The New York Times, "Equipment on Plane in Brazil Collision May Have Been Faulty"

          Brazilian Air Force investigators confirmed Wednesday that the Boeing 737 involved in an apparent midair collision last Friday was visible on radar until the time of the accident. They declined to say whether the other plane, an Embraer executive jet, was also visible, an indication that equipment on the smaller plane to make it visible to the airliner may not have been working.
          The airliner, operated by Gol Linhas Aéreas Inteligentes, crashed in the jungle, killing all 155 aboard. The Brazilian-made Embraer Legacy, being delivered from the factory to a charter company in New York, made an emergency landing.
          If the equipment on the Embraer was not running, that might explain why there was no warning to the airliner, but it would not have affected the ability of anticollision equipment on board the business jet to detect the Boeing and warn its crew. The pilots of the business jet, United States citizens still in Brazil for questioning, testified after the crash that the equipment functioned throughout the flight and that there was no warning of a pending collision, said Anderson Garcia, a police investigator.

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