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TOPIC: Impact Speed confusion

Impact Speed confusion 24 Feb 2010 16:15 #473

  • stefanlebkon
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September 15, 2001-February 19, 2002: Significant Contradictions Given in Accounts of Flight 77’s Impact Speed

After Flight 77’s flight data recorder is recovered from the Pentagon wreckage (see September 14, 2001), Fox News reports that investigators say they are getting “good, solid readings” from it. According to this data, “the plane was going 345 miles per hour when it crashed.” [Fox News, 9/15/2001] Firefighters involved in the Pentagon recovery effort are also told the flight data recorder showed Flight 77 was traveling at 345 mph when it hit the Pentagon. [Washington Post, 9/19/2001] However, days later, CBS News reports that it has seen “new radar evidence” pertaining to Flight 77, and quotes unnamed sources describing the plane’s descent toward the Pentagon. CBS says the aircraft had “plowed into the Pentagon at 460 mph.” [CBS News, 9/21/2001] But when the National Transportation Safety Board (NTSB) publishes its “Flight Path Study” for Flight 77 in February 2002, this gives a significantly higher speed. The NTSB study is “based on information obtained from various sources of recorded radar of the subject aircraft,” along with “information from the flight data recorder.” It states, “The airplane accelerated to approximately 460 knots (530 miles per hour) at impact with the Pentagon.” [National Transportation Safety Board, 2/19/2002, pp. 2 pdf file] The 9/11 Commission will later accept this figure in its final report. [9/11 Commission, 7/24/2004, pp. 10 and 455] Yet this is 185 mph faster than the speed earlier claimed to have been revealed by the flight data recorder. The reason for this discrepancy is unknown. All of these alleged speeds are above the Federal Aviation Administration’s speed limit of 287.5 mph for aircraft flying below 10,000 feet. [Milwaukee Journal Sentinel, 2/24/2002]
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