The New York Times, "Brazil Air Force Cites Faults and Confusion in Fatal Gol Airlines Flight 1907 Crash"

          Brazilian Air Force officials on Thursday identified what they said were equipment breakdowns and confusion that probably contributed to the apparent collision of two jets over the Amazon a week ago. Investigators still have not determined how three systems failed: a nearly new, top-notch air traffic control network and an anticollision system on each of the planes.
          The crash killed everyone on the larger of the two planes, a Boeing 737. Its operator, Gol Linhas Aéreas Inteligentes, said Thursday that it had found an error in its passenger count, and lowered the toll to 154 from 155. The smaller plane, though damaged, was able to land.
          For some period before the accident, Brazilian air traffic controllers were unable to speak to the smaller plane, a new Embraer Legacy being flown to the United States, and were unable to gauge its altitude by radar, according to Brazilian officials. Technical experts said that a single electronic failure on the Legacy might have rendered the jet invisible on radar to the other plane, a new Boeing 737, as well as interfered with the Legacy’s ability to pick up the Boeing on its own radar.

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