On March 24, 1999, after a four-year investigation, the NTSB issued its probable cause finding for Flight 427.
United States civil aviation incidents are investigated by the National Transportation Safety Board (NTSB).
The National Transportation Safety Board (NTSB) investigation found a gouge in the pipe, probably caused by excavation equipment years earlier which, in combination with brittle pipe material and excessive operating pressures, most likely led to the rupture.
Criticizing the spread of misinformation in regards to the derailment, NTSB Chair Jennifer Homendy urged the public to let the NTSB investigate and stop "adding pain to a community that’s been through enough", adding that if people genuinely wanted to help, the NTSB was hiring.
The National Transportation Safety Board (NTSB) arrived on scene the following day and began an investigation.
The FAA and National Transportation Safety Board (NTSB) immediately began investigations of the accident.
The accident was investigated by the Federal Aviation Administration and the National Transportation Safety Board (NTSB). On September 12, 2016, the NTSB reported their initial findings.
Beverley Drake (born 20 June 1956) is a Guyanese pilot and aviation expert who is an administrator and accident investigation analyst with the United States National Transportation Safety Board (NTSB).
The Federal Aviation Administration and the National Transportation Safety Board (NTSB) led the investigation into what was designated a "major accident" by the NTSB.
Since its creation, the NTSB's primary mission has been "to determine the probable cause of transportation accidents and incidents and to formulate safety recommendations to improve transportation safety (in the USA)".
The NTSB released its report on May 3, 2001. The NTSB investigation determined that the probable cause of the accident was "the pilot's [...] failure to maintain clearance from the other airplane.
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