willing to provide such training. A study released in 2012 by the U.S. National Transportation Safety Board concluded that homebuilt aircraft in the U.S. have an accident rate 3–4 times higher than the rest of the general aviation fleet. Almost 10% of homebuilt accidents occurred on the first flight and 9% of accidents occurred in aircraft that were sold were on the new owner's first flight. The study also identified that powerplant failures and loss of control in-flight accidents were much higher than the same rates for certified aircraft. Most nations' aviation regulations require amateur-built aircraft to be physically marked as such (for example in the U.K. "Occupant Warning – This aircraft ... is amateur built." must be displayed), and extra flight testing is usually required before passengers (who are not pilots themselves) can be carried. Culture The largest airshow in the world is the Experimental Aircraft Association's annual EAA AirVenture Oshkosh airshow in Oshkosh, Wisconsin, which takes place in late July and early August. Other annual events are the Sun N' Fun Fly-In, which occurs in the early spring in Lakeland, Florida, and the Northwest EAA Fly-In in Arlington, Washington. These events are called a fly-in as many people fly their homebuilts and other aircraft into the airport hosting the show, often camping there for the duration. Both events last a week. Takeoffs and landings at these shows number in the thousands. See also Aircraft design process Ultralight Special Airworthiness Certificate Kit car References External links Experimental Aircraft Association (EAA) Light Aircraft Association, the representative body in the United Kingdom for amateur aircraft. FAA Advisory Circular 20-27G: Certification and Operation of Amateur-Built Aircraft