% to 12%, while both the height of the tail and its area grew. Engine-development problems delayed the first flight until 26 May 1950, made at Edwards Air Force Base by George Jansen. Navy test pilot Cdr. Hugh Wood was killed attempting to land the first prototype XA2D-1, BuNo 122988, on 19 December 1950, on its 15th flight. He was unable to check the rate of descent, resulting in a high-impact crash on the runway. Investigation found the starboard power section of the coupled Allison XT40A turboprop engine had failed and did not declutch, allowing the Skyshark to fly on the power of the opposite section, nor did the propellers feather. As the wings' lift disappeared, a fatal sink rate was induced. Additional instrumentation and an automatic decoupler was added to the second prototype, but by the time it was ready to fly on 3 April 1952, sixteen months had passed, and with all-jet designs being developed, the A2D program was essentially dead. Total flight time on the lost airframe was barely 20 hours. Allison failed to deliver a "production" engine until 1953, and while testing an XA2D with that engine, test pilot C. G. "Doc" Livingston pulled out of a dive and was surprised by a loud noise and pitch up. His windscreen was covered with oil and the chase pilot told Livingston that the propellers were gone. The gearbox had failed, but Livingston successfully landed the airplane. The A4D was ready to fly by the summer of 1954, and the escort carriers were being mothballed, so that time had run out for the troubled A2D program. Twelve Skysharks were built, two prototypes and ten pre-production aircraft. Most were scrapped or destroyed in accidents, and only one has survived.
