three of four attachment points connected. Wreckage markings indicated that the bolt had been present at one point but had fallen out, resulting in progressive fatigue cracking. The NTSB requested immediate action from the US FAA and Transport Canada in the form of an urgent airworthiness directive. Specifications (Bell 407) See also References Further reading (El Chapo bought a Bell 407 helicopter on the advice of his personal pilot.) External links Bell 407GXP page on BellHelicopter.com site 407 1990s United States helicopters 1990s United States civil utility aircraft 1990s Canadian helicopters 1990s Canadian civil utility aircraft Single-turbine helicopters Aircraft first flown in 1995