1994 Mull of Kintyre Chinook crash

On 2 June 1994, a Chinook helicopter of the Royal Air Force (RAF), serial number ZD576, crashed on the Mull of Kintyre, Scotland, in foggy conditions. The crash resulted in the deaths of all twenty-five passengers and four crew on board. Among the passengers were almost all the United Kingdom's senior Northern Ireland intelligence experts. The accident is the RAF's fourth-worst peacetime disaster.

In 1995, an RAF board of inquiry ruled that it was impossible to establish the exact cause of the accident. This ruling was overturned by two senior reviewing officers, who stated that the pilots were guilty of gross negligence for flying too fast and too low in thick fog. This finding proved to be controversial, especially in light of irregularities and technical issues surrounding the then-new Chinook HC2 variant which were uncovered, and in light of technical problems with the specific airframe involved in the weeks leading up to the crash. A Parliamentary inquiry conducted in 2001 found the previous verdict of gross negligence on the part of the crew to be 'unjustified'. In 2011, an independent review of the crash cleared the crew of negligence and accepted that the RAF had falsely declared compliance with regulations in relation to the aircraft's authority to fly.

Crash

Earlier on 2 June 1994, the helicopter and crew had carried out a trooping flight, as it was considered to be safer for British troops to fly around in certain parts of Northern Ireland at the time due to the threat posed by Provisional IRA attacks. This mission was safely accomplished and they returned to RAF Aldergrove (outside Belfast, Northern Ireland) at 15:20. They took off for Inverness at 17:42. Weather en route was forecast to be clear except in the Mull of Kintyre area. The crew made contact with military air traffic control (ATC) in Scotland at 17:55.

Around 18:00, Chinook ZD576 flew into a hillside in dense fog. The pilots were Flight Lieutenants Jonathan Tapper, 28, and Richard Cook, 30, both United Kingdom Special Forces pilots. There were two other crew. The helicopter was carrying 25 British intelligence experts from MI5, the Royal Ulster Constabulary and the British Army, from Aldergrove to attend a conference at Fort George (near Inverness) in Scotland. At the time of the accident, Air Chief Marshal Sir William Wratten called it "the largest peacetime tragedy the RAF had suffered".

In the immediate aftermath of the accident, one commentator stated that the loss of so many top level Northern Ireland intelligence officers in one stroke was a huge blow to the John Major government, "temporarily confounding" its campaign against the IRA. That the crash killed so many British intelligence experts, without any witnesses in the foggy conditions, led to considerable speculation and conspiracy theories being devised regarding the potential of a cover-up. Among these were accusations that wake turbulence from a top-secret hypersonic US aircraft had been responsible for the crash, while another postulated that it was a deliberate assassination of the intelligence operatives on board in order to facilitate negotiations with republican factions during the then on-going Northern Ireland peace process.