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The plane is not required to have a flight recorder but it is possible that there are other avionics equipment that will have data that they can examine
Along with NTSB, they are beginning evidence collection and body recovery efforts.
Investigators will look at when the pilot became unresponsive and why aircraft flew the path that it did, he said. They will consider several factors that are routinely examined in such probes including the plane, its engines, weather conditions, pilot qualifications and maintenance records
A preliminary report will be released in 10 days and a final report will be released in one to two years