The U.S. Air Force investigation into the low-altitude explosion of a USAF/McDonnell Douglas Delta 2 booster here Jan. 17 is focusing on one of the vehicle's nine solid-rocket boosters, according to multiple sources familiar with the accident analysis. Several Aviation Week&Space Technology telephoto photographs of the doomed vehicle show what appears to be black smoke erupting from the upper side of the No. 2 solid rocket booster, starting at about 7 sec. before the Delta's ...


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