The A4D-3 was a 1957 proposal for an all-weather attack version of the Skyhawk
powered by an 8500 lb.s.t. Pratt & Whitney J52-P-2 turbojet. Four developmental aircraft were ordered,
but the project was cancelled in favor of the A4D-2N, which was a more straightforward all-weather
adaptation of the Skyhawk and was hence less expensive.
McDonnell Douglas Aircraft Since 1920, Vol 1, Rene J. Francillon, Naval Institute
American Combat Planes, 3rd Edition, Ray Wagner, Doubleday, 1982.
United States Navy Aircraft Since 1911, GordonSwanborough and Peter M. Bowers, Naval Institute Press, 1990.
Douglas A-4 Skyhawk Variant Briefing: Part 1, Harry S. Gann, Wings of Fame, Vol 4, 1996.