On 30 April 1990, a Royal Air Force Avro Shackleton AEW Mk II aircraft, of No. 8 Squadron RAF, based at RAF Lossiemouth, crashed into a hill on the Isle of Harris whilst attempting to land at RAF Benbecula. All ten crew on board died in the crash, which included the wing commander who was in charge of No. 8 Squadron at the time. The Shackleton was the last of the fleet to be involved in a fatal accident, and the type was withdrawn from RAF service in 1991. A Board of Inquiry (BoI) later determined the accident as a controlled flight into terrain, but could not ascertain as to why.