AD 2013-12-07
Effective 08/01/2013 · Published 06/27/2013
Airworthiness Directives; Bell Helicopter Textron Canada Helicopters
Summary
We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Canada (BHTC) Model 407 helicopters with certain tailboom assemblies installed. This AD requires, at specified intervals, inspecting the tailboom assembly for a crack, loose rivet, or other damage. This AD was prompted by a stress analysis of the tailboom skin that revealed that high-stress-concentration areas are susceptible to skin crac…