Transportation safety board beginning four days of hearings . The NTSB is investigating the crash that killed a passenger and injured more than 100 others on July 6 in Schoharie, New York. A fourth recommendation would require medical flight operators to follow federal regulations regarding their flights . Nine air ambulance crashes killed 35 people during one-year period . Board 's 2006 safety recommendations not fully implemented , it says .
Transportation safety board beginning four days of hearings . The NTSB is investigating the crash that killed a passenger and injured more than 100 others on July 6 in Schoharie, New York. Nine air ambulance crashes killed 35 people during one-year period . Board 's 2006 safety recommendations not fully implemented , it says .