Coggle requires JavaScript to display documents.
WHAT HAPPENED: ((The Boeing B757-200 (DHL) on route to Brussels (Belgium)…
WHAT HAPPENED: ((The Boeing B757-200 (DHL) on route to Brussels (Belgium) from Bergamo (Italy) on a heading of 004 degrees at FL 260.), ((The Tupolev- TU154 (Bashkirian Airlines) on route to Barcelona (Spain) from Mosco(Russia) on a heading of 254 degrees at FL 360.)), (The Tupolev changes course twice in the last minute to be on a heading of 274 degrees.), (Both aircraft equipped with the Traffic Collision and Avoidance System (TCAS).), (Trajectory of both planes puts them on a collision course at 90-degree angle relative to each other.), (German and Swiss agreement allows Zurich Area Control Center (ACC) to have control of this airspace and both of the flights. This puts Peter Nielson in charge at Zurich ATC.), (ATC in Karlsruhe attempts to call Nielson in Zurich but cannot get through and international air traffic control rules prevent German ATC from contacting pilot directly.), (Air Traffic Control Center (ATC) Karlsruhe in Germany notices the danger), (((Russian pilots observe DHL plane on the screen of TCAS anti-collision computer.))), ((((Peter Nielson focus is on getting another plane down, Airbus 1135.)))), (DHL crew not alerted of collision course.), ((TCAS warns Russian plane that other plane is too close.)), (At the same moment TCAS in the DHL plane now picks up the Russian plane. TCAS tells DHL plane to descend), (Peter Nielson finally notices on his screen what is happening and the danger of collision.), ((Peter Nielson informs the Russian plane to descend to flight level 350, captain disengages autopilot and begins to descend and at the same time TCAS tells them to climb.)), (The Russian plane expedites descent.), (Peter Nielson thinks he has avoided a collision, but he does not know the DHL has descended on the instructions from their TCAS.), (DHL attempts to contact ATC (Peter Nielson) to inform him of their descent. Peter cannot hear this.), (Russian plane continues to descend (ATC Instructions) instead of climbing like TCAS is instructing it to do.), (COLLISION OCCURS), (Tail of the DHL clips the belly of the Tupolev TU 154 and rips it in half, pilots lose consciousness. DHL continues for another 2 minutes and crashes 4 miles from impact.), (Planes crash north of the city of Urberlingen, Germany. All 71 people died. ), (UBERLINGEN MID AIR DISASTER))