A-4 Skyhawk

The Douglas A-4 Skyhawk is a single-seat, subsonic, carrier-capable light attack aircraft built by the Douglas Aircraft Company and later McDonnell Douglas in the United States (A4D under the US Navy's pre-1962 system). Developed in the early 1950s for the Navy and Marine Corps to replace the piston-engined A-1 Skyraider, it entered service on 1 October 1956 and remained in production until February 1979, with 2,960 built, 555 of them two-seat trainers. It is known for a delta wing small enough to need no folding for carrier stowage, a maximum take-off weight of 11,100 kg (24,500 lb), roughly half the Navy's specification, and for pioneering "buddy" air-to-air refuelling between aircraft of the same type.

Development

Douglas met the Navy's call for a jet Skyraider replacement by minimising size, weight and complexity; the first 500 production aircraft cost an average of $860,000 each against a Navy ceiling of $1 million. The Navy issued the contract on 12 June 1952, the XA4D-1 prototype first flew from Edwards Air Force Base on 22 June 1954, and on 15 October 1955 it set a world speed record over a 500 km closed circuit of 1,119 km/h (695.163 mph); deliveries to VA-72 and VMA-224 began in late 1956.

The 166 A4D-1s (A-4A from 1962) were followed by 542 A4D-2s (A-4B) with in-flight refuelling and provision for the AGM-12 Bullpup, and by 638 A4D-2Ns (A-4C) with the AN/APG-53A radar and the LABS low-altitude bombing system on a 36 kN (8,200 lbf) Wright J65-W-20. The A4D-5 (A-4E, 499 built) switched to the 38 kN (8,500 lbf) Pratt & Whitney J52-P-6A, added two pylons for a total of five, and introduced TACAN and Doppler navigation radar. The A-4F (147 built) followed, and the Marine Corps' A-4M Skyhawk II (158 built) was the final production version; the last A-4 built, in February 1979, was an A-4M for VMA-331.

Design

The A-4 has a low-mounted delta wing of 24 m² (260 sq ft), tricycle undercarriage, a cruciform tail with the horizontal stabiliser above the fuselage, and a single turbojet in the rear fuselage fed by two side intakes. The A-4E is 12.23 m (40 ft 1.5 in) long with a span of 8.38 m (27 ft 6 in), weighs 4,469 kg (9,853 lb) empty, reaches 1,083 km/h (673 mph) at sea level and has a ferry range of 4,063 km (2,525 mi). The spars were machined from a single forging running tip to tip, and the leading-edge slats dropped under gravity and air pressure without actuators; the engine is removed by detaching the aft fuselage, which did away with access doors. The Stewart-Warner AN/APQ-145 mapping and ranging radar was fitted to the A-4F and to some A-4E, N, S and SU aircraft, and the A-4M later received the Hughes AN/ASB-19 Angle Rate Bombing System with a TV and laser spot tracker.

For buddy refuelling, one Skyhawk launched unarmed with a centreline store holding a hose reel and drogue; the strike aircraft, launched with full ordnance and partial fuel, topped off from it through the fixed probe on the starboard side of the nose.

Armament

Internal armament is two 20 mm Colt Mk 12 cannon in the wing roots with 100 rounds per gun (200 on the A-4M and its derivatives); the Israeli A-4H and Argentina's Halcón-upgraded aircraft carried two 30 mm DEFA cannon instead. The centreline pylon and, from the A-4E, four underwing pylons carry up to 3,900 kg (8,500 lb): Mk 80-series unguided bombs, Mk 20 Rockeye II cluster bombs, LAU-10 pods of four 127 mm Zuni rockets, up to four AIM-9 Sidewinders, two AGM-12 Bullpup, AGM-45 Shrike, AGM-62 Walleye or AGM-65 Maverick, and the B43, B57 and B61 nuclear bombs.

Operational History

The Skyhawk was the US Navy's main light-attack aircraft over North Vietnam in the early years of the war and flew some of the first US strikes of the conflict. On 1 May 1967 an A-4C of VA-76 from USS Bon Homme Richard shot down a MiG-17 with an unguided Zuni rocket, the type's only air-to-air kill of the war. In all, 362 A-4s and TA-4Fs were lost to all causes during the war (271 Navy, 91 Marine Corps), 32 of them to surface-to-air missiles and one to a MiG-17. The Navy withdrew the type from front-line attack squadrons between 1967 and 1976 as the A-7 Corsair II arrived; the Marine Corps flew it in regular squadrons until the mid-1980s and in the Reserve until 1994. TA-4Js served as the Navy's jet trainer until the T-45 Goshawk, stripped A-4E/Fs stood in for the MiG-17 at TOPGUN until 1999, and the last Navy Skyhawks, TA-4Js of VC-8 at Roosevelt Roads, retired on 3 May 2003.

Israel, the largest export customer, bought 217 aircraft plus 46 transferred from US units in Operation Nickel Grass; deliveries began in December 1967 and the first combat mission followed on 15 February 1968. The Ayit was the Israeli Air Force's main ground-attack aircraft in the War of Attrition and the Yom Kippur War, when most of its losses were to surface-to-air missiles; the fleet retired on 13 December 2015. Argentina received nearly 130 Skyhawks from 1965 and deployed 48 (26 A-4B, 12 A-4C, 10 A-4Q) in the 1982 Falklands War; armed only with unguided bombs, they sank the Type 42 destroyer Coventry and the Type 21 frigate Ardent and damaged six other ships, two of which, the frigate Antelope and RFA Sir Galahad, were later lost, losing 22 aircraft to all causes, eight of them to Sea Harriers. The Argentine Air Force retired the A-4AR Fightinghawk, 36 of which had been rebuilt from ex-Marine A-4Ms, on 14 May 2026, replaced by the F-16.

Kuwait's A-4KUs struck the invading Iraqi forces from deserted roads; 24 of the 29 remaining escaped to Saudi Arabia and, with escaped Mirage F1s, formed the Free Kuwait Air Force, which flew 1,361 sorties in the liberation of Kuwait; one Skyhawk was lost on 17 January 1991. Australia flew 20 A-4Gs from HMAS Melbourne from 1967 to 1984 and sold the survivors to New Zealand, which retired its Kahu-upgraded A-4Ks in 2001; Indonesia, Malaysia and Singapore also flew the type. Brazil bought 20 A-4KUs and three TA-4KUs from Kuwait in 1997 and flew them as the AF-1/AF-1A from the carriers Minas Gerais and São Paulo until the latter's decommissioning in February 2017; Embraer was contracted on 14 April 2009 to modernise 12 to the AF-1B/C standard, the first delivered on 27 May 2015. By 2026 Brazil was the sole military operator; the Canadian contractor Top Aces flies A-4N-AAFs as contract aggressors.

Variants

• A-4A/B (A4D-1/-2): First production versions on the Wright J65, 166 and 542 built, the B adding in-flight refuelling and Bullpup provision.
• A-4C (A4D-2N): Night and adverse-weather version with AN/APG-53A radar and LABS, 638 built; 100 were remanufactured as A-4Ls for Reserve squadrons.
• A-4E (A4D-5): First J52-powered version with five pylons, 499 built, many re-engined with the 41 kN (9,300 lbf) J52-P-8.
• A-4F: Refined A-4E with a dorsal avionics hump, wing-top spoilers and nose-wheel steering, 147 built; the J52-P-408 "Super Fox" conversion followed in 1974.
• A-4M Skyhawk II: Marine Corps version with the 50 kN (11,200 lbf) J52-P-408 and enlarged cockpit, 158 built; 117 A-4Ns went to Israel and 30 A-4KUs to Kuwait.
• TA-4F/TA-4J: Two-seat conversion trainer (241 built) and dedicated trainer without combat equipment (277 built new).
• A-4AR Fightinghawk: 36 ex-Marine A-4Ms rebuilt by Lockheed Martin for Argentina in the late 1990s, retired in May 2026.