March 1957, Flight 411, a Vickers Viscount 701 (G-ALWE, "RMA Discovery"), crashed on approach to Manchester Airport due to a flap failure caused by metal fatigue. All 20 occupants on board died along with two on the ground. A bolt that held the bottom of the number two starboard flap unit broke, causing the aileron to become locked; this led to a loss of control. On 28 September 1957, de Havilland Heron 1B G-AOFY, while operating a flight for the Scottish Air Ambulance Service, crashed on approach to Port Ellen/Glenegedale Airport, Islay, in bad weather. The three occupants, two crew and one nurse (a volunteer from Glasgow's Southern General Hospital) were killed. One of the remaining two Herons was named Sister Jean Kennedy after the nurse; the other after James Young Simpson, a Scottish pioneer in anaesthetics. On 23 October 1957, Vickers Viscount 802 G-AOJA on a flight from Heathrow Airport crashed after overshooting on approach to Belfast Nutts Corner Airport, killing all seven on board; the cause was not determined. On 17 November 1957, Vickers Viscount 802 G-AOHP crashed at Ballerup, Denmark, after the failure of three engines on approach to Copenhagen Airport. Both crew members survived. (There were no passengers on board the aircraft as this was an all-cargo flight.) The cause was a malfunction of the anti-icing system on the aircraft. On 6 February 1958, Flight 609 crashed in a blizzard on its third attempt to take off from an icy runway at the Munich Riem Airport in Germany. On board the plane was the Manchester United football team, along with supporters and journalists. Twenty-three of the 43 passengers died. The accident is known as the "Munich Air Disaster". The charter flight was operated by Airspeed Ambassador 2 G-ALZU, Lord Burleigh. On 28 April 1958, Vickers Viscount 802 G-AORC crashed at Craigie, South Ayrshire on approach to Glasgow Prestwick Airport when the pilot misread the altimeter by a margin of . All five occupants on board survived. On 16 May 1958, Douglas Dakota C.3 G-AGHP crashed at Chatenoy, France while flying in a storm as a result of structural failure, killing the crew of three. On 22 October 1958, Flight 142, a Vickers Viscount 701C (G-ANHC), was struck by an Italian Air Force F-86E Sabre and crashed at Anzio, Italy with the loss of all 31 on board; the F-86 pilot was able to eject and survived.