Airworthiness Directive · Amendment 39-22170 · Turbine section
General Electric Company Turbofan Engines
This AD applies to General Electric Company (GE) GEnx-2B67/P model turbofan engines with an installed:
(1) Low-pressure turbine rotor (LPTR) stage 4 disk, part number (P/N) 2440M64P01, with serial number (S/N) JHVPD762, JHVPD763, JHVPD764, or JHVPD765; or
(2) LPTR stage 6 disk, P/N 2440M66P01, with S/N JHVVD753 or JHVVD754.
The FAA is adopting a new airworthiness directive (AD) for certain General Electric Company (GE) GEnx-2B67/P model turbofan engines. This AD was prompted by the detection of an iron inclusion in a forging, which may reduce the fatigue life of certain low-pressure turbine rotor (LPTR) stage 4 disks and LPTR stage 6 disks. This AD requires the removal of certain LPTR stage 4 disks and LPTR stage 6 disks from service and replacement with parts eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Before the affected LPTR stage 4 disk exceeds 3,000 cycles since new (CSN), remove the affected LPTR stage 4 disk from service and replace with an LPTR stage 4 disk eligible for installation.
(2) Before the affected LPTR stage 6 disk exceeds 5,000 CSN, remove the affected LPTR stage 6 disk from service and replace with an LPTR stage 6 disk eligible for installation.
(1) For the purpose of this AD, an “LPTR stage 4 disk eligible for installation” is an LPTR stage 4 disk that does not have P/N 2440M64P01, with S/N JHVPD762, JHVPD763, JHVPD764, or JHVPD765.
(2) For the purpose of this AD, an “LPTR stage 6 disk eligible for installation” is an LPTR stage 6 disk that does not have P/N 2440M66P01, with S/N JHVVD753 or JHVVD754.
