Airworthiness Directive · Amendment 39-18360 · General Electric Company Turbofan Engines
General Electric Company Turbofan Engines
This AD applies to General Electric Company (GE) GE90-76B, -77B, -85B, -90B, and -94B turbofan engines with high-pressure compressor (HPC) stage 8-10 spool, part number 1694M80G04, installed.
We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) GE90-76B, -77B, -85B, -90B, and -94B turbofan engines. This AD requires performing an eddy current inspection (ECI) or ultrasonic inspection (USI) of the high-pressure compressor (HPC) stage 8-10 spool and removing from service those parts that fail inspection. This AD was prompted by an uncontained failure of the HPC stage 8-10 spool, leading to an airplane fire. We are issuing this AD to prevent failure of the HPC stage 8-10 spool, uncontained rotor release, damage to the engine, and damage to the airplane.
(1) Perform an eddy current inspection or ultrasonic inspection of the stage 8 aft web upper face of the HPC stage 8-10 spool for cracks as follows:
(i) For HPC stage 8-10 spools with serial number (S/N) GWNHC086 or GWNHB875, inspect within 150 cycles-in-service (CIS), after the effective date of this AD.
(ii) For HPC stage 8-10 spools with S/N GWNHC154, GWNHA455, GWNHC153, or GWNHB516, inspect within 300 CIS, after the effective date of this AD.
(2) Remove from service any HPC stage 8-10 spool that fails the inspection required by paragraph (e)(1) of this AD and replace the spool with a spool eligible for installation.
