The Douglas A4D-2N (after 1962 A-4C) prototype, BuNo 145062. The A4D-2N was equipped with an AN/APG-53A radar in a lenghtened nose (22 cm). In addition, it was provided with an angle of attack indicator system, a Low Altitude Bombing System (LABS), an autopilot, an all-attitude indicating gyro, and an improved Escapac 1A-1 ejector seat. The windshield was provided with a wiper, and the cockpit layout was revised. It The A4D-2N was initially powered by the 7000 lb.s.t J65-W-16A turbojet, but many later received the J65-W-20 with a takeoff rating of 8400 lb.s.t. The first flight was on 21 August 1958, 638 A4D-2Ns were built, more than any other A-4 variant.
USN
1958
U.S. Navy Naval Aviation News January 1959 <a rel="nofollow" class="external autonumber" href="http://www.history.navy.mil/nan/backissues/1950s/1959/Jan59.pdf">[1]</a>