Black Buck Five was flown by McDougall with Montgomery reprising his role flying the reserve aircraft. This was the first completed anti-radar mission equipped with Shrike missiles. The main target was a Westinghouse AN/TPS-43 long-range 3D radar that the Argentine Air Force deployed during April to guard the airspace surrounding the Falkland Islands. The warning that this radar gave enabled the Argentine defenders to conceal mobile Exocet missile launchers. It also gave Argentine Hercules transports the warning they needed to continue using the runway at Stanley. An attack on the radar with Shrike missiles could only succeed if the targeted radar continued transmitting until struck, so a Sea Harrier raid was staged to coincide with the attack to force the defenders to turn on the radar. At 0845Z two Shrikes were launched at it. The first missile impacted 10 to 15 yards (9.1 to 13.7 m) from the target, causing minor blast damage, but not disabling the radar. The second missile missed by a greater margin.
Black Buck Six was flown on 3 June by McDougall, whose Vulcan was now armed with four Shrike missiles instead of just two. Montgomery again flew the reserve aircraft. McDougall loitered over the target for 40 minutes in a vain effort to engage the AN/TPS-43, which was not switched on. Finally, the crew fired two of the four Shrikes, which destroyed a Skyguard fire-control radar of the Argentine Army's 601 Anti-Aircraft Battalion, killing four radar operators.
On its return flight McDougall was forced to divert to Rio de Janeiro after his in-flight refuelling probe broke. One of the missiles he was carrying was ditched into the ocean to reduce drag, but the other remained stuck on the pylon and could not be released. Sensitive documents containing classified information were jettisoned into the sea via the crew hatch, and a "Mayday" signal was sent. Two Northrop F-5E Tiger II fighters from 2° Esquadrão do 1° Grupo de Aviação de Caça of the Brazilian Air Force were scrambled from Santa Cruz Airfield and intercepted the Vulcan. The aircraft was cleared to land at Galeão Airport by Brazilian authorities with less than 2,000 pounds (910 kg) of fuel remaining, not enough to complete a circuit of the airport. This was a potentially embarrassing international incident, as it revealed that the United States had supplied the British with Shrike missiles. British diplomats negotiated for the release of the Vulcan and its crew, who were interned at Galeão Air Force Base. A deal was struck on 4 June under which they would be released in exchange for spare parts for Westland Lynx helicopters. Brazil came under pressure from Argentina, and the United States agreed to intervene to preserve the secrets of the Shrike missile. The crew and aircraft were permitted to fly to Ascension on 10 June. A new refuelling probe was fitted there, and the aircraft flew back to Waddington on 13 June. The remaining Shrike missile remained in Brazil.
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