Airworthiness Directives; The Boeing Company Model 777-200LR and -300ER Series Airplanes Equipped with GE90-100 Series Engines

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We are adopting a new airworthiness directive (AD) for certain Model 777-200LR and -300ER series airplanes equipped with GE90-100 series engines. This AD requires replacing the insulation blanket fasteners of the lower aft cowl of the thrust reverser. This AD also requires inspecting the oil scavenge tube on the turbine rear frame of the engine for damage, and replacement if necessary. This AD results from a determination of insufficient clearance and subsequent interference between the oil scavenge tube on the turbine rear frame of the engine and the bolt on the aft cowl insulation blanket of the thrust reverser. We are issuing this AD to prevent damage and possible puncture of the oil scavenge tube and consequent oil loss, which could result in an in-flight shutdown of the engine.