over the Grand Canyon in Arizona, United States. All five people on board are killed, as are all twenty people on board the de Havilland Twin Otter that it collided with. 6 November – Boeing 234LR Chinook G-BWFC of British International Helicopters suffers a mechanical failure. The aircraft ditches at sea off Sumburgh Airport, Shetland Islands, killing 45 of the 47 people on board. 1988 13 July – Sikorsky S-61N G-BEID of British International Helicopters suffers an engine fire and ditches into the North Sea off the Shetland Islands. All 21 people on board are rescued. 1990 27 August – A Bell 206 helicopter crashes into the side of a ski slope in Elkhorn, Wisconsin, killing all five people on board including Stevie Ray Vaughan. 1991 4 April – A Bell 412 and Piper Aerostar collide in mid-air in a suburb of Philadelphia, Pennsylvania. All five people on both aircraft, including United States senator John Heinz, along with two children on the ground, are killed. 25 October – A Bell 206 crashes into a high-voltage transmission tower near Vallejo, California, during bad weather. All three on board are killed, including Bill Graham. 20 November – A Mil Mi-8 belonging to the Azerbaijani Government is shot down by the Armenian military. It crashes near Karakend. All 22 people on board are killed. 1992 28 January – An Azerbaijani Mil Mi-8 is shot down near Shusha by Armenian forces. All 44 people on board are killed. 1993 26 November – Aérospatiale AS 355 F1 ZK-HIT of the New Zealand Police collides in mid-air with Piper Archer ZK-ENX over Auckland. Both aircraft crash, killing all four people on board. 1994 2 June – Boeing Chinook HC2 ZD576 of the Royal Air Force crashes on the Mull of Kintyre, Argyll. All 29 people on board are killed. 1995 19 January – Aérospatiale AS332 Super Puma G-TIGK, operating Bristow Flight 56C is struck by lightning and ditches in the North Sea off the coast of Aberdeenshire. All eighteen people on board survive. 1997 4 February – Two Sikorsky S-65C-3 Yas'ur 2000s of the Israeli Air Force collide in mid-air over She'ar Yashuv and crash. All 73 people on board the two aircraft are killed. 8 September – Eurocopter AS332L Super Puma LN-OPG operating Helikopter Service Flight 451 suffers a mechanical failure and crashes into the Norwegian Sea. All twelve people on board are killed. 2001