Airworthiness Directive · Amendment 39-14794 · Boeing Model 777-200 Series Airplanes Equipped with General Electric GE90-94B Engines
Boeing Model 777-200 Series Airplanes Equipped with General Electric GE90-94B Engines
This AD applies to Boeing Model 777-200 series airplanes equipped with General Electric GE90-94B engines; certificated in any category; as identified in Boeing Alert Service Bulletin 777-78A0056, dated April 20, 2006.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 777-200 series airplanes equipped with General Electric GE90-94B engines. This AD requires inspecting to determine the part number of the identification plate of the torque box on the thrust reversers (TRs), and investigative and corrective actions if necessary. This AD results from engine certification testing which revealed that TRs on GE90-94B engines have inner walls that could develop disbonding in the upper bifurcation radii. Disbonding was found in an equivalent inner wall used during the testing. We are issuing this AD to prevent failure of a TR and adjacent components and their consequent separation from the airplane during flight or during a refused takeoff (RTO). These separated components could cause structural damage to the airplane or damage to other airplanes and possible injury to people on the ground. TR failure during a RTO could also cause the engine to produce forward thrust, resulting in asymmetric thrust and possible runway excursion.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 24 months after the effective date of this AD: Do a general visual inspection to determine the part number of the identification plate of the torque box on the TRs, and do all applicable investigative and corrective actions before further flight, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 777-78A0056, dated April 20, 2006. If any discrepancy is found and the service bulletin specifies to contact Boeing for appropriate action: Before further flight, repair the TR using a method approved in accordance with the procedures specified in paragraph (g) of this AD.
Note 1: The Boeing service bulletin refers to Spirit AeroSystems Document MAA7-70023-1, dated November 22, 2005, as an additional source of service information for accomplishing the corrective actions.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
