Airworthiness Directive · Amendment 39-10654 · General Electric Company GE90 Series Turbofan Engines
General Electric Company GE90 Series Turbofan Engines
Superseded. A later AD replaced this one: AD 2002-01-27. Comply with the one in force.
General Electric Company (GE) GE90-76B/ -77B/ - 85B/ -90B/ -92B series turbofan engines, with high pressure compressor (HPC) stage 2-6 spools, Part Numbers 350-005-761-0, 350- 005-765-0, 350-005-769-0, 350-005-770-0, or 350-005-771-0, installed. These engines are installed on but not limited to Boeing 777 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 eddy current inspections (ECI) for cracks in the high pressure compressor (HPC) stage 2-6 spool, and, if necessary, replacement with serviceable parts. This amendment is prompted by reports of cracks in the stage 3-4 and stage 4-5 interstage seal teeth and spacer arms. The actions specified in this AD are intended to identify cracks in the HPC stage 2-6 spool, which could result in an uncontained engine failure and damage to the aircraft.
