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The Wichita Eagle, Mike Hutmacher, Associated Press
Firefighters try to put out a fire at Mid-Continent Airport in Wichita, Kan., Thursday. Oct. 30, 2014, shortly after a small plane crashed into the building killing several people including the pilot.

WICHITA, Kan. — The National Transportation Safety Board says six eyewitness have reported that a small plane drifted to the left side of the runway after taking off from a Kansas airport, then made a steep left bank before crashing into a flight training facility.

NTSB investigator Josh Lindberg said Friday that the plane had undergone two maintenance test flights without problems. A cockpit voice recorder and a flight data recorder were on the aircraft, but investigators have not been able to access the crash site yet to recover them.

Lindberg says investigators have not yet been able to get into the 30-foot hazard zone near the building where most of the wreckage is located due to safety concerns.