2013-12-07
FR doc 2013-14857AD 2013-12-07Published 2013-06-27Effective 2013-08-01
Superseded by 2022-23-02
Supersedence is read from the Federal Register text of the newer AD — the FAA publishes no structured field for it — and names only ADs held in our index.
Prompted by a stress analysis of the tailboom skin that revealed that high-stress-concentration areas are susceptible to skin cracking.
Full official abstract
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 cracking. This condition, if not detected, could result in a crack in the tailboom assembly, failure of the tailboom, and subsequent loss of control of the helicopter.