The US FAA is adopting a new airworthiness directive (AD) for certain 747-8 and 747-8F series airplanes. This AD was prompted by a report that static strength analysis has shown that the aluminium transmission aft bearing plate assemblies have inadequate structural strength for one or more of the required load cases. This AD requires removing aluminium transmission aft bearing plate assemblies from the flap track and installing titanium transmission aft bearing plate assemblies to the flap track. This AD has been issued to address the unsafe condition on these products. Its effective is December 30, 2016.