De NTSB heeft een bulletin uitgegeven omtrend de crashes met Zodiac CH-601XL toestellen. Zie: http://www.ntsb.gov/Pressrel/2009/090414a.html

Dit betreft onder andere het toestel type wat in september 2008 bij Hoorn gecrashed is, waarbij de twee inzittenden om het leven zijn gekomen.

Uit het bulletin:

NTSB ASKS FAA TO ‘PROHIBIT FURTHER FLIGHT’ OF LIGHT SPORT AIRPLANE TIED TO IN-FLIGHT BREAKUPS

Washington, DC - The National Transportation Safety Board today issued an urgent safety recommendation to the Federal Aviation Administration (FAA) in which it asked the agency to prohibit further flight of a type of a small airplane that has been involved in six in-flight structural breakups since 2006.

The recommendations apply to the Zodiac CH-601XL, a low-wing, fixed-gear, single- engine, two-seat general aviation airplane designed by Zenair, Inc. In its urgent safety recommendation, the Board cited four accidents in the United States and two in Europe in which the CH-601XL broke up in-flight killing a total of ten people. Aerodynamic flutter - a phenomenon in which the control surfaces of the airplane can suddenly vibrate, and if unmitigated, can lead to catastrophic structural failure - is suspected in all of the accidents.