Airworthiness Directives; General Electric Company GE90-85B Series Turbofan Engines

This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Company GE90-85B series turbofan engines. This action requires removing from service aft mount whiffletrees prior to reaching a new cyclic life limit, and replacing with serviceable parts. This amendment is prompted by a reassessment of the low cycle fatigue capability of the engine mount system due to an increase in engine and propulsion system weight. The actions specified in this AD are intended to prevent aft mount whiffletree failure, which if it occurred with other critical aft mount component failures, could possibly result in an engine mount system failure, and separation of the engine from the aircraft.