OSHKOSH, Wis. (AP) -- The National Transportation Safety Board is studying what causes accidents on experimental airplanes and how to make them safer.
NTSB Chairman Deborah Hersman is visiting the Experimental Aircraft Association's convention, AirVenture, in Oshkosh through Friday.
She says the number of people owning experimental aircrafts is growing and it's a good time to look at their safety.
The study will look at past accidents, manufacturers, builder assistance programs, transition training for pilot-builders, flight tests, certification requirements and maintenance.
She says the EAA is helping by surveying members and they've already gathered 4,000 responses this week.
The study is expected to done by the fall of 2012, when Hersman expects to have a public hearing about the findings.
EAA AirVenture in Oshkosh runs through Sunday.
More snow, freezing rain, sleet, and wind on the way.
1908 Grand Avenue, Wausau, WI 54403
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