Airworthiness Directive · Amendment 39-10046 · General Electric Company GE90 Series Turbofan Engines
General Electric Company GE90 Series Turbofan Engines
General Electric Company (GE) Models GE90-76B, - 77B, -85B, -90B, and -92B turbofan engines, with compressor discharge pressure (CDP) manifolds, Part Numbers (P/Ns) 1686M48G10 or 1686M48G11, installed. These engines are installed on but not limited to Boeing 777 series aircraft.
This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Company (GE) GE90 series turbofan engines. This action requires initial and repetitive borescope inspections of compressor discharge pressure (CDP) manifolds for cracks, and replacement, if necessary, with an improved design CDP manifold. In addition, this AD requires, as terminating action to the inspections, replacement with an improved design CDP manifold. This amendment is prompted by reports of CDP manifold cracking that has resulted in liberated material causing high pressure compressor (HPC) blade damage. The actions specified in this AD are intended to prevent inflight engine power loss or shutdown due to HPC blade damage caused by liberated material from the CDP manifold.
