ÜBERLINGEN MID-AIR COLLISION 2002 It is evening, in the sky over southern Germany. Two commercial aircraft are flying on a collision course: a Russian charter flight from Moscow to Barcelona, and a DHL cargo flight from Bergamo to Brussels. Their courses should be corrected by an air traffic controller in Zurich, but he is doing the job of two controllers, at two different work stations, as his equipment is degraded by ongoing maintenance work. Both planes are equipped with TCAS, an automated warning system that is the last line of defense if air traffic control fails to separate planes soon enough. Less than a minute before the crash, the air traffic controller notices the collision course, and gives the Russian crew a command to descend. Seven seconds later, the automated warning system orders the Russian crew to climb, while ordering the DHL crew to descend. The Russian crew begins to (read more...)